Property:Phenology

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Amaranthus powellii +
Flowering summer–fall.  +
Amaranthus pumilus +
Flowering summer–fall.  +
Amaranthus retroflexus +
Flowering summer–fall.  +
Amaranthus scleropoides +
Flowering summer–fall.  +
Amaranthus spinosus +
Flowering summer–fall.  +
Amaranthus tamaulipensis +
Flowering spring–fall.  +
Amaranthus thunbergii +
Flowering summer–fall.  +
Amaranthus torreyi +
Flowering summer–fall.  +
Amaranthus tricolor +
Flowering summer–fall.  +
Amaranthus tuberculatus +
Flowering summer–fall.  +
Amaranthus viridis +
Flowering summer–fall.  +
Amaranthus viscidulus +
Flowering summer–fall.  +
Amaranthus watsonii +
Flowering late winter–spring, summer–fall.  +
Amaranthus wrightii +
Flowering summer–fall.  +
Amauriopsis dissecta +
Flowering (Jun–)Aug–Sep(–Oct).  +
Amberboa moschata +
Flowering winter–early summer (Jan–Jul).  +
Amblyolepis setigera +
Flowering (Jan–)Mar–May(–Sep).  +
Amblyopappus pusillus +
Flowering spring.  +
Ambrosia acanthicarpa +
Flowering (Apr–)Jul–Nov.  +
Ambrosia ambrosioides +
Flowering Mar–May.  +
Ambrosia artemisiifolia +
Flowering Jul–Oct.  +
Ambrosia bidentata +
Flowering Jul–Oct.  +
Ambrosia chamissonis +
Flowering Apr–Nov.  +
Ambrosia cheiranthifolia +
Flowering Jun–Nov.  +
Ambrosia chenopodiifolia +
Flowering Mar–Apr.  +
Ambrosia confertiflora +
Flowering (May–)Sep–Dec.  +
Ambrosia cordifolia +
Flowering Mar–Apr.  +
Ambrosia deltoidea +
Flowering Feb–May.  +
Ambrosia dumosa +
Flowering Mar–May(–Dec).  +
Ambrosia eriocentra +
Flowering Apr–May(–Jul).  +
Ambrosia grayi +
Flowering Aug–Sep.  +
Ambrosia hispida +
Flowering Apr.  +
Ambrosia ilicifolia +
Flowering Jan–Apr.  +
Ambrosia linearis +
Flowering Jul.  +
Ambrosia monogyra +
Flowering (May–)Aug–Nov.  +
Ambrosia psilostachya +
Flowering Jul–Oct(–Dec).  +
Ambrosia pumila +
Flowering May–Jun(–Oct).  +
Ambrosia salsola +
Flowering Mar–May(–Jun).  +
Ambrosia tomentosa +
Flowering Jun–Sep.  +
Ambrosia trifida +
Flowering Jul–Nov.  +
Amelanchier alnifolia var. alnifolia +
Flowering May–Jul  +, fruiting Jul–Aug.  +
Amelanchier alnifolia var. pumila +
Flowering May–Jun  +, fruiting Jul–Sep.  +
Amelanchier alnifolia var. semiintegrifolia +
Flowering Mar–Jun  +, fruiting Jun–Aug.  +
Amelanchier amabilis +
Flowering May–Jun  +, fruiting Jul–Aug.  +
Amelanchier arborea +
Flowering Feb–May  +, fruiting May–Jul.  +
Amelanchier bartramiana +
Flowering May–Aug  +, fruiting Jul–Sep.  +
Amelanchier canadensis var. canadensis +
Flowering Mar–May  +, fruiting Jun–Jul.  +
Amelanchier canadensis var. obovalis +
Flowering Mar–May  +, fruiting May–Jun.  +
Amelanchier cusickii +
Flowering Mar–Jul  +, fruiting May–Aug.  +
Amelanchier fernaldii +
Flowering Jun–Jul  +, fruiting Jul–Aug.  +
Amelanchier gaspensis +
Flowering May–Jun  +, fruiting Jul–Sep.  +
Amelanchier humilis +
Flowering Apr–May  +, fruiting Jul–Aug.  +
Amelanchier interior +
Flowering May–Jun  +, fruiting Jul–Aug.  +
Amelanchier intermedia +
Flowering May–Jun  +, fruiting Jun–Aug.  +
Amelanchier laevis +
Flowering Apr–Jun  +, fruiting Jun–Jul.  +
Amelanchier nantucketensis +
Flowering Mar–May  +, fruiting Jun–Jul.  +
Amelanchier nitens +
Flowering Apr–Jun  +, fruiting Jun–Jul.  +
Amelanchier pallida +
Flowering Apr–Jun  +, fruiting Jul–Sep.  +
Amelanchier sanguinea +
Flowering May–Jun  +, fruiting Jul–Aug.  +
Amelanchier spicata +
Flowering Apr–Jun  +, fruiting Jul–Aug.  +
Amelanchier utahensis +
Flowering Apr–May  +, fruiting Jul–Sep.  +
Amerorchis rotundifolia +
Flowering Jun–Jul.  +
Amianthium muscitoxicum +
Flowering late spring–summer.  +
Ammannia auriculata +
Flowering late spring–late fall.  +
Ammannia coccinea +
Flowering late spring–late fall.  +
Ammannia grayi +
Flowering late spring–fall (May–Sep).  +
Ammannia latifolia +
Flowering late spring–late fall.  +
Ammannia robusta +
Flowering late spring–late fall.  +
Amoreuxia gonzalezii +
Flowering Jul–Sep.  +
Amoreuxia palmatifida +
Flowering Jun–Sep  +, fruiting Jul–Oct.  +
Amoreuxia wrightii +
Flowering May–Jul(–Oct).  +
Ampelaster carolinianus +
Flowering peak late fall–winter, year round (Fla).  +
Ampelopsis aconitifolia +
Flowering May–Aug  +, fruiting Jun–Oct.  +
Ampelopsis cordata +
Flowering late Apr–Jun  +, fruiting Jul–Sep.  +
Ampelopsis glandulosa +
Flowering late May–Jul  +, fruiting Jul–Oct.  +
Amphiachyris amoena +
Flowering late Sep–Oct.  +
Amphiachyris dracunculoides +
Flowering Jul–Nov.  +
Amphipappus fremontii var. fremontii +
Flowering Mar–May.  +
Amphipappus fremontii var. spinosus +
Flowering Mar–May.  +
Amphiscirpus nevadensis +
Fruiting summer.  +
Anacamptodon splachnoides +
Capsules mature (Jan-)Apr–Oct(-Dec).  +
Anacolia menziesii +
Capsules mature Feb–Aug.  +
Anagallis arvensis +
Flowering spring–summer.  +
Anagallis minima +
Flowering spring–fall.  +
Anagallis monelli +
Flowering spring–fall.  +
Anagallis pumila +
Flowering spring–early winter.  +
Anaphalis margaritacea +
Flowering Jul–Oct (sporadically longer).  +
Ancistrocactus brevihamatus +
Flowering Jan–Mar.  +
Ancistrocactus scheeri +
Flowering Nov–Mar.  +
Ancistrocarphus filagineus +
Flowering and fruiting mid Mar–late Jun.  +
Ancistrocarphus keilii +
Flowering and fruiting Mar–Apr.  +
Andreaeobryum macrosporum +
Capsules mature late summer.  +
Andromeda polifolia var. latifolia +
Flowering May–Jul(-Sep)  +, fruiting Jun–Sep.  +
Andromeda polifolia var. polifolia +
Flowering May–Aug  +, fruiting Jun–Sep.  +
Androsace chamaejasme subsp. lehmanniana +
Flowering summer.  +
Androsace elongata subsp. acuta +
Flowering early-mid summer.  +
Androsace filiformis +
Flowering early-mid summer.  +
Androsace occidentalis +
Flowering early-mid summer.  +
Androsace septentrionalis +
Flowering spring–early fall.  +
Androstephium breviflorum +
Flowering spring (Mar–Jun).  +
Androstephium coeruleum +
Flowering spring (Feb–May).  +
Anelsonia eurycarpa +
Flowering Jun–Jul.  +
Anemone acutiloba +
Flowering spring.  +
Anemone americana +
Flowering spring.  +
Anemone berlandieri +
Flowering winter–spring (Feb–Apr).  +
Anemone canadensis +
Flowering spring–summer (May–Aug).  +
Anemone caroliniana +
Flowering winter–spring (Feb–Apr).  +
Anemone cylindrica +
Flowering summer (Jun–Jul).  +
Anemone deltoidea +
Flowering spring–summer (Apr–Jul).  +
Anemone drummondii var. drummondii +
Flowering summer (Jun–Aug).  +
Anemone drummondii var. lithophila +
Flowering summer (Jun–Aug).  +
Anemone edwardsiana var. edwardsiana +
Flowering winter–spring (Feb–Apr).  +
Anemone edwardsiana var. petraea +
Flowering winter–spring (Feb–Apr).  +
Anemone grayi +
Flowering winter–early summer (Feb–Jun).  +
Anemone lancifolia +
Flowering spring–summer (Apr–Jun).  +
Anemone lyallii +
Flowering spring–summer (Mar–Jul).  +
Anemone multiceps +
Flowering spring–summer (May–Jul).  +
Anemone multifida var. multifida +
Flowering spring–summer (Apr–Jul).  +
Anemone multifida var. saxicola +
Flowering summer (Jun–Aug).  +
Anemone multifida var. stylosa +
Flowering summer (Jul–Aug).  +
Anemone multifida var. tetonensis +
Flowering spring–summer (Mar–Aug).  +
Anemone narcissiflora var. monantha +
Flowering spring–summer (May–Jul).  +
Anemone narcissiflora var. villosissima +
Flowering spring–summer (May–Aug).  +
Anemone narcissiflora var. zephyra +
Flowering summer (Jun–Aug).  +
Anemone occidentalis +
Flowering spring–summer (May–Aug/Sep).  +
Anemone okennonii +
Flowering spring (Mar–Apr).  +
Anemone oregana var. felix +
Flowering spring (Apr–Jun).  +
Anemone oregana var. oregana +
Flowering spring (Mar–Jun).  +
Anemone parviflora +
Flowering spring–summer (May–Aug).  +
Anemone patens var. multifida +
Flowering spring–summer (Apr–Aug).  +
Anemone piperi +
Flowering spring–summer (Apr–Aug).  +
Anemone quinquefolia var. minima +
Flowering spring (Apr–May).  +
Anemone quinquefolia var. quinquefolia +
Flowering spring–early summer (Mar–Jun).  +
Anemone richardsonii +
Flowering spring–summer (May–Aug).  +
Anemone tuberosa +
Flowering spring (Apr–May).  +
Anemone virginiana var. alba +
Flowering spring–summer (May–Jul).  +
Anemone virginiana var. cylindroidea +
Flowering summer (Jun–Aug).  +
Anemone virginiana var. virginiana +
Flowering summer (Jun–Aug).  +
Anemopsis californica +
Flowering early spring–summer.  +
Angelonia gardneri +
Flowering May–Oct.  +
Anisocarpus madioides +
Flowering Apr–Sep.  +
Anisocarpus scabridus +
Flowering Jun–Sep.  +
Anisocoma acaulis +
Flowering Mar–May.  +
Annona glabra +
Flowering spring–early summer.  +
Annona squamosa +
Flowering spring–early summer.  +
Anoda abutiloides +
Flowering spring–fall.  +
Anoda crenatiflora +
Flowering fall.  +
Anoda cristata +
Flowering summer–fall.  +
Anoda lanceolata +
Flowering summer–fall.  +
Anoda pentaschista +
Flowering late summer–mid winter.  +
Anoda reticulata +
Flowering late summer.  +
Anoda thurberi +
Flowering late summer–early fall.  +
Anomobryum concinnatum +
Capsules mature Jul–Sep.  +
Anomobryum julaceum +
Capsules mature Jun–Sep.  +
Anomodon attenuatus +
Capsules mature early-mid fall.  +
Anomodon minor +
Capsules mature early fall.  +
Anomodon rostratus +
Capsules mature early-mid fall.  +
Anomodon rugelii +
Capsules mature mid fall.  +
Anomodon viticulosus +
Capsules mature early-mid fall.  +
Anredera cordifolia +
Flowering late summer–fall.  +
Anredera vesicaria +
Flowering late summer–fall.  +
Antennaria alpina +
Flowering mid–late summer.  +
Antennaria anaphaloides +
Flowering summer.  +
Antennaria arcuata +
Flowering summer.  +
Antennaria argentea +
Flowering summer.  +
Antennaria aromatica +
Flowering mid summer.  +
Antennaria corymbosa +
Flowering early–mid summer.  +
Antennaria densifolia +
Flowering summer.  +
Antennaria dimorpha +
Flowering early–mid spring.  +
Antennaria dioica +
Flowering summer.  +
Antennaria flagellaris +
Flowering mid–late spring.  +
Antennaria friesiana subsp. alaskana +
Flowering summer.  +
Antennaria friesiana subsp. friesiana +
Flowering summer.  +
Antennaria friesiana subsp. neoalaskana +
Flowering summer.  +
Antennaria geyeri +
Flowering summer.  +
Antennaria howellii subsp. canadensis +
Flowering mid spring–early summer.  +
Antennaria howellii subsp. howellii +
Flowering mid spring–early summer.  +
Antennaria howellii subsp. neodioica +
Flowering mid spring–early summer.  +
Antennaria howellii subsp. petaloidea +
Flowering mid spring–early summer.  +
Antennaria lanata +
Flowering summer.  +
Antennaria luzuloides subsp. aberrans +
Flowering summer.  +
Antennaria luzuloides subsp. luzuloides +
Flowering summer.  +
Antennaria marginata +
Flowering summer.  +
Antennaria media +
Flowering summer.  +
Antennaria microphylla +
Flowering early–mid summer.  +
Antennaria monocephala subsp. angustata +
Flowering summer.  +
Antennaria monocephala subsp. monocephala +
Flowering summer.  +
Antennaria neglecta +
Flowering early–mid spring.  +
Antennaria parlinii subsp. fallax +
Flowering early–mid spring.  +
Antennaria parlinii subsp. parlinii +
Flowering early–mid spring.  +
Antennaria parvifolia +
Flowering late spring–summer.  +
Antennaria plantaginifolia +
Flowering mid–late spring.  +
Antennaria pulchella +
Flowering summer.  +
Antennaria pulcherrima subsp. eucosma +
Flowering summer.  +
Antennaria pulcherrima subsp. pulcherrima +
Flowering summer.  +
Antennaria racemosa +
Flowering summer.  +
Antennaria rosea subsp. arida +
Flowering summer.  +
Antennaria rosea subsp. confinis +
Flowering summer.  +
Antennaria rosea subsp. pulvinata +
Flowering summer.  +
Antennaria rosea subsp. rosea +
Flowering summer.  +
Antennaria rosulata +
Flowering summer.  +
Antennaria soliceps +
Flowering summer.  +
Antennaria solitaria +
Flowering early–mid spring.  +
Antennaria stenophylla +
Flowering in late spring–early summer.  +
Antennaria suffrutescens +
Flowering early summer.  +
Antennaria umbrinella +
Flowering summer.  +
Antennaria virginica +
Flowering early–mid spring.  +
Anthemis arvensis +
Flowering May–Jul(–Sep).  +
Anthemis cotula +
Flowering (Apr–)May–Aug(–Oct).  +
Antigonon leptopus +
Flowering year-round.  +
Antirrhinum majus +
Flowering May–Oct.  +
Anulocaulis annulatus +
Flowering late winter–late summer, occasionally mid fall.  +
Anulocaulis eriosolenus +
Flowering late spring-mid fall.  +
Anulocaulis leiosolenus var. gypsogenus +
Flowering late spring–early fall.  +
Anulocaulis leiosolenus var. howardii +
Flowering late spring–early fall.  +
Anulocaulis leiosolenus var. lasianthus +
Flowering late spring–early fall.  +
Anulocaulis leiosolenus var. leiosolenus +
Flowering late spring–early fall.  +
Anulocaulis reflexus +
Flowering late spring–early fall.  +
Aongstroemia longipes +
Capsules mature late summer.  +
Apacheria chiricahuensis +
Flowering Apr–Nov.  +
Aphanes arvensis +
Flowering Apr–May.  +
Aphanes australis +
Flowering Mar–May.  +
Aphanes occidentalis +
Flowering Mar–Jun.  +
Aphanisma blitoides +
Flowering summer–early fall.  +
Aphanorrhegma serratum +
Capsules mature (Jul) Sep–Dec.  +
Aphanostephus pilosus +
Flowering May–Jul.  +
Aphanostephus ramosissimus var. humilis +
Flowering Apr–Jun(–Oct).  +
Aphanostephus ramosissimus var. ramosissimus +
Flowering (Feb–)Apr–Jul(–Sep).  +
Aphanostephus riddellii +
Flowering Mar–Aug(–Oct).  +
Aphanostephus skirrhobasis var. kidderi +
Flowering Mar–Jun(–Aug).  +
Aphanostephus skirrhobasis var. skirrhobasis +
Flowering (Mar–)Apr–Jul(–Aug).  +
Aphanostephus skirrhobasis var. thalassius +
Flowering (Feb–)Apr–Dec.  +
Aphragmus eschscholtzianus +
Flowering Jun–Jul.  +
Aplectrum hyemale +
Flowering late spring.  +
Aplodon wormskioldii +
Capsules mature summer.  +
Apodanthera undulata var. undulata +
Flowering May–Sep.  +
Aponogeton distachyos +
Flowering late winter–spring (Mar–Apr), fall (Oct–Nov).  +
Aptenia cordifolia +
Flowering spring–fall.  +
Apteria aphylla +
Flowering late summer–fall.  +
Aquilegia barnebyi +
Flowering summer (Jun–Jul).  +
Aquilegia brevistyla +
Flowering summer (Jun–Aug).  +
Aquilegia canadensis +
Flowering spring–summer (Mar–Jun).  +
Aquilegia chaplinei +
Flowering summer (Jul–Aug).  +
Aquilegia chrysantha +
Flowering spring–summer (Apr–Sep).  +
Aquilegia coerulea var. alpina +
Flowering summer (Jun–Aug).  +
Aquilegia coerulea var. coerulea +
Flowering summer (mid Jun-early Sep).  +
Aquilegia coerulea var. ochroleuca +
Flowering summer (late Jun–Aug).  +
Aquilegia coerulea var. pinetorum +
Flowering spring–summer (May–Sep).  +
Aquilegia desertorum +
Flowering spring–fall (May–Oct).  +
Aquilegia elegantula +
Flowering spring–summer (May–Jul).  +
Aquilegia eximia +
Flowering spring–summer (May–Aug).  +
Aquilegia flavescens +
Flowering summer (Jun–Aug).  +
Aquilegia formosa var. formosa +
Flowering spring–summer (Apr–Aug).  +
Aquilegia formosa var. hypolasia +
Flowering summer (Jun–Aug).  +
Aquilegia formosa var. truncata +
Flowering spring–summer (Apr–Aug).  +
Aquilegia hinckleyana +
Flowering spring (Mar–Apr).  +
Aquilegia jonesii +
Flowering summer (Jun–Jul).  +
Aquilegia laramiensis +
Flowering summer (Jun–Jul).  +
Aquilegia longissima +
Flowering summer (Jul–Sep).  +
Aquilegia micrantha +
Flowering spring–summer (Apr–Sep).  +
Aquilegia pubescens +
Flowering summer (Jun–Aug).  +
Aquilegia saximontana +
Flowering summer (Jul–Aug).  +
Aquilegia scopulorum +
Flowering summer (Jun–Aug).  +
Aquilegia shockleyi +
Flowering spring–summer (Apr–Aug).  +
Aquilegia vulgaris +
Flowering spring–summer (May–Jul).  +
Arabidopsis arenicola +
Flowering Jun–Aug.  +
Arabidopsis arenosa subsp. arenosa +
Flowering Jul.  +
Arabidopsis lyrata subsp. kamchatica +
Flowering Jun–Jul.  +
Arabidopsis lyrata subsp. lyrata +
Flowering Apr–Jul.  +
Arabidopsis lyrata subsp. petraea +
Flowering Jun–Jul.  +
Arabidopsis thaliana +
Flowering Feb–May.  +
Arabis aculeolata +
Flowering Mar–May(-Jun).  +
Arabis alpina +
Flowering Jun–Aug.  +
Arabis blepharophylla +
Flowering Mar–Apr.  +
Arabis caucasica +
Flowering Jun–Aug.  +
Arabis crucisetosa +
Flowering Apr–Jun.  +
Arabis eschscholtziana +
Flowering (Apr-)May–Jul.  +
Arabis furcata +
Flowering May–Jul(-Aug).  +
Arabis georgiana +
Flowering Mar–Apr.  +
Arabis mcdonaldiana +
Flowering May–Jun.  +
Arabis modesta +
Flowering Mar–Apr(-May).  +
Arabis nuttallii +
Flowering Apr–Aug.  +
Arabis olympica +
Flowering Aug.  +
Arabis oregana +
Flowering Apr–May.  +
Arabis patens +
Flowering Apr–May.  +
Arabis pycnocarpa var. adpressipilis +
Flowering Mar–Jun.  +
Arabis pycnocarpa var. pycnocarpa +
Flowering Mar–Jul.  +
Arbutus arizonica +
Flowering May–Jun(-Aug)  +, fruiting Aug–Oct.  +
Arbutus menziesii +
Flowering Mar–May(-Jun)  +, fruiting (Jun-)Jul–Sep (-Oct) (fruit sometimes held on the trees into early part of following year).  +
Arbutus xalapensis +
Flowering (Feb-)Mar–Apr(-May)  +, ripe fruit appears after about 6 weeks.  +
Arceuthobium americanum +
Flowering (Mar–)Apr–Jun  +, fruiting Aug–Sep.  +
Arceuthobium campylopodum subsp. abietinum +
Flowering Jul–Aug(–Sep)  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. apachecum +
Flowering Jul–Sep  +, fruiting Aug–Oct.  +
Arceuthobium campylopodum subsp. blumeri +
Flowering Jul–Aug  +, fruiting Aug–Oct.  +
Arceuthobium campylopodum subsp. californicum +
Flowering Jul–Aug  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. campylopodum +
Flowering Aug–Oct  +, fruiting Sep–Nov.  +
Arceuthobium campylopodum subsp. cyanocarpum +
Flowering Jul–Sep  +, fruiting Aug–Sep.  +
Arceuthobium campylopodum subsp. laricis +
Flowering Jul–Aug  +, fruiting (Aug–)Sep(–Oct).  +
Arceuthobium campylopodum subsp. littorum +
Flowering Aug–Sep  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. microcarpum +
Flowering (Jul–)Aug–Sep  +, fruiting (Aug–)Sep(–Oct).  +
Arceuthobium campylopodum subsp. monticola +
Flowering Jul–Aug  +, fruiting Oct–Nov.  +
Arceuthobium campylopodum subsp. occidentale +
Flowering Sep–Nov(–Dec)  +, fruiting (Sep–)Oct–Jan(–Feb).  +
Arceuthobium campylopodum subsp. siskiyouense +
Flowering Aug–Sep  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. tsugense +
Flowering Jul–Sep(–Oct)  +, fruiting (Aug–)Sep–Nov.  +
Arceuthobium divaricatum +
Flowering Aug–Sep  +, fruiting Sep–Oct.  +
Arceuthobium douglasii +
Flowering (Mar–)Apr–May(–Jun)  +, fruiting Aug–Sep(–Oct).  +
Arceuthobium gillii +
Flowering Feb–Apr  +, fruiting Oct.  +
Arceuthobium pusillum +
Flowering (Mar–)Apr–May(–Jun)  +, fruiting Sep–Oct.  +
Arceuthobium vaginatum subsp. cryptopodum +
Flowering (Apr–)May–Jun(–Jul)  +, fruiting Jul–Aug(–Sep).  +
Archidium alternifolium +
Capsules mature late fall to early spring (Nov–Mar).  +
Archidium donnellii +
Capsules mature early spring (Mar), more rarely in autumn or winter (Oct–Dec).  +
Archidium hallii +
Capsules mature early spring (Mar) or rarely late fall (Nov).  +
Archidium minus +
Capsules mature fall to spring (Sep–Apr).  +
Archidium ohioense +
Capsules mature fall through spring (Oct–May).  +
Archidium tenerrimum +
Capsules mature late fall to early spring (Oct–Mar).  +
Arctanthemum arcticum subsp. arcticum +
Flowering summer.  +
Arctanthemum arcticum subsp. polare +
Flowering summer.  +
Arctium lappa +
Flowering summer–early fall (Jul–Oct).  +
Arctium minus +
Flowering summer–early fall (Jul–Sep).  +
Arctium tomentosum +
Flowering summer–early fall (Jul–Oct).  +
Arctoa anderssonii +
Capsules mature summer.  +
Arctoa fulvella +
Capsules mature summer.  +
Arctoa hyperborea +
Capsules mature summer.  +
Arctomecon californica +
Flowering mid spring  +, fruiting early summer.  +
Arctomecon humilis +
Flowering late spring  +, fruiting mid summer.  +
Arctomecon merriamii +
Flowering mid spring  +, fruiting early summer.  +
Arctostaphylos andersonii +
Flowering winter–early spring.  +
Arctostaphylos auriculata +
Flowering winter–early spring.  +
Arctostaphylos bakeri subsp. bakeri +
Flowering winter–early spring.  +
Arctostaphylos bakeri subsp. sublaevis +
Flowering winter–early spring.  +
Arctostaphylos canescens subsp. canescens +
Flowering early winter–late spring.  +
Arctostaphylos canescens subsp. sonomensis +
Flowering early winter–late spring.  +
Arctostaphylos catalinae +
Flowering winter–early spring.  +
Arctostaphylos columbiana +
Flowering winter–early spring.  +
Arctostaphylos confertiflora +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. crinita +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. crustacea +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. eastwoodiana +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. insulicola +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. rosei +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. subcordata +
Flowering winter–early spring.  +
Arctostaphylos cruzensis +
Flowering winter–early spring.  +
Arctostaphylos densiflora +
Flowering winter–early spring.  +
Arctostaphylos edmundsii +
Flowering winter–early spring.  +
Arctostaphylos franciscana +
Flowering winter–early spring.  +
Arctostaphylos gabilanensis +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. adamsii +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. crassifolia +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. cushingiana +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. gabrielensis +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. glandulosa +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. howellii +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. leucophylla +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. mollis +
Flowering winter–early spring.  +
Arctostaphylos glauca +
Flowering winter–early spring.  +
Arctostaphylos glutinosa +
Flowering winter–early spring.  +
Arctostaphylos hispidula +
Flowering winter–early spring.  +
Arctostaphylos hookeri subsp. hearstiorum +
Flowering winter–early spring.  +
Arctostaphylos hookeri subsp. hookeri +
Flowering winter–early spring.  +
Arctostaphylos hooveri +
Flowering winter–early spring.  +
Arctostaphylos imbricata +
Flowering winter–early spring.  +
Arctostaphylos insularis +
Flowering winter–early spring.  +
Arctostaphylos klamathensis +
Flowering late spring.  +
Arctostaphylos luciana +
Flowering winter–early spring.  +
Arctostaphylos malloryi +
Flowering winter–late spring.  +
Arctostaphylos manzanita subsp. elegans +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. glaucescens +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. laevigata +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. manzanita +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. roofii +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. wieslanderi +
Flowering early–late spring.  +
Arctostaphylos mewukka subsp. mewukka +
Flowering late spring–early summer.  +
Arctostaphylos mewukka subsp. truei +
Flowering late spring–early summer.  +
Arctostaphylos montana subsp. montana +
Flowering late spring.  +
Arctostaphylos montana subsp. ravenii +
Flowering early–late spring.  +
Arctostaphylos montaraensis +
Flowering winter–early spring.  +
Arctostaphylos montereyensis +
Flowering winter–early spring.  +
Arctostaphylos morroensis +
Flowering winter–early spring.  +
Arctostaphylos myrtifolia +
Flowering winter–early spring.  +
Arctostaphylos nevadensis subsp. knightii +
Flowering late spring.  +
Arctostaphylos nevadensis subsp. nevadensis +
Flowering late spring.  +
Arctostaphylos nissenana +
Flowering winter–early spring.  +
Arctostaphylos nortensis +
Flowering late winter–late spring.  +
Arctostaphylos nummularia subsp. mendocinoensis +
Flowering winter–early spring.  +
Arctostaphylos nummularia subsp. nummularia +
Flowering winter–early spring.  +
Arctostaphylos obispoensis +
Flowering winter–early spring.  +
Arctostaphylos ohloneana +
Flowering winter–early spring.  +
Arctostaphylos osoensis +
Flowering winter–early spring.  +
Arctostaphylos otayensis +
Flowering winter–early spring.  +
Arctostaphylos pacifica +
Flowering winter–early spring.  +
Arctostaphylos pajaroensis +
Flowering early winter–early spring.  +
Arctostaphylos pallida +
Flowering winter–early spring.  +
Arctostaphylos parryana subsp. desertica +
Flowering winter–early spring.  +
Arctostaphylos parryana subsp. parryana +
Flowering late spring–early summer.  +
Arctostaphylos parryana subsp. tumescens +
Flowering early–late spring.  +
Arctostaphylos patula +
Flowering late spring–early summer.  +
Arctostaphylos pechoensis +
Flowering winter–early spring.  +
Arctostaphylos pilosula +
Flowering winter–early spring.  +
Arctostaphylos pringlei subsp. drupacea +
Flowering early–late spring.  +
Arctostaphylos pringlei subsp. pringlei +
Flowering early–late spring.  +
Arctostaphylos pumila +
Flowering winter–early spring.  +
Arctostaphylos pungens +
Flowering winter–early summer.  +
Arctostaphylos purissima +
Flowering winter–early spring.  +
Arctostaphylos rainbowensis +
Flowering winter–early spring.  +
Arctostaphylos refugioensis +
Flowering winter–early spring.  +
Arctostaphylos regismontana +
Flowering winter–early spring.  +
Arctostaphylos rudis +
Flowering winter–early spring.  +
Arctostaphylos sensitiva +
Flowering winter–early spring.  +
Arctostaphylos silvicola +
Flowering winter–early spring.  +
Arctostaphylos stanfordiana subsp. decumbens +
Flowering winter–early spring.  +
Arctostaphylos stanfordiana subsp. raichei +
Flowering winter–early spring.  +
Arctostaphylos stanfordiana subsp. stanfordiana +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. bracteosa +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. daciticola +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. hebeclada +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. tomentosa +
Flowering winter–early spring.  +
Arctostaphylos uva-ursi +
Flowering winter–early summer.  +
Arctostaphylos virgata +
Flowering early winter–early spring.  +
Arctostaphylos viridissima +
Flowering winter–early spring.  +
Arctostaphylos viscida subsp. mariposa +
Flowering winter–early spring.  +
Arctostaphylos viscida subsp. pulchella +
Flowering winter–early spring.  +
Arctostaphylos viscida subsp. viscida +
Flowering winter–early spring.  +
Arctotheca calendula +
Flowering Oct–Aug.  +
Arctotis fastuosa +
Flowering spring–summer.  +
Arctotis stoechadifolia +
Flowering (Jan–)Apr–Nov.  +
Arctous alpina +
Flowering early summer.  +
Arctous rubra +
Flowering summer.  +
Ardisia crenata +
Flowering May–Jun  +, fruiting Jul–Dec.  +
Ardisia elliptica +
Flowering Feb–Apr  +, fruiting Sep–Nov.  +
Ardisia escallonioides +
Flowering May–Jun  +, fruiting Nov–May.  +
Ardisia japonica +
Flowering Apr–Jun  +, fruiting Nov–Jan.  +
Arenaria benthamii +
Flowering late spring.  +
Arenaria humifusa +
Flowering spring–summer.  +
Arenaria lanuginosa var. lanuginosa +
Flowering spring–summer.  +
Arenaria lanuginosa var. saxosa +
Flowering spring–summer.  +
Arenaria livermorensis +
Flowering spring–summer.  +
Arenaria longipedunculata +
Flowering spring–summer.  +
Arenaria ludens +
Flowering late summer–early autumn.  +
Arenaria paludicola +
Flowering late spring–summer.  +
Arenaria pseudofrigida +
Flowering spring–summer.  +
Arenaria serpyllifolia var. serpyllifolia +
Flowering spring–summer.  +
Arenaria serpyllifolia var. tenuior +
Flowering spring–summer.  +
Arethusa bulbosa +
Flowering Jun–Jul.  +
Argemone aenea +
Flowering and fruiting early spring–summer.  +
Argemone albiflora subsp. albiflora +
Flowering early spring–summer  +, fruiting late spring–summer.  +
Argemone albiflora subsp. texana +
Flowering early spring–summer  +, fruiting spring–fall.  +
Argemone arizonica +
Flowering spring  +, fruiting summer.  +
Argemone aurantiaca +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone chisosensis +
Flowering and fruiting spring–fall.  +
Argemone corymbosa subsp. arenicola +
Flowering spring  +, fruiting spring–summer.  +
Argemone corymbosa subsp. corymbosa +
Flowering and fruiting spring.  +
Argemone gracilenta +
Flowering spring  +, fruiting spring–summer.  +
Argemone hispida +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone mexicana +
Flowering and fruiting spring–fall, or throughout year in tropics.  +
Argemone munita subsp. argentea +
Flowering spring  +, fruiting spring–summer.  +
Argemone munita subsp. munita +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone munita subsp. robusta +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone munita subsp. rotundata +
Flowering spring–fall  +, fruiting summer–fall.  +
Argemone ochroleuca +
Flowering and fruiting spring–fall.  +
Argemone pleiacantha subsp. ambigua +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone pleiacantha subsp. pinnatisecta +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone pleiacantha subsp. pleiacantha +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone polyanthemos +
Flowering spring–summer  +, fruiting late spring–summer.  +
Argemone sanguinea +
Flowering early spring–summer  +, fruiting spring–summer.  +
Argemone squarrosa subsp. glabrata +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone squarrosa subsp. squarrosa +
Flowering spring–summer  +, fruiting summer–fall.  +
Argyranthemum foeniculaceum +
Flowering May.  +
Argyrochosma dealbata +
Sporulating summer–fall.  +
Argyrochosma fendleri +
Sporulating summer–fall.  +
Argyrochosma incana +
Sporulating summer–fall.  +
Argyrochosma jonesii +
Sporulating spring–fall.  +
Argyrochosma limitanea subsp. limitanea +
Sporulating summer–fall.  +
Argyrochosma limitanea subsp. mexicana +
Sporulating summer–fall.  +
Argyrochosma microphylla +
Sporulating summer–fall.  +
Argythamnia adenophora +
Flowering Jan–Mar and Jul–Oct.  +
Argythamnia aphoroides +
Flowering Jan–Jul.  +
Argythamnia argothamnoides +
Flowering year-round.  +
Argythamnia argyraea +
Flowering Apr–Jul.  +
Argythamnia brandegeei var. intonsa +
Flowering year-round.  +
Argythamnia claryana +
Flowering Feb–Apr and Oct–Nov.  +
Argythamnia cyanophylla +
Flowering Mar–Jun and Aug–Oct.  +
Argythamnia humilis +
Flowering year-round.  +
Argythamnia lanceolata +
Flowering year-round.  +
Argythamnia mercurialina var. mercurialina +
Flowering Mar–Aug.  +
Argythamnia mercurialina var. pilosissima +
Flowering from Mar–Jul.  +
Argythamnia serrata +
Flowering year-round.  +
Argythamnia simulans +
Flowering Mar–Nov.  +
Arida arizonica +
Flowering Mar–Nov.  +
Arida blepharophylla +
Flowering Sep–Oct.  +
Arida carnosa +
Flowering Aug–Sep.  +
Arida mattturneri +
Flowering Apr–Jul.  +
Arida parviflora +
Flowering Jul–Oct.  +
Arida riparia +
Flowering Apr–Sep.  +
Ariocarpus fissuratus var. fissuratus +
Flowering Sep–Nov.  +
Arisaema dracontium +
Flowering late winter (southern part of range)–late spring.  +
Arisaema triphyllum +
Flowering early–late spring.  +
Aristocapsa insignis +
Flowering May–Jun.  +
Aristolochia californica +
Flowering spring.  +
Aristolochia clematitis +
Flowering summer.  +
Aristolochia coryi +
Flowering late spring–summer.  +