A List of the Ferns of Idaho

Spinulose Wood Ferns, Dryopteris, in Western North America

“…Hultén (1941) A specimen from Headquarters, Clearwater County, Idaho is of interest because it was collected and identified by E. T. Wherry 7-14-40 (IDS) as Dryopteris spinulosa. It was annotated as Dryopteris cristata by R. J. Davis, 7-12-43, and is the only collection of Dryopteris cristata for Idaho cited by Flowers (1950). It exactly matches one of my specimens, Britton 65 (OAC) of the hybrid (Dryopteris cristata < spinulosa) from Ontario.…”

“…In 1969, the author collected in Idaho and Montana with the purpose of studying cytologically and comparing morphologically these western diploid plants with plants from the most westerly stations of the eastern diploid. Idaho and Montana were chosen because of the large number of species of Dryopteris reported from the former by Flowers (1950) and suggestions that Dryopteris intermedia was present in Montana (Davis 1952, Frye 1934). Also, it was hoped that hybrids might be found in the West for cytological studies, and that the distribution of Dryopteris spinulosa and Dryopteris intermedia might be clarified.…”

“…Reports of Dryopteris intermedia in Idaho are more prevalent. Flowers (1950) cites two specimens. The second is from Lowell [Shattuck and Fenn, June 25, 1910 (ID) |.…”