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 |
|---|---|---|---|
| Frailea chiquitana | Cárdenas | 5 | documented |
| Frailea cataphracta | (Dams) Britton & Rose | 2 | below the evidence gate |
| Frailea gracillima | (Lem.) Britton & Rose | 2 | below the evidence gate |
| Frailea pygmaea | (Speg.) Britton & Rose | 1 | below the evidence gate |
| Frailea schilinzkyana | (F.Haage) Britton & Rose | 1 | below the evidence gate |
| Frailea alexandri | Metzing | 0 | below the evidence gate |
| Frailea amerhauseri | Prestlé | 0 | below the evidence gate |
| Frailea buenekeri | W.R.Abraham | 0 | below the evidence gate |
| Frailea castanea | Backeb. | 0 | below the evidence gate |
| Frailea curvispina | Buining & Brederoo | 0 | below the evidence gate |
| Frailea diersiana | Schädlich | 0 | below the evidence gate |
| Frailea erythracantha | R.Pontes, A.S.Oliveira & Deble | 0 | below the evidence gate |
| Frailea fulviseta | Buining & Brederoo | 0 | below the evidence gate |
| Frailea larae | R.Vásquez | 0 | below the evidence gate |
| Frailea mammifera | Buining & Brederoo | 0 | below the evidence gate |
| Frailea phaeodisca | (Speg.) Backeb. & F.M.Knuth | 0 | below the evidence gate |
| Frailea pumila | (Lem.) Britton & Rose | 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.