| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Selaginella densa var. densa | 530293 | Rydb. | lesser spikemoss dense spike-moss dense spikemoss | ITIS | accepted | | Variety |
| Selaginella densa var. scopulorum | 530294 | (Maxon) R. Tryon | Rocky Mountain spikemoss Rocky Mountain clubmoss | ITIS | accepted | | Variety |
| Selaginella densa var. standleyi | 530295 | (Maxon) R. Tryon | Standley's spikemoss | ITIS | accepted | | Variety |
| Selaginella engelmannii | 521268 | Hieron. | | ITIS | not accepted | synonym of Selaginella densa var. densa | Species |
| Selaginella engelmannii var. scopulorum | 540539 | (Maxon) C.F. Reed | | ITIS | not accepted | synonym of Selaginella densa var. scopulorum | Variety |
| Selaginella engelmannii var. standleyi | 540540 | (Maxon) C.F. Reed | | ITIS | not accepted | synonym of Selaginella densa var. standleyi | Variety |
| Selaginella scopulorum | 521273 | Maxon | | ITIS | not accepted | synonym of Selaginella densa var. scopulorum | Species |
| Selaginella standleyi | 521276 | Maxon | | ITIS | not accepted | synonym of Selaginella densa var. standleyi | Species |
