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 |
|---|---|---|---|
| Gymnocalycium monvillei | (Lem.) Pfeiff. ex Britton & Rose | 38 | documented |
| Gymnocalycium pflanzii | (Vaupel) Werderm. | 20 | documented |
| Gymnocalycium gibbosum | (Haw.) Pfeiff. ex Mittler | 11 | documented |
| Gymnocalycium mostii | (Gürke) Britton & Rose | 7 | documented |
| Gymnocalycium quehlianum | (F.Haage ex H.Quehl) Vaupel ex Hosseus | 7 | documented |
| Gymnocalycium striglianum | Jeggle ex H.Till | 7 | documented |
| Gymnocalycium friedrichii | (Werderm.) Pazout | 5 | documented |
| Gymnocalycium spegazzinii | Britton & Rose | 5 | documented |
| Gymnocalycium anisitsii | (K.Schum.) Britton & Rose | 4 | documented |
| Gymnocalycium pugionacanthum | Backeb. ex H.Till | 4 | documented |
| Gymnocalycium saglionis | (Cels) Britton & Rose | 4 | documented |
| Gymnocalycium andreae | (Boed.) Backeb. & F.M.Knuth | 3 | documented |
| Gymnocalycium paediophilum | F.Ritter ex Schütz | 3 | documented |
| Gymnocalycium reductum | (Link) Pfeiff. ex Mittler | 3 | documented |
| Gymnocalycium schroederianum | Osten | 3 | documented |
| Gymnocalycium castellanosii | Backeb. | 2 | below the evidence gate |
| Gymnocalycium robustum | R.Kiesling, O.Ferrari & Metzing | 2 | below the evidence gate |
| Gymnocalycium baldianum | (Speg.) Speg. | 1 | below the evidence gate |
| Gymnocalycium bodenbenderianum | (Hosseus) A.Berger | 1 | below the evidence gate |
| Gymnocalycium erinaceum | J.G.Lamb. | 1 | below the evidence gate |
| Gymnocalycium mendozaense | C.A.L.Bercht & Schädlich | 1 | below the evidence gate |
| Gymnocalycium × heidiae | Neuhuber | 0 | below the evidence gate |
| Gymnocalycium × momo | V.Gapon & Schelkun. | 0 | below the evidence gate |
| Gymnocalycium × pazoutianum | Halda | 0 | below the evidence gate |
| Gymnocalycium alboareolatum | Rausch | 0 | below the evidence gate |
| Gymnocalycium amerhauseri | H.Till | 0 | below the evidence gate |
| Gymnocalycium angelae | Mereg. | 0 | below the evidence gate |
| Gymnocalycium bayrianum | H.Till | 0 | below the evidence gate |
| Gymnocalycium berchtii | Neuhuber | 0 | below the evidence gate |
| Gymnocalycium bruchii | (Speg.) Hosseus | 0 | below the evidence gate |
| Gymnocalycium cabreraense | Schädlich, C.A.L.Bercht & Melojer | 0 | below the evidence gate |
| Gymnocalycium calochlorum | (Boed.) Y.Itô | 0 | below the evidence gate |
| Gymnocalycium capillense | (Schick) Hosseus | 0 | below the evidence gate |
| Gymnocalycium carolinense | (Neuhuber) Neuhuber | 0 | below the evidence gate |
| Gymnocalycium chacoense | Amerh. | 0 | below the evidence gate |
| Gymnocalycium chiquitanum | Cárdenas | 0 | below the evidence gate |
| Gymnocalycium denudatum | (Link & Otto) Pfeiff. ex Mittler | 0 | below the evidence gate |
| Gymnocalycium esperanzae | Řepka & Kulhánek | 0 | below the evidence gate |
| Gymnocalycium eurypleurum | Plesnik ex F.Ritter | 0 | below the evidence gate |
| Gymnocalycium fischeri | Halda, Kupčák, Lukašik & Sladk. | 0 | below the evidence gate |
| Gymnocalycium glaucum | F.Ritter | 0 | below the evidence gate |
| Gymnocalycium horstii | Buining | 0 | below the evidence gate |
| Gymnocalycium hossei | (Haage) A.Berger | 0 | below the evidence gate |
| Gymnocalycium hybopleurum | (K.Schum.) Backeb. | 0 | below the evidence gate |
| Gymnocalycium hyptiacanthum | (Lem.) Britton & Rose | 0 | below the evidence gate |
| Gymnocalycium kieslingii | O.Ferrari | 0 | below the evidence gate |
| Gymnocalycium kroenleinii | R.Kiesling, Rausch & O.Ferrari | 0 | below the evidence gate |
| Gymnocalycium kuehhasii | Neuhuber & R.Sperling | 0 | below the evidence gate |
| Gymnocalycium kulhanekii | Papsch | 0 | below the evidence gate |
| Gymnocalycium leptanthum | (Speg.) Speg. | 0 | below the evidence gate |
| Gymnocalycium marianae | Perea, O.Ferrari, Las Peñas & R.Kiesling | 0 | below the evidence gate |
| Gymnocalycium marsoneri | Frič ex Y.Itô | 0 | below the evidence gate |
| Gymnocalycium mazanense | (Backeb.) Backeb. | 0 | below the evidence gate |
| Gymnocalycium mesopotamicum | R.Kiesling | 0 | below the evidence gate |
| Gymnocalycium mihanovichii | (Frič & Gürke) Britton & Rose | 0 | below the evidence gate |
| Gymnocalycium neuhuberi | H.Till & W.Till | 0 | below the evidence gate |
| Gymnocalycium nigriareolatum | Backeb. | 0 | below the evidence gate |
| Gymnocalycium ochoterenae | Backeb. | 0 | below the evidence gate |
| Gymnocalycium oenanthemum | Backeb. | 0 | below the evidence gate |
| Gymnocalycium paraguayense | (K.Schum.) Hosseus | 0 | below the evidence gate |
| Gymnocalycium parvulum | (Speg.) Speg. | 0 | below the evidence gate |
| Gymnocalycium ragonesei | A.Cast. | 0 | below the evidence gate |
| Gymnocalycium rhodantherum | (Boed.) H.Till | 0 | below the evidence gate |
| Gymnocalycium ritterianum | Rausch | 0 | below the evidence gate |
| Gymnocalycium schickendantzii | (F.A.C.Weber) Britton & Rose | 0 | below the evidence gate |
| Gymnocalycium taningaense | Piltz | 0 | below the evidence gate |
| Gymnocalycium uebelmannianum | Rausch | 0 | below the evidence gate |
| Gymnocalycium uruguayense | (Arechav.) 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.