. 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. California Rock Oak 323 side, thin and embracing about one fourth of the nut, covered by thin, ovate, imbricated hairy scales not corky-thickened on the back. The wood is hard, close-grained and hght brown. 41. CALIFORNIA ROCK OAK — Qnercus Douglasii Hooker and Amott A tree of dry hills and moimtain sides of west central California, southward to Kern county, attaining a maximum height of 36 meters, with a trunk diameter o


. 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. California Rock Oak 323 side, thin and embracing about one fourth of the nut, covered by thin, ovate, imbricated hairy scales not corky-thickened on the back. The wood is hard, close-grained and hght brown. 41. CALIFORNIA ROCK OAK — Qnercus Douglasii Hooker and Amott A tree of dry hills and moimtain sides of west central California, southward to Kern county, attaining a maximum height of 36 meters, with a trunk diameter of meters, but often reduced to a shrub in its southern range. The branches are short and stout, the lower widely spreading, the tree usually round-topped and broad. The bark is up to cm. thick, pale gray or nearly white, and somewhat scaly. The twigs are stout, very brittle, softly woolly during the first season, becoming less hairy, gray or brown, finally smooth. The winter buds are ovoid, blunt, 3 to 6 mm. long, reddish and hairy. The leaves are very variable, oblong, oval or obovate, 5 to cm. long, pointed or rounded at the apex, narrowly or broadly rounded, or heart-shaped at the base; the 4 to 7 lobes are broad or narrow, sharp-pointed, bristle-tipped or rounded, the sin- uses deep or shallow, acute or rounded at the bottom; they are sometimes entire except for a few teeth toward the apex, thin, but firm and stiff, bluish green with scattered hairs and raised rounded midrib above, paler or yellowish green, softly hairy and more or less conspicuously reticulate veined be- neath. Tl^y fall in the late au- tumn; the leaf-stalk is stout, grooved, 6 to 12 mm. long. The flowers appear from February to May. The staminate catkins are hairy, about 3 cm. long; calyx hairy, deeply lobed and yellowish green; stamens exserted, their anthers oblong, notched, smooth and yellow. The pistillate flowers are solitary or several together; involucre hairy; styles short and sprea


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