| Apiaceae | |
Osmorhiza ambigua
| (A. Gray) J.M. Coult. & Rose | Rev. N. Amer. Umbell. 119 | 1888 |
| Apiaceae | |
Osmorhiza amurensis
| F. Schmidt ex Maxim. | Prim. Fl. Amur. 129–130 | 1859 |
| Apiaceae | |
Osmorhiza aristata
| (Thunb.) Rydb. | Bot. Surv. Nebraska 3: 37 | 1894 |
| Apiaceae | |
Osmorhiza aristata
| Makino & Jabe | | |
| Apiaceae | ** |
Osmorhiza berterii
| DC. | Prodr. 4: 232 | 1830 |
| Apiaceae | |
Osmorhiza berteroi
| DC. | Prodr. 4: 232 | 1830 |
| Apiaceae | |
Osmorhiza bipatriata
| Constance & R.H. Shan | Univ. Calif. Publ. Bot. 23(3): 121, f. 2 [map], pl. 27, f. 2 | 1948 |
| Apiaceae | |
Osmorhiza bolanderi
| (A. Gray) Jeps. | Madroño 1(7): 120 | 1923 |
| Apiaceae | |
Osmorhiza brachypoda
| Torr. | Pl. Pratten. Calif. 89 | 1855 |
| Apiaceae | |
Osmorhiza brevipes
| (J.M. Coult. & Rose) Suksd. | Allg. Bot. Z. Syst. 12(1): 5 | 1906 |
| Apiaceae | |
Osmorhiza brevistylis
| DC. | Prodr. 4: 232 | 1830 |
| Apiaceae | |
Osmorhiza brevistylis
| Wedd. | | |
| Apiaceae | |
Osmorhiza chilensis
| Hook. & Arn. | Bot. Beechey Voy. 26–27 | 1841 [1830] |
| Apiaceae | ! |
Osmorhiza claytonii
| (Michx.) C.B. Clarke | Fl. Brit. India 2(6): 690 | 1879 |
| Apiaceae | |
Osmorhiza cordata
| Raf. | Med. Fl. 2: 249 | 1830 |
| Apiaceae | |
Osmorhiza depauperata
| Phil. | Anales Univ. Chile 85: 726 | 1894 |
| Apiaceae | ** |
Osmorhiza divaricata
| (Britton) Suksd. | Allg. Bot. Z. Syst. 12(1): 5 | 1906 |
| Apiaceae | ** |
Osmorhiza divaricata
| Nutt. ex Torr. & A. Gray | Fl. N. Amer. 1: 639 | 1840 |
| Apiaceae | |
Osmorhiza divaricata
| (Britton) Piper | Fl. Palouse Reg. 130 | 1901 |
| Apiaceae | |
Osmorhiza dulcis
| Raf. | Med. Fl. 2: 249 | 1830 |
| Apiaceae | |
Osmorhiza geohintonii
| B.L. Turner | Phytoneuron 2011–4: 1–2, f. 1–2 | 2011 |
| Apiaceae | |
Osmorhiza glabrata
| Phil. | Linnaea 28: 653 | 1856 |
| Apiaceae | |
Osmorhiza intermedia
| (Rydb.) Blank. | Sci. Stud. Montana Coll. Agric., Bot. 1(2): 93 | 1905 |
| Apiaceae | ** |
Osmorhiza intermedia
| (Rydb.) Rydb. | Bull. Torrey Bot. Club 40(2): 66 | 1913 |
| Apiaceae | |
Osmorhiza japonica
| Siebold & Zucc. | Abh. Math.-Phys. Cl. Königl. Bayer. Akad. Wiss. 4(2): 203 | 1845 |
| Apiaceae | |
Osmorhiza laxa
| Royle | Ill. Bot. Himal. Mts. 233, pl. 52, f. 1 | 1835 |
| Apiaceae | |
Osmorhiza leibergii
| (J.M. Coult. & Rose) Blank. | Sci. Stud. Montana Coll. Agric., Bot. 1(2): 93 | 1905 |
| Apiaceae | ** |
Osmorhiza leibergii
| (J.M. Coult. & Rose) Suksd. | Allg. Bot. Z. Syst. 12(1): 5 | 1906 |
| Apiaceae | |
Osmorhiza longistylis
| (Torr.) DC. | Prodr. 4: 232 | 1830 |
| Apiaceae | |
Osmorhiza mexicana
| Griseb. | Abh. Königl. Ges. Wiss. Göttingen 24: 147 | 1879 |
| Apiaceae | |
Osmorhiza montana
| Makino | J. Jap. Bot. 5(7): 28 | 1928 |
| Apiaceae | |
Osmorhiza nuda
| Torr. | Pacif. Railr. Rep. 4(5): 93 | 1857 |
| Apiaceae | |
Osmorhiza obtusa
| (J.M. Coult. & Rose) Fernald | Rhodora 4(43): 154 | 1902 |
| Apiaceae | |
Osmorhiza occidentalis
| (Nutt. ex Torr. & A. Gray) Torr. | Rep. U.S. Mex. Bound. 2(1): 71 | 1859 |
| Apiaceae | |
Osmorhiza purpurea
| Suksd. | Allg. Bot. Z. Syst. 12(1): 5 | 1906 |
| Apiaceae | |
Osmorhiza villicaulis
| (Fernald) Rydb. | Brittonia 1(2): 93 | 1931 |
| Apiaceae | |
Osmorhiza villosa
| Raf. | Med. Fl. 2: 249 | 1830 |