| Papaveraceae | |
Capnorchis americana
| Boerh. ex Borckh | | |
| Papaveraceae | |
Capnorchis canadensis
| (Goldie) Kuntze | Revis. Gen. Pl. 1: 14 | 1891 |
| Papaveraceae | |
Capnorchis chrysantha
| (Hook. & Arn.) Planch. | Fl. Serres Jard. Eur. 8: 193, t. 820 | 1852-1853 [1853] |
| Papaveraceae | |
Capnorchis cucullaria
| (L.) Planch. | Fl. Serres Jard. Eur. 8: 193 | 1852-1853 [1853] |
| Papaveraceae | |
Capnorchis eximia
| (Ker Gawl.) Kuntze | Revis. Gen. Pl. 1: 15 | 1891 |
| Papaveraceae | |
Capnorchis formosa
| Planch. | Fl. Serres Jard. Eur. viii: 193 | 1852-1853 |
| Papaveraceae | |
Capnorchis occidentalis
| (Rydb.) House | Amer. Midl. Naturalist 8: 62 | 1922 |
| Papaveraceae | |
Capnorchis ochroleuca
| (Engelm.) Greene | Fl. Francisc. 2: 279 | 1891 |
| Papaveraceae | |
Capnorchis pauciflora
| (S. Watson) Greene | Fl. Francisc. 279 | 1891 |
| Papaveraceae | |
Capnorchis uniflora
| (Kellogg) Kuntze | Revis. Gen. Pl. 1: 15 | 1891 |