| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Selaginella arenicola ssp. arenicola | 17068 | Underwood | sand spikemoss | ITIS | accepted | | Subspecies |
| Selaginella arenicola ssp. riddellii | 17070 | (Van Eselt.) R. Tryon | Riddell's spikemoss | ITIS | accepted | | Subspecies |
| Selaginella arenicola var. riddellii | 540538 | (Van Eselt.) Waterfall | | ITIS | not accepted | synonym of Selaginella arenicola ssp. riddellii | Variety |
| Selaginella riddellii | 521272 | Van Eselt. | | ITIS | not accepted | synonym of Selaginella arenicola ssp. riddellii | Species |
