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Populus heterophylla, Linn. Swamp or Black Cottonwood. Downy Poplar. A swamp species of irregular branching habit, only rarely planted, reaching 80 ft. and diam. of trunk of 3 ft.: lvs. densely tomentose when young, but becoming glabrous with age or remaining floccose beneath, 4-7 in. long, broad-ovate in outline, obtuse or somewhat acute at apex, more or less truncate or subcordate or rounded at base, serrate, the petiole terete and tomentose or nearly glabrous: stami- nate catkins stout but rather short, stamens 12-20 and scales filiform-lobed; pistillate catkins slender but rather short, becoming erect or spreading: caps, ovoid acute, on slender pedicels. Conn, to Ga., La., Ark. and S. Mo.; near the coast in the northern states.

Populus heterophylla, Linn. Swamp or Black Cottonwood. Downy Poplar. A swamp species of irregular branching habit, only rarely planted, reaching 80 ft. and diam. of trunk of 3 ft.: lvs. densely tomentose when young, but becoming glabrous with age or remaining floccose beneath, 4-7 in. long, broad-ovate in outline, obtuse or somewhat acute at apex, more or less truncate or subcordate or rounded at base, serrate, the petiole terete and tomentose or nearly glabrous: stami- nate catkins stout but rather short, stamens 12-20 and scales filiform-lobed; pistillate catkins slender but rather short, becoming erect or spreading: caps, ovoid acute, on slender pedicels. Conn, to Ga., La., Ark. and S. Mo.; near the coast in the northern states. S.S.9:489.

V. Balsam Poplars. Tacamahac. Lvs. not lobed, varying from broad-ovate to narrower; mature lvs. whitish but not cottony-tomentose beneath, not clearly translucent-edged; petioles cylindrical or 4-angled, mostly grooved on upper side: terminal buds large to very large, very viscid and balsamic in odor: mostly large trees.

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