| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ARAM3 | Arnica amplexifolia Rydb. | Arnica amplexicaulis | Asteraceae
|
| ARANA | Arnica angustifolia Vahl ssp. angustifolia | narrowleaf arnica | Asteraceae
|
| ARANA2 | Arnica angustifolia Vahl ssp. attenuata (Greene) G.W. Douglas | Arnica angustifolia ssp. angustifolia | Asteraceae
|
| ARANL | Arnica angustifolia Vahl ssp. lonchophylla (Greene) G.W. Douglas & G. Ruyle-Douglas | Arnica lonchophylla ssp. lonchophylla | Asteraceae
|
| ARANT | Arnica angustifolia Vahl ssp. tomentosa (Macoun) G.W. Douglas & G. Ruyle-Douglas | narrowleaf arnica | Asteraceae
|
| ARAN5 | Arnica angustifolia Vahl | narrowleaf arnica | Asteraceae
|
| ARAR11 | Arnica arnoglossa Greene | Arnica lonchophylla ssp. arnoglossa | Asteraceae
|
| ARBE4 | Arnica bernardina Greene | Arnica chamissonis ssp. foliosa var. bernardina | Asteraceae
|
| ARCA25 | Arnica cascadensis St. John | Arnica rydbergii | Asteraceae
|
| ARCE | Arnica cernua T.J. Howell | serpentine arnica | Asteraceae
|
| ARCHC2 | Arnica chamissonis Less. ssp. chamissonis var. chamissonis | Chamisso arnica | Asteraceae
|
| ARCHI3 | Arnica chamissonis Less. ssp. chamissonis var. interior Maguire | Chamisso arnica | Asteraceae
|
| ARCHC | Arnica chamissonis Less. ssp. chamissonis | Chamisso arnica | Asteraceae
|
| ARCHA2 | Arnica chamissonis Less. ssp. foliosa (Nutt.) Maguire var. andina (Nutt.) Ediger & Barkl. | Chamisso arnica | Asteraceae
|
| ARCHB2 | Arnica chamissonis Less. ssp. foliosa (Nutt.) Maguire var. bernardina (Greene) Maguire | Chamisso arnica | Asteraceae
|
| ARCHI4 | Arnica chamissonis Less. ssp. foliosa (Nutt.) Maguire var. incana (Gray) Hult�n | Chamisso arnica | Asteraceae
|
| ARCHM2 | Arnica chamissonis Less. ssp. foliosa (Nutt.) Maguire var. maguirei (A. Nels.) Maguire | Chamisso arnica | Asteraceae
|
| ARCHF | Arnica chamissonis Less. ssp. foliosa (Nutt.) Maguire | Chamisso arnica | Asteraceae
|
| ARCHG | Arnica chamissonis Less. ssp. genuina Maguire | Arnica chamissonis ssp. chamissonis var. chamissonis | Asteraceae
|
| ARCHI5 | Arnica chamissonis Less. ssp. incana (Gray) Maguire | Arnica chamissonis ssp. foliosa var. incana | Asteraceae
|
| ARCHF2 | Arnica chamissonis Less. var. foliosa (Nutt.) Maguire | Arnica chamissonis ssp. foliosa var. andina | Asteraceae
|
| ARCHJ | Arnica chamissonis Less. var. jepsoniana Maguire | Arnica chamissonis ssp. foliosa var. andina | Asteraceae
|
| ARCH3 | Arnica chamissonis Less. | Chamisso arnica | Asteraceae
|
| ARCH6 | Arnica chandleri Rydb. | Arnica cernua | Asteraceae
|
| ARCH7 | Arnica chionopappa Fern. | Arnica lonchophylla ssp. lonchophylla | Asteraceae
|
| ARCOG2 | Arnica cordifolia Hook. ssp. genuina Maguire | Arnica cordifolia | Asteraceae
|
| ARCOH | Arnica cordifolia Hook. var. humilis (Rydb.) Maguire | Arnica cordifolia | Asteraceae
|
| ARCOP2 | Arnica cordifolia Hook. var. pumila (Rydb.) Maguire | Arnica cordifolia | Asteraceae
|
| ARCOW2 | Arnica cordifolia Hook. var. whitneyi (Fern.) Maguire | Arnica cordifolia | Asteraceae
|
| ARCO9 | Arnica cordifolia Hook. | heartleaf arnica | Asteraceae
|
| ARCU4 | Arnica cusickii Rydb. | Arnica spathulata | Asteraceae
|
| ARDIA2 | Arnica discoidea Benth. var. alata (Rydb.) Cronq. | Arnica discoidea | Asteraceae
|
| ARDIE | Arnica discoidea Benth. var. eradiata (Gray) Cronq. | Arnica discoidea | Asteraceae
|
| ARDI6 | Arnica discoidea Benth. | rayless arnica | Asteraceae
|
| ARDI7 | Arnica �diversifolia Greene (pro sp.) | rayless arnica | Asteraceae
|
| ARFOI | Arnica foliosa Nutt. var. incana Gray | Arnica chamissonis ssp. foliosa var. incana | Asteraceae
|
| ARFO2 | Arnica foliosa Nutt. | Arnica chamissonis ssp. foliosa var. andina | Asteraceae
|
| ARFRG2 | Arnica frigida C.A. Mey. ex Iljin var. glandulosa Boivin | Arnica frigida | Asteraceae
|
| ARFR2 | Arnica frigida C.A. Mey. ex Iljin | snow arnica | Asteraceae
|
| ARFUS | Arnica fulgens Pursh var. sororia (Greene) G.W. Douglas & G. Ruyle-Douglas | Arnica sororia | Asteraceae
|
| ARFU3 | Arnica fulgens Pursh | foothill arnica | Asteraceae
|
| ARGA | Arnica gaspensis Fern. | Arnica lonchophylla ssp. lonchophylla | Asteraceae
|
| ARGR14 | Arnica gracilis Rydb. | smallhead arnica | Asteraceae
|
| ARGR12 | Arnica grayi Heller | Arnica discoidea | Asteraceae
|
| ARGRF | Arnica griscomii Fern. ssp. frigida (C.A. Mey. ex Iljin) S.J. Wolf | Arnica frigida | Asteraceae
|
| ARHA5 | Arnica hardinae St. John | Arnica cordifolia | Asteraceae
|
| ARHU7 | Arnica humilis Rydb. | Arnica cordifolia | Asteraceae
|
| ARLA7 | Arnica lanceolata Nutt. | lanceleaf arnica | Asteraceae
|
| ARLAA3 | Arnica latifolia Bong. var. angustifolia Herder | Arnica latifolia | Asteraceae
|
| ARLAG | Arnica latifolia Bong. var. gracilis (Rydb.) Cronq. | Arnica gracilis | Asteraceae
|
| ARLA8 | Arnica latifolia Bong. | broadleaf arnica | Asteraceae
|
| ARLEN | Arnica lessingii (Torr. & Gray) Greene ssp. norbergii Hult�n & Maguire | Arnica lessingii | Asteraceae
|
| ARLE2 | Arnica lessingii (Torr. & Gray) Greene | nodding arnica | Asteraceae
|
| ARLOA | Arnica lonchophylla Greene ssp. arnoglossa (Greene) Maguire | seep arnica | Asteraceae
|
| ARLOC | Arnica lonchophylla Greene ssp. chionopappa (Fern.) Maguire | Arnica lonchophylla ssp. lonchophylla | Asteraceae
|
| ARLOL | Arnica lonchophylla Greene ssp. lonchophylla | longleaf arnica | Asteraceae
|
| ARLOA2 | Arnica lonchophylla Greene var. arnoglossa (Greene) Boivin | Arnica lonchophylla ssp. arnoglossa | Asteraceae
|
| ARLO5 | Arnica lonchophylla Greene | longleaf arnica | Asteraceae
|
| ARLOG5 | Arnica longifolia D.C. Eat. ssp. genuina Maguire | Arnica longifolia | Asteraceae
|
| ARLOM2 | Arnica longifolia D.C. Eat. ssp. myriadenia (Piper) Maguire | Arnica longifolia | Asteraceae
|
| ARLO6 | Arnica longifolia D.C. Eat. | spearleaf arnica | Asteraceae
|
| ARLOF | Arnica louiseana Farr ssp. frigida (C.A. Mey. ex Iljin) Maguire | Arnica frigida | Asteraceae
|
| ARLOB | Arnica louiseana Farr var. brevifolia (Rydb.) Maguire | Arnica frigida | Asteraceae
|
| ARLOF2 | Arnica louiseana Farr var. frigida (C.A. Mey. ex Iljin) Welsh | Arnica frigida | Asteraceae
|
| ARLOI | Arnica louiseana Farr var. illiamnae (Rydb.) Maguire | Arnica frigida | Asteraceae
|
| ARLOM | Arnica louiseana Farr var. mendenhallii (Rydb.) Maguire | Arnica frigida | Asteraceae
|
| ARLOP | Arnica louiseana Farr var. pilosa Maguire | Arnica frigida | Asteraceae
|
| ARMOA | Arnica mollis Hook. var. aspera (Greene) Boivin | Arnica amplexicaulis | Asteraceae
|
| ARMOP | Arnica mollis Hook. var. petiolaris Fern. | Arnica lanceolata | Asteraceae
|
| ARMOS | Arnica mollis Hook. var. silvatica (Greene) Maguire | Arnica mollis | Asteraceae
|
| ARMO4 | Arnica mollis Hook. | hairy arnica | Asteraceae
|
| ARMO8 | Arnica montana L. | mountain arnica | Asteraceae
|
| ARNE3 | Arnica nevadensis Gray | Nevada arnica | Asteraceae
|
| ARPA12 | Arnica paniculata A. Nels. | Arnica cordifolia | Asteraceae
|
| ARPAG | Arnica parryi Gray ssp. genuina Maguire | Arnica parryi ssp. parryi | Asteraceae
|
| ARPAP3 | Arnica parryi Gray ssp. parryi | Parry's arnica | Asteraceae
|
| ARPAS2 | Arnica parryi Gray ssp. sonnei (Greene) Maguire | Sonne's arnica | Asteraceae
|
| ARPAS | Arnica parryi Gray var. sonnei (Greene) Cronq. | Arnica parryi ssp. sonnei | Asteraceae
|
| ARPA13 | Arnica parryi Gray | Parry's arnica | Asteraceae
|
| ARPAA | Arnica parviflora Gray ssp. alata (Rydb.) Maguire | Arnica discoidea | Asteraceae
|
| ARPA25 | Arnica parviflora Gray | Arnica discoidea | Asteraceae
|
| ARPL6 | Arnica plantaginea Pursh | Arnica angustifolia ssp. angustifolia | Asteraceae
|
| ARRY | Arnica rydbergii Greene | Rydberg's arnica | Asteraceae
|
| ARSN | Arnica snyderi Raup | Arnica frigida | Asteraceae
|
| ARSO4 | Arnica sonnei Greene | Arnica parryi ssp. sonnei | Asteraceae
|
| ARSO3 | Arnica sornborgeri Fern. | Arnica angustifolia ssp. angustifolia | Asteraceae
|
| ARSO2 | Arnica sororia Greene | twin arnica | Asteraceae
|
| ARSPE2 | Arnica spathulata Greene ssp. eastwoodiae (Rydb.) Maguire | Arnica spathulata | Asteraceae
|
| ARSPE | Arnica spathulata Greene var. eastwoodiae (Rydb.) Ediger & Barkl. | Arnica spathulata | Asteraceae
|
| ARSP4 | Arnica spathulata Greene | Klamath arnica | Asteraceae
|
| ARTE6 | Arnica terrae-novae Fern. | Arnica angustifolia ssp. angustifolia | Asteraceae
|
| ARTO4 | Arnica tomentella Greene | Arnica nevadensis | Asteraceae
|
| ARTO5 | Arnica tomentosa Macoun | Arnica angustifolia ssp. tomentosa | Asteraceae
|
| ARUN | Arnica unalaschcensis Less. | Alaska arnica | Asteraceae
|
| ARVE | Arnica venosa Hall | Shasta County arnica | Asteraceae
|
| ARVI6 | Arnica viscosa Gray | Mt. Shasta arnica | Asteraceae
|
| ARWH | Arnica whitneyi Fern. | Arnica cordifolia | Asteraceae
|
| ARNIC | Arnica L. | arnica | Asteraceae
|
| ARAT | Arnoglossum atriplicifolium (L.) H.E. Robins. | pale Indian plaintain | Asteraceae
|
| ARDI9 | Arnoglossum diversifolium (Torr. & Gray) H.E. Robins. | variableleaf Indian plaintain | Asteraceae
|
| ARFL2 | Arnoglossum floridanum (Gray) H.E. Robins. | Florida cacalia | Asteraceae
|