Douglas' Selaginella: Selaginella douglasii - Uncommon east of the Cascade Mountains in Oregon and Washington though it is fairly abundant in the montane forests of north-central Idaho.
Cliff Spikemoss, Rocky Mountain Spikemoss: Selaginella scopulorum (Synonyms: Selaginella densa, Selaginella densa var. scopulorum, Selaginella engelmannii var. scopulorum)
Wallace's Selaginella, Wallace's Spikemoss: Selaginella wallacei
Alpine Spikemoss, Watson's Selaginella: Selaginella watsonii