. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. American Aspen 179 ways and about as long as the blades. At flowering time in March or April the catkins are 5 to 8 cm. long, and not very dense; the pistillate flowers are short- stalked, the disk small, the usually 3 stigmas much dilated. In ripening, the pis- tillate catkins become 12 cm. long or more, the papillose capsules i to cm. long, and longer than their stalks. is much planted for shade and ornamen
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. American Aspen 179 ways and about as long as the blades. At flowering time in March or April the catkins are 5 to 8 cm. long, and not very dense; the pistillate flowers are short- stalked, the disk small, the usually 3 stigmas much dilated. In ripening, the pis- tillate catkins become 12 cm. long or more, the papillose capsules i to cm. long, and longer than their stalks. is much planted for shade and ornament; its wood much resembles that of its eastern relative, but is lighter, its specific gravity being about 16. LARGE-TOOTHED ASPEN —Populus grandidentata Michaux A forest tree, attaining a maximum height of about 25 meters, with a trunk sometimes 6 to 7 meters thick. It prefers rich soil, and ranges from Nova Scotia to Delaware, in and along the mountams south to North Carolina, westward to Ontario, Minnesota, lUinois, and Tennessee. The bark is thin, smooth, and light greenish brown, except at and near the bases of old trunks where it is much thicker, fissured and dark brown. The stout young twigs are quite velvety, becoming smooth, reddish brown, and shining. The buds are finely hairy, 5 or 6 mm. long, and pointed. The leaves are ovate, 6 to 12 cm. long, or those of young trees very much larger (sometimes 3 dm. long); when young they are densely white-velvety on the under side, becoming smooth or nearly so when old, or those of young shoots persistently velvety beneath; they are pointed at the apex, and rounded or narrowed at the base, rarely somewhat heart-shaped, coarsely and irregularly toothed, or those of young shoots finely toothed; the upper surface is dark green and dull; the leaf-stalks are laterally flattened, to 7 cm. long, the stipules linear, 2 cm. long or less. The catkins appear in March or April, and are 10 cm. long or less at flowering time, the pi
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