Plant: tree to 30 m tall, the trunks often several; bark of older trunks grayish-brown; winter buds rounded apically, the scales 2 Leaves: blades ovate or oblong-ovate to lanceolate, 3-9(-12) cm long, 1.5-6(-7) cm wide, the bases acutish to short-cuneate; margins doubly serrate with major teeth sharp, acuminate, these sometimes scarcely distinguishable among minor teeth Inflorescence: catkins in clusters of 2-7, with 1 or more clusters on a branchlet; basal fruiting catkins on peduncles (0-)5-10 mm long; individual fruiting catkins spheroid to nearly cylindric, 1-2.5 cm long, 0.7-1.5 cm wide Flowers: STAMINATE FLOWERS each with (1-)2(-4) stamens; PISTILLATE FLOWERS usually 2 per scale Fruit: samaras, elliptic to obovate, the wings narrower than the body, irregular in shape Misc: In mountain canyons along streams and on moist slopes; 650-1950 m (2100-7500 ft); early spring REFERENCES: Brasher, Jeffrey W. 2001. Betulaceae. J. Ariz. – Nev. Acad. Sci. Volume 33(1)