Flora of North America species comparison

when young dark reddish brown, in maturity light reddish brown to tan or brownish or grayish white, smooth, rather close or readily exfoliating in paper-thin sheets;

lenticels pale, horizontal, in maturity dark, horizontally expanded.

without taste and odor of wintergreen, moderately to densely pubescent, not conspicuously resin-coated, without large, warty, resinous glands.

without taste and odor of wintergreen, usually covered with short bristly hairs.

blade obovate–reniform, with 2–3 pairs of lateral veins, 0.5–1 × 0.5–1.2 cm, base cuneate, margins deeply crenate-dentate, apex broadly rounded to nearly truncate;

surfaces abaxially usually glabrous.

blade ovate or rhombic-ovate, margins serrate, apex acute;

surfaces abaxially sparsely pubescent to velutinous, especially along major veins and in vein axils, without prominent resinous glands.

erect, short-cylindric, 0.5–1 × 0.5–0.8 cm, shattering with fruits in fall;

scales unlobed (lateral lobes sometimes present but greatly reduced), glabrous.

with wings not apparent or reduced to narrow ridges.

with wings equal to or somewhat broader than body, broadest near summit, extended beyond body apically.

catkins pendulous or subpendulous, cylindric, shattering with fruits in late fall;

scales puberulent to glabrous, often ciliate, lobes diverging at middle.