Botrychium virginianum subsp. europaeum (Angstr.) Clausen
FamilyOphioglossaceae — APG family: Ophioglossaceae
SynonymsBotrychium virginianum var. europaeum Angstr.
Common namerattlesnake fern
DescriptionFrom 20 to 60 cm tall, sterile blade light green, nearly sessile, borne above the middle of the stem; fertile blade long-stalked, often 2—3-pinnate.
EcologyWoods and meadows, with preference for calcareous soil. Described from “America,” subsp. europaeum from Europe.
Apparently very rare within Alaskan area. Specimens observed belong to northern race, subsp. europaeum, sterile blades, more leathery than those of subsp. virginia- num, are pinnate, not so deeply divided, and ultimate divisions are often crowded or imbricate. Broken line on circumpolar map indicates range of subsp. virginianum.
Hultén's Flora About

This is a digital representation of Eric Hultén’s ‘Flora of Alaska and Neighboring Territories: A Manual of the Vascular Plants’, which was published by Stanford University Press in 1968. The book was digitized by C. Webb (at UAMN) as part of the Flora of Alaska project, with funding by the US NSF (Grant 1759964 to Ickert-Bond & Webb), and with permission of Stanford University Press. Data and images © 1968 Board of Trustees of the Leland Stanford Jr. Univ. Usage licence: Creative Commons BY-NC-SA 4.0. NB: You may find OCR errors; please refer to the hard-copy if in doubt.