56 WILLOW FAMILY 



Populus grandidentata M i c h a u x 1803 Toothed Aspen 



Tree of medium size, 30-50 ft. high, 1-2 ft. diam.; bark smooth, 

 green-gray or yellowish; leaves ovate or round in outline with 6-12 large 

 usually blunt teeth on each side, tip also rather blunt, base tapering, 

 truncate or somewhat rounded, densely white woolly when young, the 

 wool persisting for a long time on the lower surface, but both surfaces 

 finally smooth, more or less three-nerved at base, the lateral veins 6-12. 

 6-15 cm. long, 4-12 cm. wide, petioles flattened, long, 5-8 cm., densely 

 white woolly, then smooth; bracts 5-6-cleft and silky, stamens 6-12 in 

 each flower, the catkins 4-10 cm. long, pistillate catkins 6-15 cm., the 

 capsules 2-valved, finely warted, 5-7 mm. long; flowering in March or 

 April, the seeds flying in May : grandidentata, large-toothed, re- 

 ferring to the leaf margin. 



Throughout the state, except the southwest; NS-NC-Tenn-Minn. 



Wood brownish, soft, weak, close-grained, weight 29 lbs. ; used for 

 excelsior, paper, woodenware, and in turnery. 



Populus tremuloides M ichaux Aspen, Quaking Asp 



Variable, but usually a small tree, and often a shrub, 20-50 ft. high. 

 ^-l^ ft. diam.; bark smooth, bright gray-green or yellow-green; leaves 

 broadly ovate to rounded, the margin finely toothed or wavy", and sparsely 

 hairy, abruptly tipped, the tip sharp, x / 2 cm. long, base truncate or 

 rounded, smooth above and below, lateral veins 6-12, petioles strongly 

 flattened, slender, 3-5 cm. long; bracts deeply 3-5-cleft and long-hairy, 

 stamens 6-12 in each flower, the catkins 3-6 cm. long; pistillate catkins 

 5-7 cm. long, the capsules two-valved, 6 mm.; flowering in March and 

 April, fruit maturing in May and June. 



Common throughout the state, but especially in the north; Lab-Nfd- 

 Ky-Mex-Cal-Ala. 



1'ropagated by root sprouts and cuttings, readily grown from seed. 



Wood brownish, soft, weak, weight 20 lbs.; used for excelsior, paper 

 boxes, flooring and turnery. The young inner bark is used for food 

 by the northern Indian. 



Populus deltoides Marshall 1785 Cottonwood 



Large tree 80-120 ft. high, 2-6 ft. diam.; bark smooth and gray green 

 for a number of years, deeply ridged when old; leaves broadly ovate or 

 rounded, edge coarsely wavy-toothed, tip long-pointed, base truncate or 

 shallowly cordate, smooth and shining, 5-10 cm. long and wide, petioles 



