Populus tremuloides Michx.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Tree with light grayish-green smooth bark, becoming dark and furrowed in age; petioles strongly flattened; terminal buds brown, shining, glabrous or nearly so; lvs glabrous, dark green above, light green and slightly glaucous beneath, without basal glands, 3–10 cm, rotund-ovate to reniform-cordate, shortly acuminate to merely apiculate, the lowest lateral veins strongly ascending; lvs of short shoots finely and regularly toothed, with mostly 18–30 teeth to 1 mm deep on each side, those of the long shoots often with even smaller and more numerous teeth, or subentire; scales of the catkins cleft to below the middle into 3–5 lance-triangular lobes; stamens, stigmas, and frs much as in no. 2 [Populus grandidentata Michx.]; 2n=38, 57, 76. Moist upland woods and streamsides, often on cut-over or burned land; Lab. to Alas., s. to N.J., Va., Tenn., Mo., and Mex.
aspen, quaking aspen