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Abelmoschus +
Introduced  +
Abelmoschus esculentus +
Illustrated  +, Introduced  +, Weedy  +
Abies amabilis +
Endemic  +
Abies balsamea +
Endemic  +, Illustrated  +
Abies bifolia +
Endemic  +
Abies bracteata +
Conservation concern  +, Endemic  +
Abies concolor +
Illustrated  +
Abies fraseri +
Conservation concern  +, Endemic  +
Abies grandis +
Endemic  +, Illustrated  +
Abies lasiocarpa +
Endemic  +
Abies lowiana +
Endemic  +
Abies magnifica +
Endemic  +
Abies procera +
Endemic  +
Abietinella abietina +
Illustrated  +
Abildgaardia ovata +
Illustrated  +
Abronia alpina +
Conservation concern  +, Endemic  +
Abronia ameliae +
Endemic  +
Abronia ammophila +
Conservation concern  +, Endemic  +
Abronia angustifolia +
Illustrated  +
Abronia argillosa +
Endemic  +
Abronia bigelovii +
Conservation concern  +, Endemic  +, Illustrated  +
Abronia carletonii +
Endemic  +
Abronia elliptica +
Endemic  +, Illustrated  +
Abronia fragrans +
Illustrated  +
Abronia latifolia +
Endemic  +
Abronia macrocarpa +
Conservation concern  +, Endemic  +, Illustrated  +
Abronia mellifera +
Endemic  +
Abronia nana +
Endemic  +
Abronia nana var. covillei +
Endemic  +
Abronia nana var. nana +
Endemic  +
Abronia pogonantha +
Endemic  +, Illustrated  +
Abronia turbinata +
Endemic  +, Illustrated  +
Abronia umbellata var. acutalata +
Endemic  +
Abronia umbellata var. breviflora +
Endemic  +
Abronia villosa +
Illustrated  +
Abronia villosa var. aurita +
Conservation concern  +, Illustrated  +
Abronia villosa var. villosa +
Illustrated  +
Abutilon hirtum +
Introduced  +
Abutilon hypoleucum +
Illustrated  +
Abutilon mollicomum +
Illustrated  +
Abutilon palmeri +
Illustrated  +
Abutilon parishii +
Conservation concern  +
Abutilon theophrasti +
Introduced  +, Weedy  +
Acaena novae-zelandiae +
Illustrated  +, Introduced  +, Weedy  +
Acaena pallida +
Introduced  +
Acaena pinnatifida +
Illustrated  +
Acalypha alopecuroidea +
Introduced  +
Acalypha arvensis +
Introduced  +
Acalypha australis +
Introduced  +
Acalypha californica +
Illustrated  +
Acalypha deamii +
Endemic  +
Acalypha gracilens +
Endemic  +, Illustrated  +, Weedy  +
Acalypha monococca +
Endemic  +
Acalypha neomexicana +
Weedy  +
Acalypha ostryifolia +
Illustrated  +, Weedy  +
Acalypha rhomboidea +
Endemic  +, Illustrated  +, Weedy  +
Acalypha setosa +
Introduced  +
Acalypha virginica +
Endemic  +, Illustrated  +, Weedy  +
Acalypha wilkesiana +
Introduced  +
Acamptopappus shockleyi +
Endemic  +
Acamptopappus sphaerocephalus +
Endemic  +, Illustrated  +
Acamptopappus sphaerocephalus var. hirtellus +
Endemic  +
Acamptopappus sphaerocephalus var. sphaerocephalus +
Endemic  +, Illustrated  +
Acanthocereus tetragonus +
Illustrated  +
Acanthoscyphus parishii +
Endemic  +, Illustrated  +
Acanthoscyphus parishii var. abramsii +
Endemic  +
Acanthoscyphus parishii var. cienegensis +
Endemic  +
Acanthoscyphus parishii var. goodmaniana +
Endemic  +
Acanthoscyphus parishii var. parishii +
Endemic  +, Illustrated  +
Acanthospermum australe +
Illustrated  +, Introduced  +
Acanthospermum hispidum +
Introduced  +
Acanthospermum humile +
Introduced  +
Achillea millefolium +
Illustrated  +
Achillea ptarmica +
Introduced  +
Achlys californica +
Endemic  +
Achlys triphylla +
Endemic  +, Illustrated  +
Achnatherum aridum +
Endemic  +
Achnatherum latiglume +
Endemic  +
Achnatherum lemmonii +
Endemic  +
Achnatherum lemmonii subsp. lemmonii +
Endemic  +
Achnatherum lemmonii subsp. pubescens +
Endemic  +
Achnatherum lettermanii +
Endemic  +
Achnatherum nelsonii subsp. dorei +
Endemic  +
Achnatherum nevadense +
Endemic  +
Achnatherum occidentale +
Endemic  +
Achnatherum occidentale subsp. californicum +
Endemic  +
Achnatherum occidentale subsp. occidentale +
Endemic  +
Achnatherum occidentale subsp. pubescens +
Endemic  +
Achnatherum pinetorum +
Endemic  +
Achnatherum stillmanii +
Endemic  +
Achnatherum thurberianum +
Endemic  +
Achnatherum webberi +
Endemic  +
Achyrachaena mollis +
Illustrated  +
Achyranthes aspera +
Illustrated  +
Achyranthes aspera var. aspera +
Illustrated  +, Introduced  +
Achyranthes aspera var. pubescens +
Illustrated  +
Achyranthes japonica +
Introduced  +
Achyronychia cooperi +
Illustrated  +
Acleisanthes acutifolia +
Illustrated  +
Acleisanthes chenopodioides +
Illustrated  +
Acleisanthes crassifolia +
Conservation concern  +
Acleisanthes diffusa +
Endemic  +, Illustrated  +
Acleisanthes lanceolata +
Illustrated  +
Acleisanthes lanceolata var. lanceolata +
Illustrated  +
Acleisanthes longiflora +
Illustrated  +
Acleisanthes nevadensis +
Endemic  +
Acleisanthes wrightii +
Conservation concern  +
Acmella pusilla +
Introduced  +
Acmella repens +
Illustrated  +
Acoelorraphe wrightii +
Conservation concern  +, Illustrated  +
Aconitum columbianum +
Illustrated  +, W2  +
Aconitum columbianum subsp. columbianum +
Illustrated  +
Aconitum columbianum subsp. viviparum +
Endemic  +, Illustrated  +
Aconitum delphiniifolium +
Illustrated  +
Aconitum maximum +
Illustrated  +
Aconitum maximum subsp. maximum +
Illustrated  +
Aconitum reclinatum +
Endemic  +, Illustrated  +
Aconitum uncinatum +
Endemic  +, Illustrated  +
Aconogonon alaskanum +
Illustrated  +
Aconogonon alaskanum var. alaskanum +
Illustrated  +
Aconogonon alaskanum var. glabrescens +
Endemic  +, Illustrated  +
Aconogonon davisiae +
Endemic  +
Aconogonon davisiae var. davisiae +
Endemic  +
Aconogonon davisiae var. glabrum +
Endemic  +
Aconogonon phytolaccifolium +
Endemic  +
Aconogonon phytolaccifolium var. glabrum +
Endemic  +
Aconogonon phytolaccifolium var. phytolaccifolium +
Endemic  +
Acorus americanus +
Endemic  +, Illustrated  +
Acorus calamus +
Illustrated  +, Introduced  +
Acourtia runcinata +
Illustrated  +
Acrocomia totai +
Illustrated  +, Introduced  +
Acroporium smallii +
Endemic  +, Illustrated  +
Acroptilon repens +
Illustrated  +, Introduced  +
Acrostichum danaeifolium +
Illustrated  +
Actaea pachypoda +
Endemic  +, Illustrated  +
Actaea rubra +
Endemic  +, Illustrated  +, W2  +
Actinostachys pennula +
Illustrated  +
Adelia vaseyi +
Illustrated  +
Adenocaulon bicolor +
Endemic  +, Illustrated  +
Adenophyllum cooperi +
Endemic  +, Illustrated  +
Adenostoma fasciculatum +
Illustrated  +
Adenostoma fasciculatum var. fasciculatum +
Illustrated  +
Adenostoma fasciculatum var. obtusifolium +
Illustrated  +
Adenostoma fasciculatum var. prostratum +
Endemic  +
Adiantum aleuticum +
Illustrated  +
Adiantum capillus-veneris +
Illustrated  +
Adiantum jordanii +
Illustrated  +
Adiantum pedatum +
Illustrated  +
Adiantum tenerum +
Illustrated  +
Adiantum viridimontanum +
Endemic  +
Adlumia fungosa +
Endemic  +, Illustrated  +
Adolphia infesta +
Illustrated  +
Adonis aestivalis +
Illustrated  +, Introduced  +
Adonis annua +
Illustrated  +, Introduced  +, W1  +
Adonis vernalis +
Introduced  +, W1  +
Aegilops crassa +
Introduced  +
Aegilops cylindrica +
Introduced  +
Aegilops triuncialis +
Introduced  +
Aeonium arboreum +
Introduced  +
Aeonium arboreum var. arboreum +
Introduced  +
Aeonium haworthii +
Illustrated  +, Introduced  +
Agalinis aphylla +
Endemic  +, Illustrated  +
Agalinis aspera +
Endemic  +
Agalinis auriculata +
Conservation concern  +, Endemic  +
Agalinis caddoensis +
Conservation concern  +, Endemic  +
Agalinis calycina +
Conservation concern  +
Agalinis decemloba +
Conservation concern  +, Endemic  +
Agalinis densiflora +
Endemic  +
Agalinis divaricata +
Endemic  +, Illustrated  +
Agalinis edwardsiana +
Endemic  +
Agalinis filicaulis +
Endemic  +, Illustrated  +
Agalinis filifolia +
Endemic  +
Agalinis flexicaulis +
Conservation concern  +, Endemic  +
Agalinis gattingeri +
Endemic  +
Agalinis georgiana +
Conservation concern  +, Endemic  +, Illustrated  +
Agalinis heterophylla +
Endemic  +
Agalinis homalantha +
Endemic  +
Agalinis laxa +
Endemic  +, Illustrated  +
Agalinis linifolia +
Endemic  +
Agalinis maritima var. maritima +
Endemic  +
Agalinis navasotensis +
Conservation concern  +, Endemic  +, Illustrated  +
Agalinis neoscotica +
Endemic  +
Agalinis obtusifolia +
Endemic  +, Illustrated  +
Agalinis oligophylla +
Endemic  +, Illustrated  +
Agalinis plukenetii +
Endemic  +
Agalinis pulchella +
Endemic  +, Illustrated  +
Agalinis purpurea +
Endemic  +
Agalinis purpurea var. parviflora +
Endemic  +
Agalinis purpurea var. purpurea +
Endemic  +
Agalinis setacea +
Endemic  +, Illustrated  +
Agalinis skinneriana +
Endemic  +
Agalinis tenella +
Endemic  +, Illustrated  +
Agalinis tenuifolia +
Endemic  +
Agalinis viridis +
Endemic  +
Agarista populifolia +
Endemic  +, Illustrated  +
Agave chrysantha +
Endemic  +
Agave decipiens +
Endemic  +
Agave deserti +
Illustrated  +
Agave deserti var. deserti +
Illustrated  +
Agave deserti var. simplex +
Illustrated  +
Agave desmettiana +
Introduced  +
Agave neglecta +
Conservation concern  +, Endemic  +
Agave parryi +
Illustrated  +
Agave parryi subsp. neomexicana +
Endemic  +
Agave parryi subsp. parryi +
Illustrated  +
Agave parryi var. couesii +
Endemic  +
Agave parryi var. huachucensis +
Illustrated  +
Agave parryi var. parryi +
Illustrated  +
Agave schottii var. treleasei +
Endemic  +
Agave shawii +
Illustrated  +
Agave shawii var. shawii +
Illustrated  +
Agave sisalana +
Introduced  +
Agave toumeyana +
Endemic  +, Illustrated  +
Agave toumeyana var. bella +
Endemic  +, Illustrated  +
Agave toumeyana var. toumeyana +
Endemic  +, Illustrated  +
Agave utahensis +
Endemic  +, Illustrated  +
Agave utahensis subsp. kaibabensis +
Endemic  +
Agave utahensis subsp. utahensis +
Endemic  +, Illustrated  +
Agave utahensis var. eborispina +
Endemic  +
Agave utahensis var. nevadensis +
Endemic  +, Illustrated  +
Agave utahensis var. utahensis +
Endemic  +
Agave weberi +
Introduced  +
Agdestis clematidea +
Illustrated  +
Ageratina adenophora +
Introduced  +
Ageratina altissima +
Endemic  +, Illustrated  +
Ageratina altissima var. altissima +
Endemic  +, Illustrated  +
Ageratina altissima var. roanensis +
Endemic  +
Ageratina aromatica +
Endemic  +
Ageratina jucunda +
Endemic  +
Ageratina luciae-brauniae +
Endemic  +
Ageratina occidentalis +
Endemic  +, Illustrated  +
Ageratina shastensis +
Endemic  +
Ageratum conyzoides +
Introduced  +
Ageratum corymbosum +
Illustrated  +
Ageratum houstonianum +
Introduced  +
Agnorhiza bolanderi +
Endemic  +, Illustrated  +
Agnorhiza elata +
Endemic  +
Agnorhiza invenusta +
Endemic  +
Agnorhiza reticulata +
Conservation concern  +, Endemic  +
Agoseris apargioides +
Endemic  +
Agoseris apargioides var. apargioides +
Endemic  +
Agoseris apargioides var. eastwoodiae +
Endemic  +
Agoseris apargioides var. maritima +
Endemic  +
Agoseris aurantiaca +
Endemic  +, Illustrated  +
Agoseris aurantiaca var. aurantiaca +
Endemic  +, Illustrated  +
Agoseris aurantiaca var. purpurea +
Endemic  +, Illustrated  +
Agoseris glauca +
Endemic  +, Illustrated  +
Agoseris glauca var. dasycephala +
Endemic  +, Illustrated  +
Agoseris glauca var. glauca +
Endemic  +, Illustrated  +
Agoseris grandiflora +
Endemic  +
Agoseris grandiflora var. grandiflora +
Endemic  +
Agoseris grandiflora var. leptophylla +
Endemic  +
Agoseris heterophylla var. cryptopleura +
Endemic  +
Agoseris hirsuta +
Endemic  +
Agoseris parviflora +
Endemic  +
Agrimonia gryposepala +
Illustrated  +
Agrimonia incisa +
Endemic  +, Illustrated  +
Agrimonia microcarpa +
Conservation concern  +, Endemic  +, Illustrated  +
Agrimonia parviflora +
Illustrated  +
Agrimonia pubescens +
Endemic  +, Illustrated  +
Agrimonia rostellata +
Endemic  +, Illustrated  +
Agrimonia striata +
Illustrated  +
Agropyron cristatum +
Introduced  +
Agrostemma githago +
Illustrated  +, Introduced  +, Weedy  +
Agrostemma githago var. githago +
Illustrated  +, Introduced  +, Weedy  +
Agrostis blasdalei +
Endemic  +
Agrostis canina +
Introduced  +
Agrostis capillaris +
Introduced  +
Agrostis densiflora +
Endemic  +
Agrostis gigantea +
Introduced  +
Agrostis hallii +
Endemic  +
Agrostis hendersonii +
Endemic  +
Agrostis hooveri +
Endemic  +
Agrostis howellii +
Endemic  +
Agrostis oregonensis +
Endemic  +
Agrostis rossiae +
Endemic  +
Agrostis variabilis +
Endemic  +
Aira caryophyllea +
Introduced  +
Aira caryophyllea var. capillaris +
Introduced  +
Aira caryophyllea var. caryophyllea +
Introduced  +
Aira caryophyllea var. cupaniana +
Introduced  +
Aira praecox +
Introduced  +
Akebia quinata +
Illustrated  +, Introduced  +
Alcea +
Introduced  +
Alcea rosea +
Illustrated  +, Introduced  +, Weedy  +
Alcea rugosa +
Introduced  +
Alchemilla filicaulis +
Illustrated  +
Alchemilla filicaulis subsp. filicaulis +
Illustrated  +
Alchemilla filicaulis subsp. vestita +
Illustrated  +
Alchemilla glabra +
Introduced  +
Alchemilla glaucescens +
Introduced  +
Alchemilla micans +
Introduced  +
Alchemilla mollis +
Introduced  +
Alchemilla monticola +
Introduced  +
Alchemilla subcrenata +
Introduced  +
Alchemilla venosa +
Introduced  +
Alchemilla xanthochlora +
Introduced  +
Aletris aurea +
Endemic  +
Aletris bracteata +
Conservation concern  +
Aletris farinosa +
Endemic  +, Illustrated  +
Aletris lutea +
Endemic  +
Aletris obovata +
Endemic  +
Alisma lanceolatum +
Introduced  +
Alisma plantago-aquatica +
Introduced  +
Alisma subcordatum +
Illustrated  +
Alisma triviale +
Illustrated  +
Alkekengi +
Introduced  +
Alkekengi officinarum +
Illustrated  +, Introduced  +, Weedy  +
Allamanda +
Introduced  +
Allamanda cathartica +
Illustrated  +, Introduced  +
Allenrolfea occidentalis +
Illustrated  +
Alliaria petiolata +
Illustrated  +, Introduced  +, Weedy  +
Allionia choisyi +
Illustrated  +
Allionia incarnata +
Illustrated  +
Allionia incarnata var. incarnata +
Illustrated  +
Allionia incarnata var. villosa +
Illustrated  +
Allium aaseae +
Endemic  +, Illustrated  +
Allium abramsii +
Endemic  +
Allium acuminatum +
Endemic  +, Illustrated  +
Allium ampeloprasum +
Introduced  +
Allium amplectens +
Endemic  +, W2  +
Allium anceps +
Endemic  +
Allium atrorubens +
Endemic  +
Allium atrorubens var. atrorubens +
Endemic  +
Allium atrorubens var. cristatum +
Endemic  +
Allium bigelovii +
Endemic  +
Allium bisceptrum +
Endemic  +
Allium bolanderi +
Endemic  +
Allium bolanderi var. bolanderi +
Endemic  +
Allium bolanderi var. mirabile +
Endemic  +
Allium brandegeei +
Endemic  +, Illustrated  +
Allium brevistylum +
Endemic  +, Illustrated  +
Allium burlewii +
Endemic  +, Illustrated  +
Allium campanulatum +
Endemic  +
Allium canadense +
Endemic  +, Illustrated  +, W1  +, …
Allium canadense var. canadense +
Endemic  +, Illustrated  +
Allium canadense var. ecristatum +
Endemic  +
Allium canadense var. fraseri +
Endemic  +
Allium canadense var. hyacinthoides +
Endemic  +
Allium canadense var. lavendulare +
Endemic  +, Illustrated  +, W1  +, …
Allium canadense var. mobilense +
Endemic  +, Illustrated  +
Allium cernuum +
Illustrated  +
Allium columbianum +
Endemic  +
Allium constrictum +
Conservation concern  +, Endemic  +
Allium coryi +
Endemic  +
Allium cratericola +
Endemic  +, Illustrated  +
Allium crenulatum +
Endemic  +
Allium crispum +
Endemic  +, Illustrated  +
Allium cuthbertii +
Endemic  +
Allium denticulatum +
Endemic  +
Allium diabolense +
Endemic  +
Allium dichlamydeum +
Endemic  +
Allium dictuon +
Conservation concern  +, Endemic  +, Illustrated  +
Allium douglasii +
Endemic  +
Allium drummondii +
Illustrated  +
Allium elmendorfii +
Conservation concern  +, Endemic  +
Allium falcifolium +
Endemic  +, Illustrated  +
Allium fibrillum +
Endemic  +
Allium fimbriatum var. mohavense +
Endemic  +
Allium fimbriatum var. purdyi +
Endemic  +
Allium fistulosum +
Introduced  +
Allium geyeri +
Endemic  +, Illustrated  +, W2  +
Allium geyeri var. geyeri +
Endemic  +, Illustrated  +
Allium geyeri var. tenerum +
Endemic  +, Illustrated  +
Allium gooddingii +
Endemic  +
Allium haematochiton +
Illustrated  +
Allium hickmanii +
Conservation concern  +, Endemic  +, Illustrated  +
Allium hoffmanii +
Endemic  +
Allium howellii +
Endemic  +, Illustrated  +
Allium howellii var. clokeyi +
Endemic  +, Illustrated  +
Allium howellii var. howellii +
Endemic  +
Allium howellii var. sanbenitense +
Endemic  +
Allium hyalinum +
Endemic  +, Illustrated  +
Allium jepsonii +
Conservation concern  +, Endemic  +, Illustrated  +
Allium lacunosum +
Endemic  +
Allium lacunosum var. davisiae +
Endemic  +
Allium lacunosum var. kernensis +
Endemic  +
Allium lacunosum var. lacunosum +
Endemic  +
Allium lacunosum var. micranthum +
Endemic  +
Allium lemmonii +
Endemic  +, Illustrated  +
Allium macropetalum +
Endemic  +
Allium macrum +
Endemic  +
Allium madidum +
Endemic  +
Allium membranaceum +
Endemic  +, Illustrated  +
Allium monticola +
Endemic  +
Allium munzii +
Conservation concern  +, Endemic  +, Illustrated  +
Allium neapolitanum +
Introduced  +, W2  +
Allium nevadense +
Endemic  +, Illustrated  +
Allium nevii +
Endemic  +, Illustrated  +
Allium nigrum +
Introduced  +
Allium obtusum +
Endemic  +
Allium obtusum var. conspicuum +
Endemic  +
Allium obtusum var. obtusum +
Endemic  +
Allium oleraceum +
Introduced  +
Allium paniculatum var. paniculatum +
Introduced  +, W2  +
Allium parishii +
Endemic  +
Allium parvum +
Endemic  +
Allium passeyi +
Conservation concern  +, Endemic  +
Allium peninsulare var. franciscanum +
Endemic  +
Allium perdulce +
Endemic  +
Allium perdulce var. perdulce +
Endemic  +
Allium perdulce var. sperryi +
Endemic  +
Allium platycaule +
Endemic  +, Illustrated  +
Allium punctum +
Endemic  +, Illustrated  +
Allium robinsonii +
Endemic  +
Allium runyonii +
Endemic  +
Allium sanbornii +
Endemic  +
Allium sanbornii var. congdonii +
Endemic  +
Allium sanbornii var. sanbornii +
Endemic  +
Allium sativum +
Introduced  +
Allium sativum var. sativum +
Introduced  +
Allium schoenoprasum +
Illustrated  +
Allium scilloides +
Conservation concern  +, Endemic  +
Allium serra +
Endemic  +
Allium sharsmithiae +
Conservation concern  +, Endemic  +
Allium shevockii +
Conservation concern  +, Endemic  +, Illustrated  +
Allium simillimum +
Endemic  +, Illustrated  +
Allium siskiyouense +
Endemic  +
Allium stellatum +
Endemic  +
Allium textile +
Endemic  +, Illustrated  +, W2  +
Allium tolmiei +
Endemic  +, Illustrated  +
Allium tolmiei var. persimile +
Endemic  +, Illustrated  +
Allium tolmiei var. tolmiei +
Endemic  +, Illustrated  +
Allium tribracteatum +
Conservation concern  +, Endemic  +, Illustrated  +
Allium tricoccum +
Endemic  +
Allium tricoccum var. burdickii +
Endemic  +
Allium tricoccum var. tricoccum +
Endemic  +
Allium triquetrum +
Introduced  +
Allium tuolumnense +
Conservation concern  +, Endemic  +, Illustrated  +
Allium unifolium +
Endemic  +
Allium validum +
Endemic  +
Allium vineale +
Introduced  +, W1  +, W2  +
Allium yosemitense +
Conservation concern  +, Endemic  +, Illustrated  +
Alloteropsis cimicina +
Introduced  +
Allotropa virgata +
Endemic  +, Illustrated  +
Allowissadula holosericea +
Illustrated  +
Almutaster pauciflorus +
Illustrated  +
Alnus alnobetula subsp. crispa +
Endemic  +, Illustrated  +
Alnus alnobetula subsp. sinuata +
Endemic  +
Alnus glutinosa +
W1  +
Alnus incana subsp. rugosa +
Endemic  +, W1  +
Alnus incana subsp. tenuifolia +
Endemic  +
Alnus maritima +
Endemic  +, Illustrated  +
Alnus rhombifolia +
Endemic  +
Alnus rubra +
Endemic  +, Illustrated  +, W1  +
Alnus serrulata +
Endemic  +
Aloe vera +
Illustrated  +, Introduced  +
Alopecurus arundinaceus +
Introduced  +
Alopecurus carolinianus +
Endemic  +
Alopecurus creticus +
Introduced  +
Alopecurus myosuroides +
Introduced  +
Alopecurus pratensis +
Introduced  +
Alopecurus rendlei +
Introduced  +
Alopecurus saccatus +
Endemic  +
Alophia drummondii +
Illustrated  +
Alpinia zerumbet +
Illustrated  +, Introduced  +
Alsia californica +
Illustrated  +
Alstonia +
Introduced  +
Alstonia macrophylla +
Illustrated  +, Introduced  +
Alstonia scholaris +
Introduced  +
Alstroemeria pulchella +
Illustrated  +, Introduced  +
Alternanthera brasiliana +
Introduced  +
Alternanthera caracasana +
Illustrated  +, Introduced  +, Weedy  +
Alternanthera ficoidea var. bettzickiana +
Introduced  +
Alternanthera flavescens +
Introduced  +
Alternanthera paronychioides +
Introduced  +
Alternanthera philoxeroides +
Illustrated  +, Introduced  +, Weedy  +
Alternanthera pungens +
Introduced  +, Weedy  +
Alternanthera sessilis +
Illustrated  +, Introduced  +, Weedy  +
Althaea +
Introduced  +
Althaea armeniaca +
Introduced  +
Althaea cannabina +
Introduced  +
Althaea hirsuta +
Introduced  +
Althaea officinalis +
Illustrated  +, Introduced  +
Alvaradoa amorphoides +
Illustrated  +
Alvaradoa amorphoides subsp. psilophylla +
Illustrated  +
Alyssum alyssoides +
Introduced  +, Weedy  +
Alyssum desertorum +
Introduced  +, Weedy  +
Alyssum murale +
Introduced  +
Amaranthus acanthochiton +
Illustrated  +
Amaranthus albus +
Illustrated  +, Introduced  +, Weedy  +
Amaranthus arenicola +
Endemic  +, Illustrated  +, Weedy  +
Amaranthus australis +
Illustrated  +, Weedy  +
Amaranthus blitoides +
Illustrated  +, Weedy  +
Amaranthus blitum +
Illustrated  +, Introduced  +
Amaranthus californicus +
Endemic  +, Illustrated  +
Amaranthus cannabinus +
Endemic  +, Illustrated  +
Amaranthus caudatus +
Illustrated  +, Introduced  +
Amaranthus crassipes +
Illustrated  +
Amaranthus crispus +
Illustrated  +, Introduced  +
Amaranthus deflexus +
Illustrated  +, Introduced  +
Amaranthus dubius +
Introduced  +
Amaranthus fimbriatus +
Illustrated  +, Weedy  +
Amaranthus floridanus +
Endemic  +, Illustrated  +
Amaranthus graecizans +
Introduced  +
Amaranthus greggii +
Illustrated  +
Amaranthus hybridus +
Illustrated  +, Weedy  +
Amaranthus muricatus +
Introduced  +
Amaranthus palmeri +
Illustrated  +, Weedy  +
Amaranthus powellii +
Illustrated  +, Weedy  +
Amaranthus pumilus +
Conservation concern  +, Endemic  +
Amaranthus retroflexus +
Endemic  +, Illustrated  +, Weedy  +
Amaranthus spinosus +
Illustrated  +, Introduced  +, Weedy  +
Amaranthus torreyi +
Endemic  +, Weedy  +
Amaranthus tricolor +
Introduced  +
Amaranthus tuberculatus +
Illustrated  +, Introduced  +, Weedy  +
Amaranthus viridis +
Illustrated  +, Introduced  +, Weedy  +
Amaranthus wrightii +
Endemic  +
Amauriopsis dissecta +
Illustrated  +
Amberboa moschata +
Illustrated  +, Introduced  +
Amblyodon dealbatus +
Illustrated  +
Amblyolepis setigera +
Illustrated  +
Amblyopappus pusillus +
Illustrated  +
Amblystegium serpens +
Illustrated  +
Ambrosia acanthicarpa +
Endemic  +
Ambrosia artemisiifolia +
Endemic  +, Illustrated  +
Ambrosia bidentata +
Endemic  +
Ambrosia eriocentra +
Endemic  +, Illustrated  +
Ambrosia grayi +
Endemic  +
Ambrosia linearis +
Endemic  +
Ambrosia salsola +
Illustrated  +
Ambrosia tomentosa +
Endemic  +
Ambrosia trifida +
Illustrated  +
Amelanchier +
Endemic  +
Amelanchier alnifolia +
Endemic  +
Amelanchier alnifolia var. alnifolia +
Endemic  +
Amelanchier alnifolia var. pumila +
Endemic  +
Amelanchier alnifolia var. semiintegrifolia +
Endemic  +
Amelanchier amabilis +
Endemic  +
Amelanchier arborea +
Endemic  +
Amelanchier bartramiana +
Endemic  +
Amelanchier canadensis +
Endemic  +
Amelanchier canadensis var. canadensis +
Endemic  +
Amelanchier canadensis var. obovalis +
Endemic  +
Amelanchier cusickii +
Endemic  +
Amelanchier fernaldii +
Endemic  +
Amelanchier gaspensis +
Endemic  +
Amelanchier humilis +
Endemic  +
Amelanchier interior +
Endemic  +
Amelanchier intermedia +
Endemic  +
Amelanchier laevis +
Endemic  +, Illustrated  +
Amelanchier nantucketensis +
Endemic  +, Illustrated  +
Amelanchier nitens +
Endemic  +
Amelanchier pallida +
Endemic  +
Amelanchier sanguinea +
Endemic  +, Illustrated  +
Amelanchier spicata +
Endemic  +
Amelanchier utahensis +
Illustrated  +
Amerorchis rotundifolia +
Endemic  +, Illustrated  +
Amianthium muscitoxicum +
Endemic  +, Illustrated  +
Ammophila arenaria +
Introduced  +
Ammophila breviligulata +
Endemic  +
Ammophila breviligulata subsp. breviligulata +
Endemic  +
Ammophila breviligulata subsp. champlainensis +
Endemic  +
Amoreuxia gonzalezii +
Conservation concern  +
Amoreuxia palmatifida +
Illustrated  +
Amoreuxia wrightii +
Illustrated  +
Ampelaster carolinianus +
Endemic  +, Illustrated  +
Ampelodesmos mauritanicus +
Introduced  +
Ampelopsis aconitifolia +
Introduced  +
Ampelopsis cordata +
Endemic  +, Illustrated  +
Ampelopsis glandulosa +
Introduced  +
Amphiachyris amoena +
Endemic  +
Amphiachyris dracunculoides +
Endemic  +, Illustrated  +
Amphicarpum muhlenbergianum +
Endemic  +
Amphidium californicum +
Endemic  +, Illustrated  +
Amphidium lapponicum +
Illustrated  +
Amphidium mougeotii +
Illustrated  +
Amphipappus fremontii +
Endemic  +, Illustrated  +
Amphipappus fremontii var. fremontii +
Endemic  +, Illustrated  +
Amphipappus fremontii var. spinosus +
Endemic  +
Amphiscirpus nevadensis +
Illustrated  +
Amsonia ciliata +
Endemic  +
Amsonia ciliata var. ciliata +
Endemic  +
Amsonia ciliata var. filifolia +
Endemic  +
Amsonia ciliata var. texana +
Endemic  +
Amsonia fugatei +
Conservation concern  +, Endemic  +
Amsonia grandiflora +
Conservation concern  +
Amsonia hubrichtii +
Endemic  +
Amsonia jonesii +
Endemic  +
Amsonia kearneyana +
Conservation concern  +, Endemic  +
Amsonia ludoviciana +
Endemic  +
Amsonia palmeri +
Illustrated  +
Amsonia peeblesii +
Endemic  +
Amsonia rigida +
Endemic  +
Amsonia tabernaemontana +
Endemic  +
Amsonia tabernaemontana var. illustris +
Endemic  +
Amsonia tabernaemontana var. repens +
Endemic  +
Amsonia tabernaemontana var. salicifolia +
Endemic  +
Amsonia tabernaemontana var. tabernaemontana +
Endemic  +
Amsonia tharpii +
Conservation concern  +, Endemic  +
Amsonia tomentosa +
Endemic  +, Illustrated  +
Amsonia tomentosa var. stenophylla +
Endemic  +, Illustrated  +
Amsonia tomentosa var. tomentosa +
Endemic  +
Anacamptodon splachnoides +
Illustrated  +
Anacolia menziesii +
Illustrated  +
Anagallis arvensis +
Illustrated  +, Introduced  +, Weedy  +
Anagallis minima +
Illustrated  +
Anaphalis margaritacea +
Illustrated  +
Ancistrocactus scheeri +
Illustrated  +
Ancistrocarphus filagineus +
Illustrated  +
Andromeda polifolia +
Illustrated  +
Andromeda polifolia var. latifolia +
Illustrated  +
Andromeda polifolia var. polifolia +
Illustrated  +
Andropogon arctatus +
Endemic  +
Andropogon brachystachyus +
Endemic  +
Andropogon floridanus +
Endemic  +
Andropogon liebmannii +
Endemic  +
Andropogon tracyi +
Endemic  +
Androsace chamaejasme +
Illustrated  +
Androsace chamaejasme subsp. lehmanniana +
Endemic  +, Illustrated  +
Androsace occidentalis +
Endemic  +, Illustrated  +
Androsace septentrionalis +
Illustrated  +, Weedy  +
Androstephium breviflorum +
Endemic  +, Illustrated  +
Androstephium coeruleum +
Endemic  +
Anelsonia eurycarpa +
Endemic  +, Illustrated  +
Anemia adiantifolia +
Illustrated  +
Anemia mexicana +
Illustrated  +
Anemia wrightii +
Illustrated  +
Anemone acutiloba +
Endemic  +, Illustrated  +
Anemone americana +
Endemic  +, Illustrated  +
Anemone berlandieri +
Endemic  +, Illustrated  +
Anemone canadensis +
Endemic  +, Illustrated  +
Anemone caroliniana +
Endemic  +
Anemone cylindrica +
Endemic  +
Anemone deltoidea +
Endemic  +, Illustrated  +
Anemone drummondii var. lithophila +
Endemic  +
Anemone edwardsiana +
Endemic  +
Anemone edwardsiana var. edwardsiana +
Endemic  +
Anemone edwardsiana var. petraea +
Conservation concern  +, Endemic  +
Anemone grayi +
Endemic  +
Anemone lancifolia +
Endemic  +
Anemone lyallii +
Endemic  +
Anemone multiceps +
Endemic  +
Anemone multifida +
Illustrated  +
Anemone multifida var. multifida +
Illustrated  +
Anemone multifida var. saxicola +
Conservation concern  +, Endemic  +
Anemone multifida var. stylosa +
Conservation concern  +, Endemic  +
Anemone multifida var. tetonensis +
Endemic  +
Anemone narcissiflora +
Illustrated  +
Anemone narcissiflora var. monantha +
Illustrated  +
Anemone narcissiflora var. villosissima +
Illustrated  +
Anemone narcissiflora var. zephyra +
Endemic  +
Anemone occidentalis +
Endemic  +
Anemone okennonii +
Endemic  +
Anemone oregana +
Endemic  +, Illustrated  +
Anemone oregana var. felix +
Conservation concern  +, Endemic  +
Anemone oregana var. oregana +
Endemic  +, Illustrated  +
Anemone parviflora +
Illustrated  +
Anemone patens +
Illustrated  +
Anemone patens var. multifida +
Illustrated  +
Anemone piperi +
Endemic  +
Anemone quinquefolia +
Endemic  +, Illustrated  +
Anemone quinquefolia var. minima +
Endemic  +
Anemone quinquefolia var. quinquefolia +
Endemic  +, Illustrated  +
Anemone richardsonii +
Illustrated  +
Anemone tuberosa +
Illustrated  +
Anemone virginiana +
Endemic  +, Illustrated  +
Anemone virginiana var. alba +
Endemic  +
Anemone virginiana var. cylindroidea +
Endemic  +
Anemone virginiana var. virginiana +
Endemic  +, Illustrated  +
Anemopsis californica +
Illustrated  +, W2  +
Angadenia berteroi +
Illustrated  +
Angelonia +
Introduced  +
Angelonia gardneri +
Illustrated  +, Introduced  +
Aniseia +
Introduced  +
Aniseia martinicensis +
Illustrated  +, Introduced  +
Anisocarpus madioides +
Endemic  +, Illustrated  +
Anisocarpus scabridus +
Conservation concern  +, Endemic  +
Anisocoma acaulis +
Illustrated  +
Annona glabra +
Illustrated  +
Annona squamosa +
Introduced  +
Anoda abutiloides +
Illustrated  +
Anoda cristata +
Weedy  +
Anomobryum concinnatum +
Illustrated  +
Anomobryum julaceum +
Illustrated  +
Anomodon tristis +
Illustrated  +
Anredera cordifolia +
Illustrated  +, Introduced  +
Anredera vesicaria +
Illustrated  +
Antennaria anaphaloides +
Endemic  +
Antennaria arcuata +
Conservation concern  +, Endemic  +
Antennaria argentea +
Endemic  +
Antennaria aromatica +
Endemic  +
Antennaria corymbosa +
Endemic  +
Antennaria densifolia +
Endemic  +
Antennaria dimorpha +
Endemic  +
Antennaria flagellaris +
Endemic  +, Illustrated  +
Antennaria friesiana subsp. alaskana +
Endemic  +
Antennaria friesiana subsp. neoalaskana +
Endemic  +
Antennaria geyeri +
Endemic  +, Illustrated  +
Antennaria howellii +
Endemic  +
Antennaria howellii subsp. canadensis +
Endemic  +
Antennaria howellii subsp. howellii +
Endemic  +
Antennaria howellii subsp. neodioica +
Endemic  +
Antennaria howellii subsp. petaloidea +
Endemic  +
Antennaria lanata +
Endemic  +, Illustrated  +
Antennaria luzuloides +
Endemic  +
Antennaria luzuloides subsp. aberrans +
Endemic  +
Antennaria luzuloides subsp. luzuloides +
Endemic  +
Antennaria media +
Endemic  +
Antennaria microphylla +
Endemic  +, Illustrated  +
Antennaria monocephala +
Illustrated  +
Antennaria monocephala subsp. angustata +
Endemic  +
Antennaria monocephala subsp. monocephala +
Illustrated  +
Antennaria neglecta +
Endemic  +
Antennaria parlinii +
Endemic  +
Antennaria parlinii subsp. fallax +
Endemic  +
Antennaria parlinii subsp. parlinii +
Endemic  +
Antennaria plantaginifolia +
Endemic  +, Illustrated  +
Antennaria pulchella +
Endemic  +
Antennaria pulcherrima +
Endemic  +
Antennaria pulcherrima subsp. eucosma +
Endemic  +
Antennaria pulcherrima subsp. pulcherrima +
Endemic  +
Antennaria racemosa +
Endemic  +
Antennaria rosea +
Endemic  +
Antennaria rosea subsp. arida +
Endemic  +
Antennaria rosea subsp. confinis +
Endemic  +
Antennaria rosea subsp. pulvinata +
Endemic  +
Antennaria rosea subsp. rosea +
Endemic  +
Antennaria rosulata +
Endemic  +
Antennaria solitaria +
Endemic  +
Antennaria stenophylla +
Endemic  +
Antennaria suffrutescens +
Endemic  +
Antennaria umbrinella +
Endemic  +, Illustrated  +
Antennaria virginica +
Endemic  +
Anthemis arvensis +
Illustrated  +, Introduced  +
Anthemis cotula +
Introduced  +
Anthephora hermaphrodita +
Introduced  +
Anthoxanthum aristatum +
Introduced  +
Anthoxanthum odoratum +
Introduced  +
Antigonon leptopus +
Illustrated  +, Introduced  +
Antirrhinum +
Introduced  +
Antirrhinum majus +
Illustrated  +, Introduced  +, Weedy  +
Antitrichia californica +
Illustrated  +
Antitrichia curtipendula +
Illustrated  +
Anulocaulis annulatus +
Endemic  +, Illustrated  +
Anulocaulis leiosolenus +
Illustrated  +
Anulocaulis leiosolenus var. gypsogenus +
Endemic  +
Anulocaulis leiosolenus var. howardii +
Illustrated  +
Anulocaulis leiosolenus var. lasianthus +
Illustrated  +
Anulocaulis leiosolenus var. leiosolenus +
Illustrated  +
Anulocaulis reflexus +
Conservation concern  +
Apacheria +
Conservation concern  +, Endemic  +
Apacheria chiricahuensis +
Conservation concern  +, Endemic  +, Illustrated  +
Apera interrupta +
Introduced  +
Apera spica-venti +
Introduced  +
Aphanes arvensis +
Introduced  +
Aphanes australis +
Introduced  +
Aphanes occidentalis +
Illustrated  +
Aphanisma blitoides +
Conservation concern  +, Illustrated  +
Aphanostephus pilosus +
Endemic  +
Aphanostephus ramosissimus +
Illustrated  +
Aphanostephus ramosissimus var. humilis +
Illustrated  +
Aphanostephus ramosissimus var. ramosissimus +
Illustrated  +
Aphanostephus skirrhobasis var. skirrhobasis +
Endemic  +
Aphragmus eschscholtzianus +
Illustrated  +
Aplectrum hyemale +
Endemic  +, Illustrated  +
Aplodon wormskioldii +
Illustrated  +
Apocynum androsaemifolium +
Weedy  +
Apocynum cannabinum +
Illustrated  +, Weedy  +
Apodanthera undulata +
Illustrated  +
Apodanthera undulata var. undulata +
Illustrated  +
Aptenia cordifolia +
Illustrated  +, Introduced  +
Apteria aphylla +
Illustrated  +
Aquilegia barnebyi +
Endemic  +
Aquilegia brevistyla +
Endemic  +, Illustrated  +
Aquilegia canadensis +
Endemic  +, Illustrated  +
Aquilegia chaplinei +
Conservation concern  +, Endemic  +
Aquilegia chrysantha +
Illustrated  +
Aquilegia coerulea +
Endemic  +
Aquilegia coerulea var. alpina +
Conservation concern  +, Endemic  +
Aquilegia coerulea var. coerulea +
Endemic  +
Aquilegia coerulea var. ochroleuca +
Endemic  +
Aquilegia coerulea var. pinetorum +
Endemic  +
Aquilegia desertorum +
Endemic  +
Aquilegia elegantula +
Illustrated  +
Aquilegia eximia +
Endemic  +, Illustrated  +
Aquilegia flavescens +
Endemic  +, Illustrated  +
Aquilegia formosa +
Illustrated  +
Aquilegia formosa var. formosa +
Endemic  +
Aquilegia formosa var. hypolasia +
Illustrated  +
Aquilegia formosa var. truncata +
Endemic  +, Illustrated  +
Aquilegia hinckleyana +
Conservation concern  +, Endemic  +
Aquilegia jonesii +
Endemic  +, Illustrated  +
Aquilegia laramiensis +
Conservation concern  +, Endemic  +
Aquilegia micrantha +
Endemic  +, Illustrated  +
Aquilegia pubescens +
Endemic  +, Illustrated  +
Aquilegia saximontana +
Conservation concern  +, Endemic  +, Illustrated  +
Aquilegia scopulorum +
Endemic  +, Illustrated  +
Aquilegia shockleyi +
Endemic  +
Aquilegia vulgaris +
Introduced  +, W1  +
Arabidopsis thaliana +
Introduced  +, Weedy  +
Arabis aculeolata +
Endemic  +
Arabis blepharophylla +
Endemic  +, Illustrated  +
Arabis caucasica +
Introduced  +
Arabis crucisetosa +
Endemic  +
Arabis eschscholtziana +
Endemic  +
Arabis furcata +
Endemic  +
Arabis georgiana +
Conservation concern  +, Endemic  +
Arabis mcdonaldiana +
Conservation concern  +, Endemic  +
Arabis modesta +
Endemic  +
Arabis nuttallii +
Endemic  +
Arabis olympica +
Endemic  +
Arabis oregana +
Endemic  +
Arabis patens +
Endemic  +
Arachniodes simplicior +
Illustrated  +, Introduced  +
Araujia +
Introduced  +
Araujia odorata +
Introduced  +
Araujia sericifera +
Illustrated  +, Introduced  +, Weedy  +
Arbutus menziesii +
Endemic  +, Illustrated  +
Arceuthobium americanum +
Endemic  +, Illustrated  +
Arceuthobium campylopodum +
Illustrated  +
Arceuthobium campylopodum subsp. abietinum +
Illustrated  +
Arceuthobium campylopodum subsp. apachecum +
Illustrated  +
Arceuthobium campylopodum subsp. blumeri +
Illustrated  +
Arceuthobium campylopodum subsp. californicum +
Endemic  +
Arceuthobium campylopodum subsp. campylopodum +
Illustrated  +
Arceuthobium campylopodum subsp. cyanocarpum +
Endemic  +
Arceuthobium campylopodum subsp. laricis +
Endemic  +
Arceuthobium campylopodum subsp. littorum +
Endemic  +
Arceuthobium campylopodum subsp. microcarpum +
Endemic  +
Arceuthobium campylopodum subsp. monticola +
Endemic  +
Arceuthobium campylopodum subsp. occidentale +
Endemic  +
Arceuthobium campylopodum subsp. siskiyouense +
Endemic  +
Arceuthobium campylopodum subsp. tsugense +
Endemic  +
Arceuthobium pusillum +
Endemic  +, Illustrated  +
Arctanthemum arcticum +
Illustrated  +
Arctanthemum arcticum subsp. arcticum +
Illustrated  +
Arctanthemum arcticum subsp. polare +
Illustrated  +
Arctium lappa +
Introduced  +
Arctium minus +
Illustrated  +, Introduced  +
Arctium tomentosum +
Introduced  +
Arctomecon californica +
Conservation concern  +, Endemic  +, Illustrated  +
Arctomecon humilis +
Conservation concern  +, Endemic  +, Illustrated  +
Arctomecon merriamii +
Conservation concern  +, Endemic  +
Arctostaphylos andersonii +
Conservation concern  +, Endemic  +
Arctostaphylos auriculata +
Conservation concern  +, Endemic  +
Arctostaphylos bakeri +
Conservation concern  +, Endemic  +
Arctostaphylos bakeri subsp. bakeri +
Conservation concern  +, Endemic  +
Arctostaphylos bakeri subsp. sublaevis +
Conservation concern  +, Endemic  +
Arctostaphylos canescens +
Endemic  +, Illustrated  +
Arctostaphylos canescens subsp. canescens +
Endemic  +, Illustrated  +
Arctostaphylos canescens subsp. sonomensis +
Endemic  +
Arctostaphylos catalinae +
Conservation concern  +, Endemic  +
Arctostaphylos columbiana +
Endemic  +, Illustrated  +
Arctostaphylos confertiflora +
Conservation concern  +, Endemic  +
Arctostaphylos cruzensis +
Conservation concern  +, Endemic  +
Arctostaphylos densiflora +
Conservation concern  +, Endemic  +
Arctostaphylos edmundsii +
Conservation concern  +, Endemic  +
Arctostaphylos franciscana +
Conservation concern  +, Endemic  +
Arctostaphylos glandulosa +
Illustrated  +
Arctostaphylos glandulosa subsp. adamsii +
Conservation concern  +
Arctostaphylos glandulosa subsp. crassifolia +
Conservation concern  +
Arctostaphylos glandulosa subsp. cushingiana +
Illustrated  +
Arctostaphylos glandulosa subsp. gabrielensis +
Illustrated  +
Arctostaphylos glandulosa subsp. glandulosa +
Illustrated  +
Arctostaphylos glandulosa subsp. howellii +
Illustrated  +
Arctostaphylos glandulosa subsp. leucophylla +
Illustrated  +
Arctostaphylos glandulosa subsp. mollis +
Endemic  +
Arctostaphylos glauca +
Illustrated  +
Arctostaphylos glutinosa +
Conservation concern  +, Endemic  +
Arctostaphylos hispidula +
Endemic  +
Arctostaphylos hookeri +
Endemic  +
Arctostaphylos hookeri subsp. hearstiorum +
Endemic  +
Arctostaphylos hookeri subsp. hookeri +
Endemic  +
Arctostaphylos hooveri +
Conservation concern  +, Endemic  +
Arctostaphylos imbricata +
Conservation concern  +, Endemic  +
Arctostaphylos insularis +
Conservation concern  +, Endemic  +
Arctostaphylos klamathensis +
Conservation concern  +, Endemic  +
Arctostaphylos luciana +
Conservation concern  +, Endemic  +
Arctostaphylos malloryi +
Conservation concern  +, Endemic  +
Arctostaphylos manzanita +
Endemic  +
Arctostaphylos manzanita subsp. elegans +
Endemic  +
Arctostaphylos manzanita subsp. glaucescens +
Endemic  +
Arctostaphylos manzanita subsp. laevigata +
Endemic  +
Arctostaphylos manzanita subsp. manzanita +
Endemic  +
Arctostaphylos manzanita subsp. roofii +
Endemic  +
Arctostaphylos manzanita subsp. wieslanderi +
Endemic  +
Arctostaphylos mewukka +
Endemic  +
Arctostaphylos mewukka subsp. mewukka +
Endemic  +
Arctostaphylos mewukka subsp. truei +
Endemic  +
Arctostaphylos montaraensis +
Conservation concern  +, Endemic  +
Arctostaphylos montereyensis +
Conservation concern  +, Endemic  +
Arctostaphylos morroensis +
Conservation concern  +, Endemic  +
Arctostaphylos myrtifolia +
Conservation concern  +, Endemic  +
Arctostaphylos nevadensis +
Endemic  +
Arctostaphylos nevadensis subsp. knightii +
Endemic  +
Arctostaphylos nevadensis subsp. nevadensis +
Endemic  +
Arctostaphylos nissenana +
Conservation concern  +, Endemic  +
Arctostaphylos nortensis +
Conservation concern  +, Endemic  +
Arctostaphylos nummularia +
Conservation concern  +, Endemic  +
Arctostaphylos nummularia subsp. mendocinoensis +
Conservation concern  +, Endemic  +
Arctostaphylos nummularia subsp. nummularia +
Conservation concern  +, Endemic  +
Arctostaphylos obispoensis +
Endemic  +
Arctostaphylos otayensis +
Conservation concern  +, Endemic  +
Arctostaphylos pacifica +
Conservation concern  +, Endemic  +
Arctostaphylos pajaroensis +
Conservation concern  +, Endemic  +, Illustrated  +
Arctostaphylos pallida +
Conservation concern  +, Endemic  +
Arctostaphylos parryana +
Endemic  +
Arctostaphylos parryana subsp. desertica +
Endemic  +
Arctostaphylos parryana subsp. parryana +
Endemic  +
Arctostaphylos parryana subsp. tumescens +
Endemic  +
Arctostaphylos patula +
Illustrated  +
Arctostaphylos pilosula +
Conservation concern  +, Endemic  +
Arctostaphylos pringlei +
Illustrated  +
Arctostaphylos pringlei subsp. drupacea +
Illustrated  +
Arctostaphylos pringlei subsp. pringlei +
Illustrated  +
Arctostaphylos pumila +
Conservation concern  +, Endemic  +
Arctostaphylos pungens +
Illustrated  +
Arctostaphylos purissima +
Conservation concern  +, Endemic  +
Arctostaphylos rainbowensis +
Conservation concern  +, Endemic  +
Arctostaphylos refugioensis +
Conservation concern  +, Endemic  +
Arctostaphylos regismontana +
Conservation concern  +, Endemic  +
Arctostaphylos rudis +
Conservation concern  +, Endemic  +
Arctostaphylos silvicola +
Conservation concern  +, Endemic  +
Arctostaphylos stanfordiana +
Endemic  +, Illustrated  +
Arctostaphylos stanfordiana subsp. decumbens +
Conservation concern  +, Endemic  +
Arctostaphylos stanfordiana subsp. raichei +
Conservation concern  +, Endemic  +
Arctostaphylos stanfordiana subsp. stanfordiana +
Endemic  +, Illustrated  +
Arctostaphylos tomentosa +
Endemic  +
Arctostaphylos tomentosa subsp. bracteosa +
Conservation concern  +, Endemic  +
Arctostaphylos tomentosa subsp. daciticola +
Conservation concern  +, Endemic  +
Arctostaphylos tomentosa subsp. hebeclada +
Endemic  +
Arctostaphylos tomentosa subsp. tomentosa +
Endemic  +
Arctostaphylos uva-ursi +
Illustrated  +
Arctostaphylos virgata +
Conservation concern  +, Endemic  +
Arctostaphylos viridissima +
Conservation concern  +, Endemic  +
Arctostaphylos viscida +
Endemic  +, Illustrated  +
Arctostaphylos viscida subsp. mariposa +
Endemic  +
Arctostaphylos viscida subsp. pulchella +
Endemic  +
Arctostaphylos viscida subsp. viscida +
Endemic  +, Illustrated  +
Arctotheca calendula +
Illustrated  +, Introduced  +, Weedy  +
Arctotis fastuosa +
Introduced  +
Arctotis stoechadifolia +
Illustrated  +, Introduced  +
Ardisia crenata +
Illustrated  +, Introduced  +
Ardisia elliptica +
Introduced  +, Weedy  +
Ardisia escallonioides +
Introduced  +, Weedy  +
Arenaria benthamii +
Illustrated  +
Arenaria lanuginosa +
Illustrated  +
Arenaria lanuginosa var. lanuginosa +
Illustrated  +
Arenaria lanuginosa var. saxosa +
Illustrated  +
Arenaria livermorensis +
Conservation concern  +, Endemic  +
Arenaria paludicola +
Conservation concern  +
Arenaria serpyllifolia +
Introduced  +, Weedy  +
Arenaria serpyllifolia var. serpyllifolia +
Introduced  +, Weedy  +
Arenaria serpyllifolia var. tenuior +
Introduced  +, Weedy  +
Arethusa bulbosa +
Endemic  +, Illustrated  +
Argemone albiflora +
Endemic  +, W2  +
Argemone albiflora subsp. albiflora +
Endemic  +
Argemone albiflora subsp. texana +
Endemic  +
Argemone arizonica +
Conservation concern  +, Endemic  +, Illustrated  +
Argemone aurantiaca +
Endemic  +
Argemone corymbosa +
Endemic  +
Argemone corymbosa subsp. arenicola +
Endemic  +
Argemone corymbosa subsp. corymbosa +
Endemic  +
Argemone hispida +
Endemic  +, Illustrated  +
Argemone mexicana +
Illustrated  +, W2  +
Argemone munita +
Illustrated  +
Argemone munita subsp. argentea +
Endemic  +
Argemone munita subsp. munita +
Illustrated  +
Argemone munita subsp. robusta +
Conservation concern  +, Endemic  +
Argemone munita subsp. rotundata +
Endemic  +, Illustrated  +
Argemone ochroleuca +
Illustrated  +, Introduced  +
Argemone pleiacantha +
Illustrated  +
Argemone pleiacantha subsp. ambigua +
Endemic  +
Argemone pleiacantha subsp. pinnatisecta +
Conservation concern  +, Endemic  +, Illustrated  +
Argemone pleiacantha subsp. pleiacantha +
Illustrated  +
Argemone polyanthemos +
Endemic  +, Illustrated  +, W2  +
Argemone squarrosa +
Endemic  +, Illustrated  +, W2  +
Argemone squarrosa subsp. glabrata +
Endemic  +
Argemone squarrosa subsp. squarrosa +
Endemic  +, Illustrated  +
Argyranthemum foeniculaceum +
Illustrated  +, Introduced  +
Argyreia +
Introduced  +
Argyreia nervosa +
Illustrated  +, Introduced  +
Argyrochosma dealbata +
Endemic  +
Argyrochosma fendleri +
Illustrated  +
Argyrochosma jonesii +
Illustrated  +
Argythamnia adenophora +
Illustrated  +
Argythamnia aphoroides +
Conservation concern  +, Endemic  +
Argythamnia argyraea +
Conservation concern  +, Endemic  +
Argythamnia claryana +
Endemic  +
Argythamnia cyanophylla +
Endemic  +, Illustrated  +
Argythamnia humilis +
Illustrated  +
Argythamnia mercurialina +
Endemic  +
Argythamnia mercurialina var. mercurialina +
Endemic  +
Argythamnia mercurialina var. pilosissima +
Endemic  +
Arida arizonica +
Illustrated  +
Ariocarpus fissuratus +
Illustrated  +
Ariocarpus fissuratus var. fissuratus +
Illustrated  +
Arisaema dracontium +
Illustrated  +
Arisaema triphyllum +
Endemic  +, Illustrated  +
Aristida basiramea +
Endemic  +
Aristida condensata +
Endemic  +
Aristida desmantha +
Endemic  +
Aristida dichotoma +
Endemic  +
Aristida dichotoma var. curtissii +
Endemic  +
Aristida dichotoma var. dichotoma +
Endemic  +
Aristida gyrans +
Endemic  +
Aristida lanosa +
Endemic  +
Aristida longespica +
Endemic  +
Aristida longespica var. geniculata +
Endemic  +
Aristida longespica var. longespica +
Endemic  +
Aristida palustris +
Endemic  +
Aristida patula +
Endemic  +
Aristida purpurascens var. virgata +
Endemic  +
Aristida ramosissima +
Endemic  +
Aristida rhizomophora +
Endemic  +
Aristida simpliciflora +
Endemic  +
Aristida stricta +
Endemic  +
Aristida tuberculosa +
Endemic  +
Aristocapsa insignis +
Conservation concern  +, Endemic  +, Illustrated  +
Aristolochia californica +
Endemic  +
Aristolochia clematitis +
Introduced  +
Aristolochia erecta +
Illustrated  +
Aristolochia macrophylla +
Endemic  +, Illustrated  +
Aristolochia maxima +
Introduced  +
Aristolochia pentandra +
Endemic  +
Aristolochia reticulata +
Endemic  +, Illustrated  +
Aristolochia serpentaria +
Endemic  +
Aristolochia tomentosa +
Endemic  +
Armeria maritima +
Illustrated  +
Armeria maritima subsp. californica +
Endemic  +, Illustrated  +
Armeria maritima subsp. interior +
Endemic  +
Armeria maritima subsp. maritima +
Illustrated  +
Armeria maritima subsp. sibirica +
Endemic  +
Armoracia rusticana +
Illustrated  +, Introduced  +, Weedy  +
Arnica acaulis +
Endemic  +
Arnica angustifolia subsp. tomentosa +
Endemic  +
Arnica cernua +
Endemic  +
Arnica chamissonis +
Endemic  +
Arnica cordifolia +
Endemic  +, Illustrated  +
Arnica dealbata +
Endemic  +
Arnica discoidea +
Endemic  +
Arnica fulgens +
Endemic  +
Arnica gracilis +
Endemic  +
Arnica lanceolata +
Endemic  +
Arnica lanceolata subsp. lanceolata +
Endemic  +
Arnica lanceolata subsp. prima +
Endemic  +
Arnica latifolia +
Endemic  +, Illustrated  +
Arnica lonchophylla +
Endemic  +
Arnica longifolia +
Endemic  +
Arnica louiseana +
Endemic  +
Arnica mollis +
Endemic  +, Illustrated  +
Arnica nevadensis +
Endemic  +
Arnica ovata +
Endemic  +
Arnica parryi +
Endemic  +, Illustrated  +
Arnica rydbergii +
Endemic  +
Arnica sororia +
Endemic  +
Arnica spathulata +
Endemic  +
Arnica venosa +
Endemic  +
Arnica viscosa +
Endemic  +
Arnoglossum atriplicifolium +
Endemic  +
Arnoglossum diversifolium +
Conservation concern  +, Endemic  +
Arnoglossum floridanum +
Conservation concern  +, Endemic  +
Arnoglossum ovatum +
Endemic  +
Arnoglossum plantagineum +
Endemic  +, Illustrated  +
Arnoglossum reniforme +
Endemic  +
Arnoglossum sulcatum +
Conservation concern  +, Endemic  +
Arnoseris minima +
Illustrated  +, Introduced  +
Aronia +
Endemic  +
Aronia arbutifolia +
Endemic  +
Aronia melanocarpa +
Endemic  +, Illustrated  +
Arrhenatherum elatius +
Introduced  +
Arrhenopterum heterostichum +
Illustrated  +
Artemisia abrotanum +
Introduced  +
Artemisia absinthium +
Introduced  +
Artemisia alaskana +
Endemic  +
Artemisia aleutica +
Conservation concern  +, Endemic  +
Artemisia annua +
Introduced  +
Artemisia arbuscula +
Endemic  +
Artemisia arbuscula subsp. arbuscula +
Endemic  +
Artemisia arbuscula subsp. longiloba +
Endemic  +
Artemisia arbuscula subsp. thermopola +
Endemic  +
Artemisia biennis +
Endemic  +
Artemisia bigelovii +
Endemic  +
Artemisia borealis subsp. richardsoniana +
Endemic  +
Artemisia campestris +
Illustrated  +
Artemisia campestris subsp. canadensis +
Endemic  +, Illustrated  +
Artemisia campestris subsp. caudata +
Endemic  +
Artemisia campestris subsp. pacifica +
Endemic  +
Artemisia cana +
Endemic  +, Illustrated  +
Artemisia cana subsp. bolanderi +
Endemic  +
Artemisia cana subsp. cana +
Endemic  +, Illustrated  +
Artemisia cana subsp. viscidula +
Endemic  +
Artemisia douglasiana +
Endemic  +
Artemisia dracunculus +
Illustrated  +
Artemisia filifolia +
Endemic  +
Artemisia frigida +
Illustrated  +
Artemisia globularia subsp. lutea +
Endemic  +
Artemisia glomerata +
Endemic  +
Artemisia laciniata subsp. parryi +
Endemic  +
Artemisia longifolia +
Endemic  +
Artemisia ludoviciana +
Illustrated  +
Artemisia ludoviciana subsp. albula +
Illustrated  +
Artemisia ludoviciana subsp. candicans +
Endemic  +
Artemisia ludoviciana subsp. incompta +
Illustrated  +
Artemisia ludoviciana subsp. ludoviciana +
Endemic  +, Illustrated  +
Artemisia ludoviciana subsp. mexicana +
Illustrated  +
Artemisia ludoviciana subsp. redolens +
Illustrated  +
Artemisia michauxiana +
Endemic  +
Artemisia nesiotica +
Endemic  +
Artemisia norvegica +
Illustrated  +
Artemisia norvegica subsp. saxatilis +
Illustrated  +
Artemisia nova +
Endemic  +
Artemisia packardiae +
Conservation concern  +, Endemic  +
Artemisia papposa +
Endemic  +
Artemisia pattersonii +
Endemic  +
Artemisia pedatifida +
Endemic  +
Artemisia pontica +
Introduced  +
Artemisia porteri +
Endemic  +
Artemisia pycnocephala +
Endemic  +
Artemisia pygmaea +
Endemic  +, Illustrated  +
Artemisia rigida +
Endemic  +
Artemisia rothrockii +
Endemic  +
Artemisia scopulorum +
Endemic  +
Artemisia senjavinensis +
Illustrated  +
Artemisia serrata +
Endemic  +
Artemisia spiciformis +
Endemic  +
Artemisia suksdorfii +
Endemic  +
Artemisia tridentata +
Illustrated  +
Artemisia tridentata subsp. parishii +
Illustrated  +
Artemisia tridentata subsp. tridentata +
Endemic  +, Illustrated  +
Artemisia tridentata subsp. vaseyana +
Endemic  +
Artemisia tridentata subsp. wyomingensis +
Endemic  +
Artemisia tripartita +
Endemic  +, Illustrated  +
Artemisia tripartita subsp. rupicola +
Endemic  +, Illustrated  +
Artemisia tripartita subsp. tripartita +
Endemic  +, Illustrated  +
Artemisia vulgaris +
Introduced  +
Arthraxon hispidus +
Introduced  +
Arthrocnemum subterminale +
Illustrated  +
Aruncus dioicus +
Illustrated  +
Aruncus dioicus var. acuminatus +
Endemic  +, Illustrated  +
Aruncus dioicus var. dioicus +
Endemic  +, Illustrated  +
Aruncus dioicus var. pubescens +
Endemic  +
Aruncus dioicus var. vulgaris +
Introduced  +
Arundinaria gigantea +
Endemic  +
Arundinaria tecta +
Endemic  +
Arundo donax +
Introduced  +
Asanthus squamulosus +
Illustrated  +
Asarum canadense +
Endemic  +, Illustrated  +
Asarum caudatum +
Endemic  +, Illustrated  +
Asarum hartwegii +
Endemic  +, Illustrated  +
Asarum lemmonii +
Endemic  +
Asarum marmoratum +
Endemic  +
Asarum wagneri +
Endemic  +
Asclepias amplexicaulis +
Endemic  +
Asclepias asperula subsp. capricornu +
Endemic  +
Asclepias brachystephana +
Illustrated  +
Asclepias californica +
Endemic  +
Asclepias californica subsp. californica +
Endemic  +
Asclepias californica subsp. greenei +
Endemic  +
Asclepias cinerea +
Endemic  +
Asclepias connivens +
Endemic  +
Asclepias cordifolia +
Endemic  +, Illustrated  +
Asclepias cryptoceras +
Endemic  +, Illustrated  +
Asclepias cryptoceras subsp. cryptoceras +
Endemic  +, Illustrated  +
Asclepias cryptoceras subsp. davisii +
Endemic  +, Illustrated  +
Asclepias curassavica +
Introduced  +
Asclepias curtissii +
Endemic  +
Asclepias cutleri +
Endemic  +
Asclepias eastwoodiana +
Endemic  +
Asclepias elata +
Illustrated  +
Asclepias exaltata +
Endemic  +
Asclepias feayi +
Endemic  +
Asclepias hallii +
Endemic  +
Asclepias hirtella +
Endemic  +, Illustrated  +
Asclepias humistrata +
Endemic  +
Asclepias incarnata +
Illustrated  +
Asclepias incarnata subsp. incarnata +
Illustrated  +
Asclepias incarnata subsp. pulchra +
Endemic  +, Illustrated  +
Asclepias labriformis +
Endemic  +
Asclepias lanceolata +
Endemic  +
Asclepias lanuginosa +
Endemic  +
Asclepias longifolia +
Endemic  +
Asclepias macrosperma +
Endemic  +
Asclepias macrotis +
Illustrated  +
Asclepias meadii +
Conservation concern  +, Endemic  +
Asclepias michauxii +
Endemic  +
Asclepias obovata +
Endemic  +
Asclepias oenotheroides +
Illustrated  +
Asclepias ovalifolia +
Endemic  +
Asclepias pedicellata +
Endemic  +, Illustrated  +
Asclepias perennis +
Endemic  +
Asclepias prostrata +
Conservation concern  +
Asclepias pumila +
Endemic  +
Asclepias purpurascens +
Endemic  +
Asclepias quadrifolia +
Endemic  +
Asclepias rubra +
Endemic  +
Asclepias ruthiae +
Endemic  +
Asclepias sanjuanensis +
Endemic  +
Asclepias solanoana +
Endemic  +
Asclepias speciosa +
Endemic  +
Asclepias stenophylla +
Endemic  +, Illustrated  +
Asclepias subulata +
Illustrated  +
Asclepias sullivantii +
Endemic  +
Asclepias syriaca +
Endemic  +, Illustrated  +
Asclepias tomentosa +
Endemic  +
Asclepias tuberosa subsp. rolfsii +
Endemic  +
Asclepias tuberosa subsp. tuberosa +
Endemic  +
Asclepias uncialis +
Illustrated  +
Asclepias variegata +
Endemic  +
Asclepias verticillata +
Endemic  +
Asclepias vestita +
Endemic  +
Asclepias viridis +
Endemic  +, Illustrated  +
Asclepias viridula +
Conservation concern  +, Endemic  +
Asclepias welshii +
Conservation concern  +, Endemic  +
Asimina incana +
Endemic  +, W1  +
Asimina longifolia +
Endemic  +
Asimina longifolia var. longifolia +
Endemic  +
Asimina longifolia var. spatulata +
Endemic  +
Asimina obovata +
Endemic  +, Illustrated  +
Asimina parviflora +
Endemic  +
Asimina pygmaea +
Endemic  +, Illustrated  +
Asimina reticulata +
Endemic  +, W1  +
Asimina tetramera +
Conservation concern  +, Endemic  +, Illustrated  +
Asimina triloba +
Endemic  +, Illustrated  +, W1  +
Asparagus aethiopicus +
Introduced  +
Asparagus asparagoides +
Illustrated  +, Introduced  +
Asparagus officinalis +
Illustrated  +, Introduced  +, W2  +
Asparagus setaceus +
Introduced  +
Asphodelus fistulosus +
Illustrated  +, Introduced  +
Aspicarpa hyssopifolia +
Illustrated  +
Aspidotis californica +
Illustrated  +
Aspidotis carlotta-halliae +
Endemic  +
Aspidotis densa +
Endemic  +
Asplenium bradleyi +
Endemic  +
Asplenium ebenoides +
Endemic  +, Illustrated  +
Asplenium montanum +
Endemic  +, Illustrated  +
Asplenium pinnatifidum +
Endemic  +
Asplenium platyneuron +
Illustrated  +
Asplenium rhizophyllum +
Endemic  +, Illustrated  +
Asplenium ruta-muraria +
Illustrated  +
Asplenium serratum +
Illustrated  +
Asplenium trichomanes +
Illustrated  +
Asplenium trichomanes subsp. quadrivalens +
Illustrated  +
Asplenium trichomanes subsp. trichomanes +
Illustrated  +
Asplenium verecundum +
Endemic  +, Illustrated  +
Aster alpinus +
Illustrated  +
Aster alpinus subsp. vierhapperi +
Illustrated  +
Aster tataricus +
Introduced  +
Astilbe biternata +
Endemic  +, Illustrated  +
Astraea +
Introduced  +
Astraea lobata +
Illustrated  +, Introduced  +, Weedy  +
Astranthium ciliatum +
Illustrated  +
Astranthium integrifolium +
Endemic  +
Astranthium robustum +
Endemic  +
Astrophytum asterias +
Conservation concern  +, Illustrated  +
Atamisquea emarginata +
Illustrated  +
Athyrium filix-femina +
Illustrated  +
Athyrium filix-femina var. angustum +
Endemic  +, Illustrated  +
Athyrium filix-femina var. asplenioides +
Endemic  +
Athyrium filix-femina var. californicum +
Endemic  +
Athyrium filix-femina var. cyclosorum +
Endemic  +
Athysanus pusillus +
Illustrated  +
Atrichoseris platyphylla +
Illustrated  +
Atriplex argentea var. argentea +
Endemic  +
Atriplex argentea var. hillmanii +
Endemic  +
Atriplex argentea var. longitrichoma +
Endemic  +
Atriplex argentea var. rydbergii +
Endemic  +
Atriplex canescens +
Illustrated  +, Weedy  +
Atriplex canescens var. canescens +
Illustrated  +
Atriplex canescens var. gigantea +
Endemic  +
Atriplex canescens var. laciniata +
Illustrated  +, Weedy  +
Atriplex canescens var. macilenta +
Endemic  +
Atriplex confertifolia +
Endemic  +, Weedy  +
Atriplex cordulata +
Conservation concern  +, Endemic  +
Atriplex cordulata var. cordulata +
Conservation concern  +, Endemic  +
Atriplex cordulata var. erecticaulis +
Conservation concern  +, Endemic  +
Atriplex coronata +
Endemic  +
Atriplex coronata var. coronata +
Endemic  +
Atriplex coronata var. notatior +
Endemic  +
Atriplex coronata var. vallicola +
Conservation concern  +, Endemic  +
Atriplex corrugata +
Endemic  +
Atriplex coulteri +
Conservation concern  +, Endemic  +
Atriplex covillei +
Endemic  +
Atriplex dioica +
Endemic  +, Illustrated  +
Atriplex elegans +
Illustrated  +, Weedy  +
Atriplex elegans var. elegans +
Illustrated  +
Atriplex elegans var. fasciculata +
Weedy  +
Atriplex fruticulosa +
Endemic  +
Atriplex gardneri +
Endemic  +, Illustrated  +
Atriplex gardneri var. aptera +
Endemic  +
Atriplex gardneri var. bonnevillensis +
Conservation concern  +, Endemic  +
Atriplex gardneri var. cuneata +
Endemic  +, Illustrated  +
Atriplex gardneri var. falcata +
Endemic  +
Atriplex gardneri var. gardneri +
Endemic  +, Illustrated  +
Atriplex gardneri var. utahensis +
Endemic  +
Atriplex gardneri var. welshii +
Endemic  +
Atriplex garrettii +
Endemic  +
Atriplex garrettii var. garrettii +
Endemic  +
Atriplex garrettii var. navajoensis +
Endemic  +
Atriplex glabriuscula var. acadiensis +
Endemic  +
Atriplex glabriuscula var. franktonii +
Endemic  +
Atriplex glabriuscula var. glabriuscula +
Introduced  +
Atriplex gmelinii +
Endemic  +, Illustrated  +
Atriplex gmelinii var. alaskensis +
Endemic  +
Atriplex gmelinii var. gmelinii +
Endemic  +, Illustrated  +
Atriplex graciliflora +
Endemic  +, Illustrated  +
Atriplex heterosperma +
Introduced  +
Atriplex holocarpa +
Introduced  +
Atriplex hortensis +
Illustrated  +, Introduced  +
Atriplex hymenelytra +
Endemic  +, Illustrated  +
Atriplex klebergorum +
Conservation concern  +, Endemic  +
Atriplex laciniata +
Introduced  +
Atriplex lentiformis +
Endemic  +, Illustrated  +
Atriplex lindleyi +
Introduced  +
Atriplex littoralis +
Introduced  +
Atriplex mucronata +
Endemic  +
Atriplex nudicaulis +
Endemic  +
Atriplex nummularia +
Introduced  +
Atriplex oblongifolia +
Introduced  +
Atriplex obovata +
Illustrated  +
Atriplex parishii +
Conservation concern  +, Endemic  +
Atriplex parishii var. depressa +
Conservation concern  +, Endemic  +
Atriplex parishii var. minuscula +
Conservation concern  +, Endemic  +
Atriplex parishii var. parishii +
Conservation concern  +, Endemic  +
Atriplex parishii var. persistens +
Conservation concern  +, Endemic  +
Atriplex parishii var. subtilis +
Conservation concern  +, Endemic  +
Atriplex parryi +
Endemic  +
Atriplex patula +
Illustrated  +, Introduced  +
Atriplex phyllostegia +
Endemic  +, Illustrated  +
Atriplex pleiantha +
Endemic  +, Illustrated  +
Atriplex powellii +
Endemic  +
Atriplex powellii var. minuticarpa +
Endemic  +
Atriplex powellii var. powellii +
Endemic  +
Atriplex prostrata +
Illustrated  +, Introduced  +
Atriplex pusilla +
Endemic  +
Atriplex rosea +
Illustrated  +, Introduced  +, Weedy  +
Atriplex saccaria +
Endemic  +, Illustrated  +
Atriplex saccaria var. asterocarpa +
Endemic  +
Atriplex saccaria var. cornuta +
Endemic  +
Atriplex saccaria var. saccaria +
Endemic  +, Illustrated  +
Atriplex semibaccata +
Illustrated  +, Introduced  +, Weedy  +
Atriplex serenana var. davidsonii +
Endemic  +
Atriplex spinifera +
Endemic  +
Atriplex suberecta +
Introduced  +
Atriplex suckleyi +
Endemic  +
Atriplex tatarica +
Introduced  +
Atriplex torreyi +
Endemic  +
Atriplex torreyi var. griffithsii +
Endemic  +
Atriplex torreyi var. torreyi +
Endemic  +
Atriplex truncata +
Endemic  +, Illustrated  +
Atriplex tularensis +
Conservation concern  +, Endemic  +
Atriplex watsonii +
Illustrated  +
Atriplex wolfii +
Endemic  +
Atriplex wolfii var. tenuissima +
Endemic  +
Atriplex wolfii var. wolfii +
Endemic  +
Atropa +
Introduced  +
Atropa belladonna +
Illustrated  +, Introduced  +
Aubrieta deltoidea +
Illustrated  +, Introduced  +
Aucuba +
Introduced  +
Aucuba japonica +
Illustrated  +, Introduced  +
Aulacomnium androgynum +
Endemic  +, Illustrated  +
Aulacomnium palustre +
Illustrated  +
Aulacomnium turgidum +
Illustrated  +
Aureolaria flava +
Endemic  +
Aureolaria grandiflora +
Endemic  +
Aureolaria levigata +
Endemic  +
Aureolaria patula +
Endemic  +
Aureolaria pectinata +
Endemic  +
Aureolaria pedicularia +
Endemic  +
Aureolaria virginica +
Endemic  +, Illustrated  +
Aurinia petraea +
Introduced  +
Aurinia saxatilis +
Illustrated  +, Introduced  +
Axonopus furcatus +
Endemic  +
Axyris amaranthoides +
Illustrated  +, Introduced  +, Weedy  +
Ayenia filiformis +
Illustrated  +
Ayenia limitaris +
Conservation concern  +
Azolla caroliniana +
Illustrated  +
Azolla filiculoides +
Illustrated  +
Azolla mexicana +
Illustrated  +
B
Baccharis angustifolia +
Endemic  +
Baccharis glomeruliflora +
Endemic  +
Baccharis halimifolia +
Illustrated  +
Baccharis malibuensis +
Conservation concern  +, Endemic  +
Baccharis pilularis subsp. pilularis +
Endemic  +
Baccharis plummerae +
Endemic  +
Baccharis plummerae subsp. glabrata +
Conservation concern  +, Endemic  +
Baccharis plummerae subsp. plummerae +
Endemic  +
Baccharis salicifolia +
Illustrated  +
Baccharis salicina +
Endemic  +
Baccharis sarothroides +
Illustrated  +
Baccharis vanessae +
Conservation concern  +, Endemic  +
Bacopa caroliniana +
Endemic  +, Weedy  +
Bacopa egensis +
Introduced  +
Bacopa eisenii +
Endemic  +, Weedy  +
Bacopa innominata +
Endemic  +, Weedy  +
Bacopa monnieri +
Illustrated  +, Weedy  +
Bacopa repens +
Introduced  +, Weedy  +
Bacopa rotundifolia +
Endemic  +, Illustrated  +, Weedy  +
Bahia absinthifolia +
Illustrated  +
Bahia bigelovii +
Endemic  +
Bahia biternata +
Endemic  +
Bahiopsis parishii +
Illustrated  +
Bahiopsis reticulata +
Endemic  +
Baileya multiradiata +
Illustrated  +
Balduina angustifolia +
Endemic  +, Illustrated  +
Balduina atropurpurea +
Endemic  +
Balduina uniflora +
Endemic  +
Balsamorhiza careyana +
Endemic  +
Balsamorhiza deltoidea +
Endemic  +
Balsamorhiza hispidula +
Endemic  +
Balsamorhiza hookeri +
Endemic  +
Balsamorhiza incana +
Endemic  +
Balsamorhiza lanata +
Conservation concern  +, Endemic  +
Balsamorhiza macrolepis +
Conservation concern  +, Endemic  +
Balsamorhiza macrophylla +
Endemic  +
Balsamorhiza rosea +
Endemic  +, Illustrated  +
Balsamorhiza sagittata +
Endemic  +, Illustrated  +
Balsamorhiza sericea +
Endemic  +
Balsamorhiza serrata +
Endemic  +
Bambusa bambos +
Introduced  +
Bambusa multiplex +
Introduced  +
Bambusa vulgaris +
Introduced  +
Barbarea orthoceras +
Illustrated  +
Barbarea stricta +
Introduced  +
Barbarea verna +
Introduced  +
Barbarea vulgaris +
Introduced  +, Weedy  +
Barbella pendula +
Illustrated  +
Barkleyanthus salicifolius +
Illustrated  +
Bartlettia scaposa +
Illustrated  +
Bartonia +
Endemic  +
Bartonia paniculata +
Endemic  +, Illustrated  +
Bartonia paniculata subsp. iodandra +
Endemic  +
Bartonia paniculata subsp. paniculata +
Endemic  +, Illustrated  +
Bartonia paniculata subsp. texana +
Conservation concern  +, Endemic  +
Bartonia verna +
Endemic  +
Bartonia virginica +
Endemic  +
Bartramia ithyphylla +
Illustrated  +
Bartramia pomiformis +
Illustrated  +
Bartramia stricta +
Illustrated  +
Bartsia alpina +
Illustrated  +
Basiphyllaea corallicola +
Conservation concern  +, Illustrated  +
Bassia hirsuta +
Introduced  +
Bassia hyssopifolia +
Illustrated  +, Introduced  +, Weedy  +
Bastardia viscosa +
Illustrated  +
Batesimalva +
Conservation concern  +
Batesimalva violacea +
Conservation concern  +, Illustrated  +
Batis maritima +
Illustrated  +
Bebbia juncea +
Illustrated  +
Bebbia juncea var. aspera +
Illustrated  +
Begonia +
Introduced  +
Begonia cucullata +
Illustrated  +, Introduced  +
Begonia hirtella +
Introduced  +
Bejaria racemosa +
Endemic  +, Illustrated  +
Belamcanda chinensis +
Illustrated  +, Introduced  +
Bellardia +
Introduced  +
Bellardia latifolia +
Introduced  +
Bellardia trixago +
Illustrated  +, Introduced  +
Bellardia viscosa +
Introduced  +
Bellis perennis +
Illustrated  +, Introduced  +
Beloglottis costaricensis +
Illustrated  +
Benitoa occidentalis +
Endemic  +, Illustrated  +
Bensoniella oregona +
Endemic  +, Illustrated  +
Berberis amplectens +
Conservation concern  +, Endemic  +
Berberis aquifolium +
Endemic  +, Illustrated  +
Berberis bealei +
Introduced  +
Berberis canadensis +
Endemic  +
Berberis darwinii +
Introduced  +
Berberis dictyota +
Endemic  +, Illustrated  +
Berberis fendleri +
Endemic  +, Illustrated  +
Berberis fremontii +
Endemic  +, Illustrated  +
Berberis haematocarpa +
Illustrated  +
Berberis harrisoniana +
Conservation concern  +, Endemic  +
Berberis higginsiae +
Conservation concern  +
Berberis nervosa +
Endemic  +, Illustrated  +
Berberis nevinii +
Conservation concern  +, Endemic  +
Berberis pinnata subsp. insularis +
Conservation concern  +, Endemic  +
Berberis piperiana +
Endemic  +, Illustrated  +
Berberis pumila +
Endemic  +
Berberis repens +
Endemic  +, Illustrated  +
Berberis swaseyi +
Endemic  +
Berberis thunbergii +
Introduced  +, W2  +
Berberis trifoliolata +
Illustrated  +
Berberis vulgaris +
Introduced  +, W2  +
Berchemia scandens +
Illustrated  +
Bergerocactus emoryi +
Illustrated  +
Bergia texana +
Illustrated  +
Berlandiera pumila +
Endemic  +, Illustrated  +
Berlandiera subacaulis +
Endemic  +
Berlandiera texana +
Endemic  +
Bernardia obovata +
Illustrated  +
Berteroa incana +
Illustrated  +, Introduced  +, Weedy  +
Bestia +
Endemic  +
Bestia longipes +
Endemic  +, Illustrated  +
Beta vulgaris +
Illustrated  +, Introduced  +
Beta vulgaris subsp. maritima +
Introduced  +
Beta vulgaris subsp. vulgaris +
Illustrated  +, Introduced  +
Betula alleghaniensis +
Endemic  +, Illustrated  +
Betula cordifolia +
Endemic  +
Betula glandulosa +
Endemic  +, Illustrated  +
Betula kenaica +
Endemic  +
Betula lenta +
Endemic  +
Betula michauxii +
Endemic  +
Betula minor +
Endemic  +
Betula murrayana +
Conservation concern  +, Endemic  +
Betula neoalaskana +
Endemic  +
Betula nigra +
Endemic  +, Illustrated  +, W1  +
Betula occidentalis +
Endemic  +, Illustrated  +
Betula papyrifera +
Endemic  +, Illustrated  +
Betula populifolia +
Endemic  +, Illustrated  +, W1  +
Betula pubescens subsp. pubescens +
Introduced  +
Betula pumila +
Endemic  +
Betula uber +
Conservation concern  +, Endemic  +
Bidens amplissima +
Conservation concern  +, Endemic  +
Bidens aristosa +
Endemic  +, Illustrated  +
Bidens beckii +
Endemic  +
Bidens bidentoides +
Endemic  +
Bidens bipinnata +
Illustrated  +, Introduced  +
Bidens cernua +
Illustrated  +
Bidens discoidea +
Endemic  +
Bidens eatonii +
Endemic  +
Bidens frondosa +
Illustrated  +
Bidens heterodoxa +
Endemic  +
Bidens hyperborea +
Endemic  +
Bidens mitis +
Endemic  +
Bidens polylepis +
Endemic  +
Bidens trichosperma +
Endemic  +
Bidens vulgata +
Endemic  +
Bigelowia nudata +
Endemic  +
Bigelowia nudata var. australis +
Endemic  +
Bigelowia nudata var. nudata +
Endemic  +
Bigelowia nuttallii +
Endemic  +, Illustrated  +
Billieturnera helleri +
Illustrated  +
Bischofia +
Introduced  +
Bischofia javanica +
Illustrated  +, Introduced  +
Bistorta bistortoides +
Endemic  +
Bistorta officinalis +
Introduced  +
Bistorta vivipara +
Illustrated  +
Blennosperma bakeri +
Conservation concern  +, Endemic  +
Blennosperma nanum +
Endemic  +, Illustrated  +
Blennosperma nanum var. nanum +
Endemic  +, Illustrated  +
Blennosperma nanum var. robustum +
Conservation concern  +, Endemic  +
Blepharidachne kingii +
Endemic  +
Blepharipappus scaber +
Endemic  +, Illustrated  +
Blepharizonia laxa +
Endemic  +
Blepharizonia plumosa +
Conservation concern  +, Endemic  +, Illustrated  +
Bletia purpurea +
Illustrated  +
Bloomeria clevelandii +
Conservation concern  +, Illustrated  +
Bloomeria crocea +
Illustrated  +
Bloomeria crocea var. aurea +
Endemic  +
Bloomeria crocea var. crocea +
Illustrated  +
Bloomeria crocea var. montana +
Endemic  +
Bloomeria humilis +
Conservation concern  +, Endemic  +
Blutaparon vermiculare +
Illustrated  +
Blysmopsis rufa +
Illustrated  +
Blyxa aubertii +
Illustrated  +, Introduced  +
Boehmeria cylindrica +
Illustrated  +
Boehmeria nivea +
Introduced  +
Boerhavia coccinea +
Illustrated  +
Boerhavia coulteri +
Illustrated  +, Weedy  +
Boerhavia coulteri var. coulteri +
Illustrated  +
Boerhavia coulteri var. palmeri +
Illustrated  +, Weedy  +
Boerhavia diffusa +
Illustrated  +, Weedy  +
Boerhavia erecta +
Illustrated  +
Boerhavia intermedia +
Illustrated  +
Boerhavia megaptera +
Endemic  +
Boerhavia spicata +
Illustrated  +
Boerhavia torreyana +
Illustrated  +
Bolandra californica +
Endemic  +
Bolandra oregana +
Endemic  +, Illustrated  +
Bolboschoenus fluviatilis +
Illustrated  +
Bolboschoenus glaucus +
Illustrated  +, Introduced  +
Bolboschoenus maritimus +
Illustrated  +
Bolboschoenus maritimus subsp. maritimus +
Illustrated  +
Bolboschoenus maritimus subsp. paludosus +
Illustrated  +
Bolboschoenus novae-angliae +
Endemic  +, Illustrated  +
Bolboschoenus robustus +
Illustrated  +
Boltonia apalachicolensis +
Endemic  +, Illustrated  +
Boltonia asteroides +
Endemic  +, Illustrated  +
Boltonia asteroides var. asteroides +
Endemic  +, Illustrated  +
Boltonia asteroides var. latisquama +
Endemic  +
Boltonia asteroides var. recognita +
Endemic  +
Boltonia caroliniana +
Endemic  +
Boltonia decurrens +
Conservation concern  +, Endemic  +
Boltonia diffusa +
Endemic  +, Illustrated  +
Boltonia diffusa var. diffusa +
Endemic  +, Illustrated  +
Boltonia diffusa var. interior +
Endemic  +
Bommeria hispida +
Illustrated  +
Bonamia grandiflora +
Conservation concern  +, Endemic  +, Illustrated  +
Bonamia ovalifolia +
Conservation concern  +
Bontia daphnoides +
Illustrated  +
Borrichia frutescens +
Illustrated  +
Boschniakia rossica +
Illustrated  +
Bothriochloa bladhii +
Introduced  +
Bothriochloa ischaemum +
Introduced  +
Bothriochloa pertusa +
Introduced  +
Botrychium ascendens +
Endemic  +
Botrychium biternatum +
Endemic  +
Botrychium boreale +
Endemic  +
Botrychium campestre +
Conservation concern  +, Endemic  +, Illustrated  +
Botrychium crenulatum +
Endemic  +
Botrychium echo +
Conservation concern  +, Endemic  +
Botrychium hesperium +
Endemic  +
Botrychium lanceolatum +
Illustrated  +
Botrychium lanceolatum subsp. angustisegmentum +
Endemic  +
Botrychium lanceolatum subsp. lanceolatum +
Illustrated  +
Botrychium lunaria +
Illustrated  +
Botrychium lunarioides +
Endemic  +
Botrychium matricariifolium +
Illustrated  +
Botrychium minganense +
Endemic  +, Illustrated  <