Entry for Polystichum scopulinum (D. C. Eaton) Maxon [family DRYOPTERIDACEAE]
Entry From
Flora of North America, Vol 2,
Names
Polystichum scopulinum (D. C. Eaton) Maxon [family DRYOPTERIDACEAE], Fern Bull., 8: 29. 1900
Aspidium aculeatum (Linnaeus) Swartz var. scopulinum D. C. Eaton [family DRYOPTERIDACEAE], Ferns N. Amer., 2: 125. 1880
Polystichum mohrioides (Bory) C. Presl var. scopulinum (D. C. Eaton) Fernald [family DRYOPTERIDACEAE]
Discussion
Polystichum scopulinum is widely distributed in the United States west of the 110th meridian, where it occurs in sporadic, usually small populations. The species is abundant only on montane serpentine outcrops. The populations in Newfoundland and Quebec are dramatically disjunct.
Polystichum scopulinum is an allopolyploid, believed on morphologic grounds to be derived from P . imbricans × lemmonii (D. H. Wagner 1979). Based on putative hybridization between P . scopulinum and P . munitum (P. S. Soltis et al. 1989; W. H. Wagner Jr. 1973), however, P . munitum may also be involved. This hybrid is discussed under P . californicum .