. 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. region; it is a shrub or small tree, when first discovered supposed to be the same as the well-known European Alnus incana, but subsequent study has shown it to be quite different from that species; the largest individual tree observed was about 8 meters high, with a trunk dm. thick. The bark is brown, smooth or nearly so, the young twigs slender, densely brownish-hairy, becoming smooth and gray-brown the second seaso
. 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. region; it is a shrub or small tree, when first discovered supposed to be the same as the well-known European Alnus incana, but subsequent study has shown it to be quite different from that species; the largest individual tree observed was about 8 meters high, with a trunk dm. thick. The bark is brown, smooth or nearly so, the young twigs slender, densely brownish-hairy, becoming smooth and gray-brown the second season. The leaves are rather thin in texture, oblong to obovate, acute at both ends or bluntish at the apex, 8 to 12 cm. long, 6 cm. wide or less, sharply irregularly toothed, densely hairy on the prominent veins beneath, otherwise smooth or nearly so, dark green on the upper surface, pale green on the lower; the leaf-stalks are about I cm. long and very hairy. The fruit- ing catkins are numerous, oblong. Fig. York Alder, short-stalked, cm. long, their scales triangular-wedge-shaped, 3 to 4 mm. long, toothed at the summit, the nut oval, half longer than wide, narrowly margined. 8. EUROPEAN ALDER—Alnus rotundifolia Miller Betula Alnus glutinosa Linnseus Alnus glutinosa Gaertner This European tree has escaped from cultivation and become estabhshed in New Jersey, southern New York, eastern Mas- sachusetts, and near Chicago; it reaches, in Europe, a height of 25 meters, with a trunk nearly a meter in diameter. Its bark is dark brown, rather thin, and nearly smooth. The young twigs are loosely hairy, soon becoming smooth. The buds are smooth, glutinous, narrow, blunt, 8 to 10 mm. long. The leaves are broadly oval to orbicular or obovate, thick, dark green, dull, often blunt at both ends, but com- monly more or less narrowed at the base, toothed or doubly toothed, glutinous,. Fig. 225. — European Please note that these images are extracted from scanned page image
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