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 |
|---|---|---|---|
| Riella affinis | M.Howe & Underw. | 3 | documented |
| Riella alatospora | Wigglesw. | 0 | below the evidence gate |
| Riella americana | M.Howe & Underw. | 0 | below the evidence gate |
| Riella battandieri | Trab. | 0 | below the evidence gate |
| Riella bialata | Trab. | 0 | below the evidence gate |
| Riella capensis | Cavers | 0 | below the evidence gate |
| Riella choconensis | Hässel | 0 | below the evidence gate |
| Riella cossoniana | Trab. | 0 | below the evidence gate |
| Riella cyrenaica | Maire | 0 | below the evidence gate |
| Riella echinata | (Müll.Frib.) Segarra, Puche & Sabovlj. | 0 | below the evidence gate |
| Riella echinospora | Wigglesw. | 0 | below the evidence gate |
| Riella gallica | Balansa ex Trab. | 0 | below the evidence gate |
| Riella gamundiae | Hässel | 0 | below the evidence gate |
| Riella halophila | Banwell | 0 | below the evidence gate |
| Riella helicophylla | (Bory & Mont.) Mont. | 0 | below the evidence gate |
| Riella heliospora | Segarra, Puche & Sabovlj. | 0 | below the evidence gate |
| Riella indica | Steph. ex Kashyap | 0 | below the evidence gate |
| Riella macrocarpa | (P.Allorge) Puche, Segarra, Sabovlj., M.Infante & Heras | 0 | below the evidence gate |
| Riella mediterranea | Segarra, Puche, Sabovlj., M.Infante & Heras | 0 | below the evidence gate |
| Riella notarisii | (Mont.) Mont. | 0 | below the evidence gate |
| Riella numidica | Trab. | 0 | below the evidence gate |
| Riella pampae | Hässel | 0 | below the evidence gate |
| Riella parisii | Gottsche | 0 | below the evidence gate |
| Riella purpureospora | Wigglesw. | 0 | below the evidence gate |
| Riella reuteri | Mont. | 0 | below the evidence gate |
| Riella sersuensis | Trab. | 0 | below the evidence gate |
| Riella spiculata | J.Taylor | 0 | below the evidence gate |
| Riella trigonospora | Segarra & Puche | 0 | below the evidence gate |
| Riella undulata | Hässel | 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.