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Isocoma menziesii
Isocoma menziesii var. sedoides, Isocoma menziesii var. vernonioides (Hooker & Arnott) G. L. Nesom Phytologia 70: 93. 1991. Guy L. Nesom Common names: Pacific

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Centromadia pungens
concern Basionym: Hartmannia pungens Hooker & Arnott Bot. Beechey Voy., 357. 1839 Synonyms: Hemizonia pungens (Hooker & Arnott) Torrey & A. Gray Treatment appears

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Clarkia speciosa
Oenothera viminea var. parviflora Hooker & Arnott Bot. Beechey Voy., 342. 1839 Synonyms: Godetia parviflora (Hooker & Arnott) Jepson Treatment appears in FNA

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Hazardia squarrosa
Hazardia squarrosa var. obtusa, Hazardia squarrosa var. squarrosa (Hooker & Arnott) Greene Erythea 2: 112. 1894. W. Dennis Clark Common names: Saw-tooth

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Calycanthus occidentalis
familyCalycanthaceae genusCalycanthus speciesCalycanthus occidentalis Hooker & Arnott Bot. Beechey Voy., 340, plate 84. 1841. George P. Johnson Common names:

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Layia
munzii, Layia pentachaeta, Layia platyglossa, Layia septentrionalis Hooker & Arnott ex de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr

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Erigeron concinnus
Basionym: Distasis concinna Hooker & Arnott Bot. Beechey Voy., 350. 1839 Synonyms: E. pumilus var. concinnus (Hooker & Arnott) Dorn Treatment appears in

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Anemopsis
familySaururaceae genusAnemopsis Show Lower Taxa Anemopsis californica Hooker & Arnott Bot. Beechey Voy., 390. 1841. George F. Buddell II, John W. Thieret

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Lithocarpus densiflorus
densiflorus var. densiflorus, Lithocarpus densiflorus var. echinoides (Hooker & Arnott) Rehder in L. H. Bailey, Stand. Cycl. Hort. 6: 3569. 1917. Kevin C.

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Umbellularia californica
californica var. californica, Umbellularia californica var. fresnensis (Hooker & Arnott) Nuttall N. Amer. Sylv. 1: 87. 1842. Henk van der Werff Common names:

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Adenostoma
genusAdenostoma Show Lower Taxa Adenostoma fasciculatum, Adenostoma sparsifolium Hooker & Arnott Bot. Beechey Voy., 139. 1832. William Jones, James Henrickson Common

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Amblyopappus
Baeriinae genusAmblyopappus Show Lower Taxa Amblyopappus pusillus Hooker & Arnott J. Bot. (Hooker) 3: 321. 1841. John L. Strother Etymology: Greek ambly -, blunt

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Alsia californica
californica (Hooker & Arnott) Sullivant Proc. Amer. Acad. Arts 3: 185. 1855. Clayton C. Newberry Illustrated Basionym: Neckera californica Hooker & Arnott Bot.

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Adenostoma fasciculatum
fasciculatum var. obtusifolium, Adenostoma fasciculatum var. prostratum Hooker & Arnott Bot. Beechey Voy., 139. 1832. William Jones, James Henrickson Common

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Anemopsis californica
(Nuttall) Hooker & Arnott Bot. Beechey Voy., 390. 1840. George F. Buddell II, John W. Thieret Illustrated Basionym: Anemia californica (Nuttall) Hooker & Arnott

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Atamisquea
familyCapparaceae genusAtamisquea Show Lower Taxa Atamisquea emarginata Miers ex Hooker & Arnott Bot. Misc. 3: 142. 1833. Gordon C. Tucker Etymology: For Atamisco region

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Prunus ilicifolia
ilicifolia var. ilicifolia, Prunus ilicifolia var. occidentalis (Nuttall ex Hooker & Arnott) D. Dietrich Syn. Pl. 3: 43. 1842. Joseph R. Rohrer Common names: Hollyleaf

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Polypodium calirhiza
Basionym: Polypodium intermedium Hooker & Arnott 1840, Synonyms: Polypodium vulgare var. intermedium (Hooker & Arnott) Fernald Treatment appears in FNA

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Castilleja ambigua
Castilleja ambigua var. insalutata, Castilleja ambigua var. meadii Hooker & Arnott Bot. Beechey Voy., 154. 1833. J. Mark Egger, Peter F. Zika, Barbara

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Atamisquea emarginata
familyCapparaceae genusAtamisquea speciesAtamisquea emarginata Miers ex Hooker & Arnott Bot. Misc. 3: 143. 1833. Gordon C. Tucker Common names: Palo-zorillo

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Amblyopappus pusillus
subtribe Baeriinae genusAmblyopappus speciesAmblyopappus pusillus Hooker & Arnott J. Bot. (Hooker) 3: 321. 1841. John L. Strother Illustrated Treatment appears

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Umbellularia californica var. californica
speciesUmbellularia californica varietyUmbellularia californica var. californica (Hooker & Arnott) Nuttall Henk van der Werff Illustrated Treatment appears in FNA Volume

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Acmella pusilla
pusilla (Hooker & Arnott) R. K. Jansen Syst. Bot. Monogr. 8: 46. 1985. John L. Strother Introduced Basionym: Spilanthes pusilla Hooker & Arnott J. Bot.

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Castilleja affinis
Castilleja affinis var. contentiosa, Castilleja affinis var. neglecta Hooker & Arnott Bot. Beechey Voy., 154. 1833. J. Mark Egger, Peter F. Zika, Barbara

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Ribes californicum
Ribes californicum var. californicum, Ribes californicum var. hesperium Hooker & Arnott Bot. Beechey Voy., 346. 1839 ,. Nancy R. Morin Common names: Hillside

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Chaenactis douglasii
Chaenactis douglasii var. alpina, Chaenactis douglasii var. douglasii (Hooker) Hooker & Arnott Bot. Beechey Voy., 354. 1839. James D. Morefield Common names: Hoary

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Anoda lanceolata
subfamilyMalvaceae subfam. Malvoideae genusAnoda speciesAnoda lanceolata Hooker & Arnott Bot. Beechey Voy., 411. 1840. Paul A. Fryxell†, Steven R. Hill Synonyms:

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Orthocarpus tolmiei
Orthocarpus tolmiei subsp. holmgreniorum, Orthocarpus tolmiei subsp. tolmiei Hooker & Arnott Bot. Beechey Voy., 379. 1839. Kerry A. Barringer Endemic Treatment appears

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Grayia
AL familyChenopodiaceae genusGrayia Show Lower Taxa Grayia spinosa Hooker & Arnott Bot. Beechey Voy., 387. 1841. Noel H. Holmgren Common names: Hopsage

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Isolepis carinata
carinata Hooker & Arnott ex Torrey Ann. Lyceum Nat. Hist. New York 3: 349. 1836. S. Galen Smith IllustratedEndemic Basionym: Scirpus carinatus (Hooker & Arnott

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Ericameria ericoides
ericoides Lessing Linnaea 6: 117. 1831 Synonyms: Haplopappus ericoides (Lessing) Hooker & Arnott Haplopappus ericoides subsp. blakei C. B. Wolf Treatment appears in

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Oemleria
pharmacist and entomologist Basionym: Nuttallia Torrey & A. Gray ex Hooker & Arnott Bot. Beechey Voy., 336. 1839, Treatment appears in FNA Volume 9. Treatment

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Allium falcifolium
LAYOUT:treatment:TUOYAL familyLiliaceae genusAllium speciesAllium falcifolium Hooker & Arnott Bot. Beechey Voy., 400. 1841. Dale W. McNeal Jr., T. D. Jacobsen IllustratedEndemic

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Arabis blepharophylla
tribeBrassicaceae tribe Arabideae genusArabis speciesArabis blepharophylla Hooker & Arnott Bot. Beechey Voy., 321. 1838. Ihsan A. Al-Shehbaz IllustratedEndemic

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Sphaeralcea grossulariifolia
grossulariifolia Hooker & Arnott Bot. Beechey Voy., 326. 1838 (as grossulariaefolia) Synonyms: Malvastrum coccineum var. grossulariifolium (Hooker & Arnott) Torrey

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Lithophragma heterophyllum
familySaxifragaceae genusLithophragma speciesLithophragma heterophyllum (Hooker & Arnott) Hooker & Arnott in J. Torrey and A. Gray, Fl. N. Amer. 1: 584. 1840 (as heterophylla)

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Ranunculus hebecarpus
Ranunculus sectionRanunculus sect. Echinella speciesRanunculus hebecarpus Hooker & Arnott Bot. Beechey Voy., 316. 1838. Alan T. Whittemore Illustrated Treatment

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Antigonon leptopus
subfamilyPolygonaceae subfam. Polygonoideae genusAntigonon speciesAntigonon leptopus Hooker & Arnott Bot. Beechy Voy., 308, plate 69. 1838. Craig C. Freeman Common names:

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Trillium chloropetalum var. giganteum
giganteum (Hooker & Arnott) Munz Aliso 4: 88. 1958. Frederick W. Case Jr. Endemic Basionym: Trillium sessile var. giganteum Hooker & Arnott Bot. Beechey

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Ranunculus bonariensis var. trisepalus
(Gillies ex Hooker & Arnott) Lourteig Darwiniana 9: 465. 1951. Alan T. Whittemore Basionym: Ranunculus trisepalus Gillies ex Hooker & Arnott Bot. Misc.

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Ludwigia hexapetala
Jussiaeahexapetala hooker & Arnott Bot. Misc. 3: 312. 1833 Synonyms: J. repens var. major Hassler Ludwigia grandiflora subsp. hexapetala (Hooker & Arnott) G. L. Nesom

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Cercocarpus betuloides var. betuloides
macrourus (Rydberg) Jepson C. douglasii Rafinesque C. macrourus Nuttall ex Hooker & Arnott C. minutiflorus Rydberg C. montanus var. glaber (S. Watson) F. L. Martin

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Penstemon laricifolius
laricifolius var. exilifolius, Penstemon laricifolius var. laricifolius Hooker & Arnott Bot. Beechey Voy., 376. 1839. (as Pentstemon) Craig C. Freeman Common

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Layia gaillardioides
Heliantheae) subtribe Madiinae genusLayia speciesLayia gaillardioides (Hooker & Arnott) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr

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Mentzelia micrantha
genusMentzelia sectionMentzelia sect. Trachyphytum speciesMentzelia micrantha (Hooker & Arnott) Torrey & A. Gray Fl. N. Amer. 1: 535. 1840. Joshua M. Brokaw Common

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Corethrogyne filaginifolia
tribe Astereae genusCorethrogyne speciesCorethrogyne filaginifolia (Hooker & Arnott) Nuttall Trans. Amer. Philos. Soc., n. s. 7: 290. 1841. Staci Markos

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Diplacus nanus
LAYOUT:treatment:TUOYAL familyPhrymaceae genusDiplacus speciesDiplacus nanus (Hooker & Arnott) G. L. Nesom Phytoneuron 2012-39: 29. 2012. Guy L. Nesom, Melissa C

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Ceanothus integerrimus
genusCeanothus subgenusCeanothus subg. Ceanothus speciesCeanothus integerrimus Hooker & Arnott Bot. Beechey Voy., 329. 1838. Clifford L. Schmidt†, Dieter H. Wilken

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Cervantesiaceae
endocarp, these are considered pseudodrupes, not true drupes. In Jodina Hooker & Arnott ex Meisner, the endocarp is apparently consumed during endosperm development

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Dicentra chrysantha
chrysantha (Hooker & Arnott) Walpers Repert. Bot. Syst. 1: 118. 1842. Kingsley R. Stern Common names: Golden eardrops Basionym: Dielytra chrysantha Hooker & Arnott

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Eremothera boothii subsp. decorticans
decorticans (Hooker & Arnott) Jepson O. boothii subsp. decorticans (Hooker & Arnott) Munz O. boothii subsp. rutila (Davidson) Munz O. decorticans (Hooker & Arnott)

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Myriophyllum aquaticum
Myriophyllum brasiliense Cambessèdes M. proserpinacoides Gillies ex Hooker & Arnott Treatment appears in FNA Volume 10. Illustrator: Copyright: Herbs dioecious

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Quercus douglasii
genusQuercus sectionQuercus sect. Quercus speciesQuercus douglasii Hooker & Arnott Bot. Beechey Voy. 9: 391. 1840. Kevin C. Nixon Common names: Blue oak

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Eremothera boothii subsp. alyssoides
Holostigma alyssoides (Hooker & Arnott) Hooker O. alyssoides var. villosa S. Watson O. boothii subsp. alyssoides (Hooker & Arnott) Munz O. gauriflora var

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Layia heterotricha
subtribe Madiinae genusLayia speciesLayia heterotricha (de Candolle) Hooker & Arnott Bot. Beechey Voy., 358. 1839. Bruce G. Baldwin, Susan J. Bainbridge

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Carex gmelinii
familyCyperaceae genusCarex sectionCarex sect. Racemosae speciesCarex gmelinii Hooker & Arnott Bot. Beechey Voy., 118, plate 27. 1832. David F. Murray Illustrated

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Odontostomum hartwegii
Jun). Habitat: Grassland, savanna with blue oak (Quercus douglasii Hooker & Arnott) or digger pine (Pinus sabiniana Douglas ex D. Don), usually in well-drained

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Tetrapteron graciliflorum
graciliflora Hooker & Arnott Bot. Beechey Voy., 341. 1839 Synonyms: Camissonia graciliflora (Hooker & Arnott) P. H. Raven Taraxia graciliflora (Hooker & Arnott)

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Neogaerrhinum strictum
Maurandya stricta Hooker & Arnott Bot. Beechy Voy., 375. 1839 Synonyms: Antirrhinum hookerianum Pennell ex Millspaugh Asarina stricta (Hooker & Arnott) Pennell

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Layia glandulosa
Heliantheae) subtribe Madiinae genusLayia speciesLayia glandulosa (Hooker) Hooker & Arnott Bot. Beechey Voy., 358. 1839. Bruce G. Baldwin, Susan J. Bainbridge

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Lasthenia sect. Lasthenia
ranges from southwestern Washington to central California; L. kunthii Hooker & Arnott is known only from central Chile (P. H. Raven 1963c). The species are

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Lithophragma bolanderi
heterophyllum var. scabrellum (Greene) Jepson Lithophragma scabrellum Hooker & Arnott Lithophragma scabrellum var. peirsonii Jepson Tellima heterophylla var

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Layia hieracioides
subtribe Madiinae genusLayia speciesLayia hieracioides (de Candolle) Hooker & Arnott Bot. Beechey Voy., 358. 1839. Bruce G. Baldwin, Susan J. Bainbridge

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Horkelia fusca var. parviflora
parviflora Nuttall ex Hooker & Arnott Bot. Beechey Voy., 338. 1839 Synonyms: H. fusca subsp. parviflora (Nuttall ex Hooker & Arnott) D. D. Keck Potentilla

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Oenothera cespitosa subsp. marginata
cespitosa subspeciesOenothera cespitosa subsp. marginata (Nuttall ex Hooker & Arnott) Munz in N. L. Britton et al. N. Amer. Fl., ser. 2, 5: 101. 1965. (as

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Sidalcea malachroides
Basionym: Malva malachroides Hooker & Arnott Bot. Beechey Voy., 326. 1838 Synonyms: Hesperalcea malachroides (Hooker & Arnott) Greene Sidalcea vitifolia A

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Malvella leprosa
hederacea Douglas M. sulphurea Gillies ex Hooker & Arnott Malvastrum sulphureum (Gillies ex Hooker & Arnott) Grisebach Sida hederacea (Douglas) Torrey

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Enemion occidentale
LAYOUT:treatment:TUOYAL familyRanunculaceae genusEnemion speciesEnemion occidentale (Hooker & Arnott) J. R. Drummond & Hutchinson Bull. Misc. Inform. Kew 1920: 160. 1920

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Ceanothus oliganthus var. sorediatus
speciesCeanothus oliganthus varietyCeanothus oliganthus var. sorediatus (Hooker & Arnott) Hoover Leafl. W. Bot. 10: 349. 1966. Clifford L. Schmidt†, Dieter H

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Caulanthus lasiophyllus
lasiophyllus (Hooker & Arnott) Payson Ann. Missouri Bot. Gard. 9: 303. 1923. Ihsan A. Al-Shehbaz Basionym: Turritis lasiophylla Hooker & Arnott Bot. Beechey

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Grindelia hirsutula
tribeAsteraceae tribe Astereae genusGrindelia speciesGrindelia hirsutula Hooker & Arnott Bot. Beechey Voy., 147. 1833. John L. Strother, Mark A. Wetter Endemic

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Chaenactis stevioides
genusChaenactis sectionChaenactis sect. Chaenactis speciesChaenactis stevioides Hooker & Arnott Bot. Beechey Voy., 353. 1839. James D. Morefield Common names: Desert

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Kallstroemia maxima
familyZygophyllaceae genusKallstroemia speciesKallstroemia maxima (Linnaeus) Hooker & Arnott Bot. Beechey Voy., 282. 1838. Duncan M. Porter Basionym: Tribulus maximus Linnaeus

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Holozonia filipes
Heliantheae) subtribe Madiinae genusHolozonia speciesHolozonia filipes (Hooker & Arnott) Greene Bull Torrey Bot. Club 9: 122. 1882. Bruce G. Baldwin, John L

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Logfia filaginoides
tribeAsteraceae tribe Gnaphalieae genusLogfia speciesLogfia filaginoides (Hooker & Arnott) Morefield Novon 14: 473. 2004. James D. Morefield Common names: California

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Schkuhria multiflora
subtribe Chaenactidinae genusSchkuhria speciesSchkuhria multiflora Hooker & Arnott J. Bot. (Hooker) 3: 322. 1841. John L. Strother Synonyms: Bahia neomexicana (A

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Xanthium spinosum
cocklebur clotbur lampourde épineuse Synonyms: Xanthium ambrosioides Hooker & Arnott Xanthium spinosum var. inerme Bel Treatment appears in FNA Volume 21

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Tetradymia spinosa
tribeAsteraceae tribe Senecioneae genusTetradymia speciesTetradymia spinosa Hooker & Arnott Bot. Beechey Voy., 360. 1839. John L. Strother IllustratedEndemic Treatment

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Hemizonia congesta subsp. lutescens
congesta subsp. vernalis (D. D. Keck) Tanowitz Hemizonia lutescens Hooker & Arnott Hemizonia luzulifolia var. citrina (Greene) Jepson Hemizonia multicaulis

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Calochortus uniflorus
LAYOUT:treatment:TUOYAL familyLiliaceae genusCalochortus speciesCalochortus uniflorus Hooker & Arnott Bot. Beechey Voy., 398, plate 94. 1840. P. L. Fiedler, R. K. Zebell

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Erigeron velutipes
tribeAsteraceae tribe Astereae genusErigeron speciesErigeron velutipes Hooker & Arnott Bot. Beechey Voy., 434. 1841. Guy L. Nesom Common names: Delicate fleabane

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Oxalis laxa
LAYOUT:treatment:TUOYAL familyOxalidaceae genusOxalis speciesOxalis laxa Hooker & Arnott Bot. Beechey Voy., 13. 1830. Guy L. Nesom Common names: Dwarf wood-sorrel

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Calochortus tolmiei
LAYOUT:treatment:TUOYAL familyLiliaceae genusCalochortus speciesCalochortus tolmiei Hooker & Arnott Bot. Beechey Voy., 398. 1840. P. L. Fiedler, R. K. Zebell Common names:

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Lepidium nitidum
Al-Shehbaz, John F. Gaskin WeedyIllustrated Synonyms: Lepidium leiocarpum Hooker & Arnott Lepidium nitidum var. howellii C. L. Hitchcock Lepidium nitidum var

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Ludwigia grandiflora
grandiflora (Michaux) Micheli J. repens var. hispida Hauman J. stenophylla Gillies ex Hooker & Arnott J. stuckertii H. Léveillé J. uruguayensis Cambessèdes Ludwigia clavellina

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Crataegus opaca
seriesCrataegus (sect. Coccineae) ser. Aestivales speciesCrataegus opaca Hooker & Arnott Compan. Bot. Mag. 1: 25. 1835. James B. Phipps Common names: Western

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Talinopsis
to representatives of Anacampseros Linnaeus and Grahamia Gillies ex Hooker & Arnott (as originally suggested by A. Gray), in a clade not far removed from

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Ludwigia sect. Pterocaulon
that name was pre-occupied by Diplandra Bertero 1830 and Diplandra Hooker & Arnott 1838, name conserved. None. Ludwigia decurrens, Ludwigia erecta window

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Cayaponia
Although these observations pertain directly only to C. attenuata (Hooker & Arnott) Cogniaux, they perhaps also apply to the two species included here

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Sisymbrium linifolium
Nat. Sci. Philadelphia 7: 12. 1834 Synonyms: Erysimum glaberrimum Hooker & Arnott Erysimum linifolium (Nuttall) M. E. Jones Nasturtium pumilum Nuttall

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Rorippa teres
tanacetifolium de Candolle Nasturtium tanacetifolium (de Candolle) Hooker & Arnott Nasturtium walteri (Elliott) Alph. Wood Rorippa obtusa (Nuttall) Britton

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Draba ramosissima
Endemic Synonyms: Alyssum dentatum Nuttall Draba dentata (Nuttall) Hooker & Arnott Draba ramosissima var. glabrifolia E. L. Braun Treatment appears in

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Castilleja foliolosa
AL familyOrobanchaceae genusCastilleja speciesCastilleja foliolosa Hooker & Arnott Bot. Beechey Voy., 154. 1833. J. Mark Egger, Peter F. Zika, Barbara

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Castilleja latifolia
AL familyOrobanchaceae genusCastilleja speciesCastilleja latifolia Hooker & Arnott Bot. Beechey Voy., 154. 1833. J. Mark Egger, Peter F. Zika, Barbara

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Gayophytum
the central and southern Sierra Nevada). One species, G. micranthum Hooker & Arnott, is endemic to southern South America in Argentina and Chile, and one

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Lepidium montanum
Lepidium alyssoides var. stenocarpum Thellung Lepidium brachybotryum Hooker & Arnott Lepidium corymbosum Rydberg Lepidium crandallii Nuttall Lepidium integrifolium

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Senecio
J. Uttal (1982), both of whom treated it as Senecio canabinaefolius Hooker & Arnott. It is toxic to livestock; it seems not to have persisted in the flora

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Pluchea sericea
integrifolia appears to be T. absinthoides (Hooker & Arnott) Cabrera [= Pluchea absinthoides (Hooker & Arnott) H. Robinson & Cuatrecasas]. Both species have

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Koenigia islandica
bipolar distribution (e.g., Anemone multifida Poiret, Osmorhiza chilensis Hooker & Arnott, and Carex macloviana D’Urville). None. None. window.propertiesFrom

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Delphinium nudicaule
D. nudicaule represents plants (synonyms D. sarcophyllum Hooker & Arnott and D. peltatum Hooker, an invalid name) grown under very moist conditions, probably

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