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Family: Betulaceae

Group: Vascular Plant, Species

Scientific NameCommon NameSummary
Alnus incanaThinleaf AlderOnly two (georeferenced) collections in ARCTOS from Southeast Alaska, one from Juneau, another from Haines. FNA distribution maps has this species occurring only east of the coast range in the vicinity of Southeast Alaska.
Alnus rubraRed AlderDeciduous tree common in riparian areas and disturbed areas at low elevations. Scattered collections in ARCTOS, mostly from the mainland and inner islands, but also Baranof, Chichagof and Coronation Islands.No collections from Prince of Wales and associated outer islands, nor the northern gulf coast. Presumably it occurs throughout most of the region, though northern Southeast Alaska is considered the northern limit of its range.
Alnus viridisSitka AlderCommon deciduous tree-like shrub frequently found along shorelines and colonizing avalanche chutes or mud slide areas. Also found at treeline.

Collections from throughout much of the region, with a few gaps (none from Admiralty Island, for example). FNA suggests ssp crispa does not occur in the region, but rather the very similar ssp fruticosa occurs in the northern part of the region (approx. Juneau/Glacier Bay north).

From FNA account for ssp fruticosa: "This primarily subarctic Asian subspecies has long been mistaken in western North America for Alnus viridis subsp. crispa, which it closely resembles, or for subsp. sinuata (J. J. Furlow 1983b). It can be separated from the former by its larger and more coarsely toothed leaves, and from the latter by its much thicker, mostly single-toothed leaf blades."
Betula glandulosaResin birchFNA map implies range of this species overlaps with Southeast Alaska along the east side of Lynn Canal. Three georeferenced collections of this species from Southeast Alaska in ARCTOS are two from near Haines and one on Chichagof Island.

From FNA: "Plants intermediate between Betula glandulosa and B . nana subsp. exilis make up a continuum of forms linking the typical forms of Betula nana and B . glandulosa in parts of Alaska where the ranges of these species overlap. "
Betula nanaDwarf birchFNA map indicates this species range includes the northern mainland of Southeast Alaska. It appears there may not be any (wild) collections that have been determined as this species from Southeast Alaska. ARCTOS includes B. glandulosa in the search results for B. nana.
Betula neoalaskanaAlaska Paper BirchNot collected from the region, the range given in FNA approaches most closely along the southern border of Yukon Territory. If this species does occur, it is likely only at the margins.
Betula papyriferaWestern Paper BirchCollections in ARCTOS from Hyder, Juneau, and upper Lynn Canal.