214 SALICACE^. PopuLus. 



1. PopuLUs TREMVhoiDEs, Michx. American Aspeu. 



Leaves cordate-orbicular, with a short abrupt acumination, serrulate-dentate, pubescent 



on the margin, green and smooth on both sides ; bracts of the ament mostly 3-parted, silky 



at the tip ; stigmas 2, sessile, — Michx.fl. 2. p. 243 ; Michx.f sylv. 2. t. 99./. 1 ; Bigel.fl. 



Bost. p. 369 ; Torr. compend. p. 375 ; Beck, hot. p. 323 ; Darlingt. fl. Cest. p. 568 ; Hook. 



fl.Bor.-Am. 2. p. 154.  



A tree 20 - 50 feet high and 6-12 inches in diameter ; the bark (except on large trunks) 

 smooth and whitish. Leaves about 2 inches long, the breadth usually rather greater than the 

 length, smooth on both sides when mature, the margin slightly ciliate, rarely with two glands 

 at the base : petiole about as long as the leaf, very slender, laterally compressed so as to be 

 almost ancipital. Aments 2-3 inches long, pendulous, villous when young ; the scales brown, 

 cuneate-oblong, divided below the middle into three parallel lobes, and often a small lateral 

 lobe on each side. Stamens about 12. Stigmas with 2 divaricate linear lobes. Capsule 

 oblong-ovoid, about 2 lines long, distinctly pedicellate. 



Woods and hill-sides, both in moist and dry situations ; common. FL March - April. 

 Fr. May. 



Pursh, Hooker, Darlington and London consider P. trepida of Willdenow as identical with 

 this species, while Muhlenberg regards it the same as P. grandidentata. We have adopted 

 the latter view. 



2. PoPULUs GRANDIDENTATA, Michx. (Plate CXXT.) Large Aspen. 



Leaves roundish-ovate, acute, coarsely sinuate-toothed, smooth on both sides when mature 

 (white and woolly when young) ; ovary ovoid-lanceolate ; lobes of the stigma linear. — Michx. 

 fl. 2. p. 243 ; Michx. f. sylv. 2. t. 99. /. 2 ; Pursh, fl. 2. p. 619 ; Bigel. fl. Bost. p. 369 ; 

 Ell. sk. 2. p. 710; Torr. compend. p. 175 ; Beck, hot. p. 323 ; Darlingt. fl. Cest. p. 569 ; 

 Hook. fl. Bor.-Am. 2. p. 154 ; P. trepida, Willd. sp. 4. p. 803. 



A tree 30 - 50 feet high, sparingly branched, with a trunk 8-18 inches in diameter, and 

 smoothish gray bark. Twigs terete. Leaves 3-5 inches in diameter, when young clothed 

 with a dense whitish woolly pubescence, obtuse or truncate at the base, sometimes with 2 

 small glands near the insertion of the petiole, the margin furnished with large unequal teeth : 

 petioles about 2 inches long, compressed towards the lamina (as is usual in this genus). 

 Stipules lanceolate, caducous. Flowers appearing long before the leaves. Aments 3-4 

 inches long, villous. Rachis, pedicels and torus hairy. Bracts cuneate-fanshaped ; the 

 summit laciniately 5-cleft, and fringed with silky hairs. Fertile ament shorter than the 

 sterile. Stamens mostly 12. Capsules on short pedicels. 



Moist woods ; common in many parts of the Stale, particularly in the southern counties 

 and along the Hudson river. Fl. April. Fr. May. 



