. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 180 SHAD BUSH Amelanchier canadensis, (Linnaeus) Mendicus GENUS DESCRIPTION—The genus Amelanchier comprises about 30 species of small trees and shnibs found mainly in the temperate portion of the northern hemisphere. About 23 species are found in North America. 6 of which attain tree-size. Four species are native to Pennsyl- vania, only 1 of which attains tree-size. FOBM—A small tree usually 10-25 ft. In height with a diameter of 6-12 inches but may reach a height of 40 ft. with a diameter of 20 Inches. Trunk usual
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 180 SHAD BUSH Amelanchier canadensis, (Linnaeus) Mendicus GENUS DESCRIPTION—The genus Amelanchier comprises about 30 species of small trees and shnibs found mainly in the temperate portion of the northern hemisphere. About 23 species are found in North America. 6 of which attain tree-size. Four species are native to Pennsyl- vania, only 1 of which attains tree-size. FOBM—A small tree usually 10-25 ft. In height with a diameter of 6-12 inches but may reach a height of 40 ft. with a diameter of 20 Inches. Trunk usually straight, slender, with little taper, btaring a shallow and narrow crown appearing very dense on account of abundant fine sprays of branclilets. BAEK—Rather smooth on young and old specimens. On older specimens there Is a tendency to roughen tlirough shallow, longitudinal, sometimes diagonal flsstireg which are rather dark and separate broad, lighter, and smooth ridgos becoming scaly near the base. TWIGS—Slender, somewhat zigzag, bright green to purplish-brown, smooth or often overlaid with a grayish fllnvlike coating which peels off; covered with a few, pale, scattered lenticels; pith small, greenish, angular. BUDS—Alternate, usually 2-ranked, slender, conical, J-J of an inch long, 3-4 times as long as broad, sharp-pointed, greenisli-brown often tinged with purple, sometimes smooth, often hairy towards apex and along bud-scales. Terminal buds longer than lateral which are usually appressed close to twig, sometimes remaining very small. Bud-scales largest near base, often 3-ner^'ed, darker and finely hairy along margin. LEAVES—Alternate, single, ovate to ovate-oblong, 3-4 inches long, sharp-pointed at apex, round or heart-shaped at base, finely and sharply serrate on margin, at first hairy, later smooth, dark green above, paler below. LEAF-SCARS—Alternate, usually 2-ranked, small, Inconspicuous, rather linear, with projecting bundle-scars which are large and 3
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