. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 176 COCKSPUR THORN Crataegus Crus-galli, Linnaeus GENUS DESCRIPTION—Tlie genns Crataegus has the center of Its distribution In eastern North America. It reaches its best development in the groat limestone formations rather common in this part of America. Prior to 1900 fewer than 75 species were Icnown in the world, of which number about 30 were native to North America. At the present time about 700 species of trees and shrubs belonging to this genus have been described. In the State of New York alone 218 species ha
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 176 COCKSPUR THORN Crataegus Crus-galli, Linnaeus GENUS DESCRIPTION—Tlie genns Crataegus has the center of Its distribution In eastern North America. It reaches its best development in the groat limestone formations rather common in this part of America. Prior to 1900 fewer than 75 species were Icnown in the world, of which number about 30 were native to North America. At the present time about 700 species of trees and shrubs belonging to this genus have been described. In the State of New York alone 218 species have been described. Porter, in his Flora of Pennsylvania, published in 1903, records 16 species as native to this State. Only 2 species are described in this bulletin Itecause they are practically of no commercial importance and very difficult to identify. FORM—A small tree sometimes reaching a height of 25 ft. with a diameter of 10-12 inches. Trunk short, bearing stoqt and spreading branches which form a broad and rather flat crown. BARK—Grayish to reddish-brown, sometimes roughened by sm-all scales. TWIGS—Smooth, rather slender, at first greenish, later light brown to gray, usually bearing straight or slightly curved and unbranched chestnut-browm thorns about 3 Inches long, BUDS—Alternate, i of an Inch long, often almost spherical, very blunt-pointed, terminal bud usually present and about the same size as the laterals. Lateral accessory buds are often found at the bases of thorns. Blids are covered with numerous, thick, blunt-pointed, chestnut- brown scales. LEAVES—Alternate, simple, obovate to elliptical, 1-3 inches long, long-tapering at base, rounded or short-pointt-d at apex, sharply serrate on margin except towards base; smooth, thick, and shiny on the upper surface when full grown. Petioles short and broad. LEAF-SCARS—Alternate, more tiian 2-ranked, small, cresent-shaped, containing 3 bundle- scars. FLOWERS—Appear about June when leaves are fully develop
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