BETULA NANA L. AND BETULA GLANDULOSA MICHX.
作者： W. J. de Groot , P. A. Thomas , Ross W. Wein
DOI: 10.2307/2960655
关键词:
摘要: Betula nana. A prostrate shrub up to 1 m in height. Twigs stiff, dull dark brown, pubescent, not warty. Young twigs are covered with resin spots. Leaves orbicular or obovate-orbicular, deeply and regularly crenate all around, rounded at both ends glabrous (or a few glands) maturity. green above paler beneath petiole 3 mm. Subspecies exilis (Suk.) Hult. has shorter leaf blades (0.5-1 cm long) than ssp. nana (0.5-2.0 cm). Bracts lack resiniferous hump on the back, possess cuneate base three parallel (almost equal) narrow lobes apex. Male inflorescence is about 0.8 long; erect when young protected by bud scales. Female 0. 5-1.0 fruit; scales more less equal Nutlet wings very narrow: quarter as broad body (although recorded half Alaska-Hulten 1968).
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