Botrychium multifidum subsp. robtstum (Rupr.) Clausen
FamilyOphioglossaceae — APG family: Ophioglossaceae
SynonymsBotrychium multifidum var. robustum (Rupr.) Christens., Botrychium silaifolium Presl., Botrychium rutaceum var. robustum Rupr.
Common nameleathery grape fern
DescriptionRhizome fairly long and thick, creeping, with several thick roots; up to 30 cm high, with 1 new green and 1 old overwintering basal, petiolated, thick, leathery, sterile blade, somewhat pubescent when young; fertile blade long-petioled, bi- pinnate.
EcologySandy meadows and woods. Described from Kamchatka.
Alaskan specimens, apparently very rare, belong to subsp. robustum, and are marked by somewhat more acute divisions and more hairy sterile blades than typical B. multifidum. Broken line on circumpolar map indicates range of other subspecies.
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.