Betula papyrifera var. cordifolia

More strictly erect and more branching below; lvs ovate to broadly ovate, short-acuminate, doubly serrate, cordate or subcordate (seldom merely truncate) at base, ±pubescent beneath; fruiting catkins longer, avg 5 cm; pistillate scales 5.6-8.7 נ4-5.4 mm, the lateral lobes ascending, scarcely dilated, the middle lobe somewhat prolonged and oblong; frs 4.1-6.7 mm wide, the body 1.2-2 mm wide; 2n=48 (42, 56). Nf. and e. Que. to n. N.Y.; high Blue Ridge of N.C.; n. Minn. (B. cordifolia)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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