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By Leslie A. Little, Elbert L. Viereck

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Extra resources for Alaska trees and shrubs

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Wide, curled downward slightly on edges; fruit stalk bent or curved throughout its length _________ _________ 94. Labrador-tea (Ledum groenlandicum) cc. Leaves linear, 5/16-5/8 in. ) long, 1/64-1/8 in. ) wide, tightly rolled under, curled edges covering lower surface; fruit stalk abruptly bent near capsule __________________________________ __ 93. narrowleaf Labrador-tea (Ledum decumbens) Page 37 bb. Leaves hairless or nearly so beneath. d. Leaves flat or only slightly rolled under, with scurfy scales often appearing as white dots; young twigs with fine short white hairs ______________________________ _________ 108.

Paper birch (Betula papyrifera). c. Leaves long-pointed, usually wedge-shaped at base; bark usually white in age; interior Alaska __________________________________ 50b. Alaska paper birch (Betula papyrifera var. humilis) cc. Leaves mostly short-pointed. d. Leaves thin, mostly rounded at base; bark usually reddish brown; northern part of southeast Alaska __________________ 50a. western paper birch (Betula papyrifera var. commutata) dd. Leaves thick, wedge-shaped or rounded at base, with white hairs on toothed edges; bark usually dark brown or gray; southern and southern interior Alaska _____________________________ 50c.

Crowberry (Empetrum nigrum) II. Leaves alternate, linear-lanceolate, 1/16-3/16 in. ) long, pointed, without groove on lower surface, often with long hairs on margin; dried capsule often persistent at tip of twig ________ ____ 105. starry cassiope (Cassiope stelleriana) Page 35 HH. Leaves paired or opposite, scalelike, pressed against twig. J. Leaves deeply grooved on lower surface, 1/8-3/16 in. ) long _______________________________ __ 103. four-angled cassiope (Cassiope tetragona) JJ. Leaves not deeply grooved on lower surface, 1/16-5/32 in.

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