Alnus crispa subsp. sinuata (Regel) Hult.
FamilyBetulaceae — APG family: Betulaceae
SynonymsAlnus viridis var. sinuata Regel, Alnus sinuata (Regel) Rydb.
Common namesitka alder
DescriptionSimilar to subsp. crispa, but leaves larger and broader, more or less lobed.
EcologyOccurs in a more distinct subalpine region along the coast.
The branches are bowlike and pressed along the slopes by the snow, forming almost impenetrable thickets on the mountainsides, especially in the coastal zone. Described from Kam- chatka, and the coast of Alaska and Canada. An extreme variation with laciniated, sharply serrulated or double-serrulated leaves is var. laciniata Hult. Subsp. sinuata introgrades with subsp. crispa; the ap- proximate northern boundary for its influence is marked by a line on the Alaskan map.
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.