Every accepted species in the genus is listed. A name links to its page when we hold at least three commercially licensed photographs of it. Where we do not, the row shows how many we actually found, which is usually none.
| Species | Authority | Usable photographs | Page |
|---|---|---|---|
| Arnica cordifolia | Hook. | 486 | documented |
| Arnica montana | L. | 355 | documented |
| Arnica latifolia | Bong. | 168 | documented |
| Arnica discoidea | Benth. | 165 | documented |
| Arnica acaulis | (Walter) Britton, Sterns & Poggenb. | 105 | documented |
| Arnica angustifolia | Vahl | 37 | documented |
| Arnica chamissonis | Less. | 36 | documented |
| Arnica longifolia | D.C.Eaton | 29 | documented |
| Arnica parryi | A.Gray | 25 | documented |
| Arnica mollis | Hook. | 24 | documented |
| Arnica fulgens | Pursh | 19 | documented |
| Arnica viscosa | A.Gray | 19 | documented |
| Arnica lessingii | Greene | 17 | documented |
| Arnica griscomii | Fernald | 16 | documented |
| Arnica spathulata | Greene | 15 | documented |
| Arnica lanceolata | Nutt. | 14 | documented |
| Arnica rydbergii | Greene | 13 | documented |
| Arnica cernua | Howell | 12 | documented |
| Arnica lonchophylla | Greene | 12 | documented |
| Arnica unalaschcensis | Less. | 9 | documented |
| Arnica venosa | H.M.Hall | 9 | documented |
| Arnica gracilis | Rydb. | 8 | documented |
| Arnica sororia | Greene | 8 | documented |
| Arnica nevadensis | A.Gray | 1 | below the evidence gate |
| Arnica ovata | Greene | 1 | below the evidence gate |
| Arnica attenuata | (Greene) Maguire | 0 | below the evidence gate |
| Arnica dealbata | (A.Gray) B.G.Baldwin | 0 | below the evidence gate |
| Arnica denudata | Greene | 0 | below the evidence gate |
| Arnica intermedia | Turcz. | 0 | below the evidence gate |
| Arnica louiseana | Farr | 0 | below the evidence gate |
| Arnica mallotopus | Makino | 0 | below the evidence gate |
| Arnica porsildiorum | B.Boivin | 0 | below the evidence gate |
| Arnica sachalinensis | (Regel) A.Gray | 0 | below the evidence gate |
This site is commercial, so it can only publish photographs licensed for commercial use. Roughly three quarters of the photographs on iNaturalist are CC BY-NC, which excludes them. A species needs at least three usable photographs before we will build it a page, because a page with one picture and no traits tells you nothing you could not get from a search result, and generating hundreds of thousands of those is precisely the practice that got the previous version of this site deleted.
So the species above without a link are not errors and they are not omissions. They are real, accepted plants that we cannot yet document to the standard we hold ourselves to, and the count in the photographs column is exactly how far short we fall.