| Lycopodiaceae | |
Lycopodium obscurum fo. dendroideum
| (Michx.) H.L. Blomq. & Correll | J. Elisha Mitchell Sci. Soc. 56(1): 101 | 1940 |
| Lycopodiaceae | |
Lycopodium obscurum var. dendroideum
| (Michx.) D.C. Eaton | Manual (ed. 6) 696 | 1890 |
| Lycopodiaceae | |
Lycopodium obscurum fo. exsertum
| Vict. | Contr. Lab. Bot. Univ. Montréal 3: 32 | 1925 |
| Lycopodiaceae | |
Lycopodium obscurum fo. exsertumfurcatum
| Vict. | Contr. Lab. Bot. Univ. Montréal 3: 33 | 1925 |
| Lycopodiaceae | |
Lycopodium obscurum var. isophyllum
| Hickey | Amer. Fern J. 67: 47 | 1977 |
| Lycopodiaceae | |
Lycopodium obscurum var. japonicum
| Thunb. | Fl. Jap. 341 | 1784 |
| Lycopodiaceae | |
Lycopodium obscurum fo. monostachyon
| Vict. | Contr. Lab. Bot. Univ. Montréal 3: 33 | 1925 |
| Lycopodiaceae | |
Lycopodium obscurum fo. obscurum
| | | |
| Lycopodiaceae | |
Lycopodium obscurum var. obscurum
| | | |
| Lycopodiaceae | |
Lycopodium obscurum fo. proliferum
| Vict. | Contr. Lab. Bot. Univ. Montréal 3: 32 | 1925 |
| Lycopodiaceae | |
Lycopodium obscurum fo. strictum
| (Milde) Nakai ex H. Hara | Bot. Mag. (Tokyo) 48(574): 706 | 1934 |