. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. ill PLATE XLVIII. AMERICAN HOP HORNBEAM. ] ; braiuh with immature leaves, (s) staiuinate tlowers. (p) pistillate flowers. X 2" witli mature h-aves and Iiop-like fnnt flusters, x i. 3 A SM'd with inclosinti iiieniliraiie. slifrlitly enhirpMl 4' A seed with part of inelcsin^r slightly enlarged. 5* A witli partly develoi'ed ternnnal staminate auients, x i. c! Seetiuu of viiiter twij,', enlarged. AMERICAN HOP HORNBEAM. Ostrya virginiana, (Miller) K. Koch.
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. ill PLATE XLVIII. AMERICAN HOP HORNBEAM. ] ; braiuh with immature leaves, (s) staiuinate tlowers. (p) pistillate flowers. X 2" witli mature h-aves and Iiop-like fnnt flusters, x i. 3 A SM'd with inclosinti iiieniliraiie. slifrlitly enhirpMl 4' A seed with part of inelcsin^r slightly enlarged. 5* A witli partly develoi'ed ternnnal staminate auients, x i. c! Seetiuu of viiiter twij,', enlarged. AMERICAN HOP HORNBEAM. Ostrya virginiana, (Miller) K. Koch. GENUS DESCRIPTION—This genus comprises about 4 species which are widely distributed In the northern hemisphere. Two species are native to America and 2 to the eastern hemisphere. One of the American spocies is more limited in its distribution than any other known tr«e, being found only in the Grand Canon 6f the Colorado River in Arlaonti while the other American species is rather widely distributed over the eastern part of the country., FORM—Usually attains a height of 20-30 ft. with a diameter of li ft., but may reach a height of 60 ft. with a diametsr of 2 feet. Crown high, open, ajid very broad, formed by widely spreading often drooping branches with ascending branchlets. BARK—Grayish-brown, thin, roughened by loose flattlsh scales which are loose at the ends. See Fig. 54. TWIGS—Slender, tough, dark reddish-brown, zigzag, at first hairy and green, later «mo«th, lustrous, dark brown. BUDS-Alternate, axMlary; terminal bud absent; ovate, i of ati inch long sharp-pointy, distinctly divergent, slightly pubescent, smooth, gummy, covered by about 8 visible, longl- ftidlnally striated, 4-ranked scales which increase in size from the base towards the apex. LEAVES—Alternate, simple, ovate-oblong, acute at apex, doubly-serrate on margin, rounded or heart-shaped or wedge-shaped at base, 3-5 inches long; dull yellowish-green above, paler green below. LEAF-SCARS—Alternate,
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