. 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. 3i8 The Oaks they are thick, stiff and leathery, dark green, very shining, smooth or slightly hairy with raised midrib above; paler, dull, smooth or hairy, at least along the prominent midrib, and obscurely net- veined beneath, persistent until spring when the new leaves begin to unfold. The leaf-stalk is stout and sUghtly hair)', 2 to s mm. long. The stami- nate flowers are in hairy catkins 5 to cm. long; their calyx
. 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. 3i8 The Oaks they are thick, stiff and leathery, dark green, very shining, smooth or slightly hairy with raised midrib above; paler, dull, smooth or hairy, at least along the prominent midrib, and obscurely net- veined beneath, persistent until spring when the new leaves begin to unfold. The leaf-stalk is stout and sUghtly hair)', 2 to s mm. long. The stami- nate flowers are in hairy catkins 5 to cm. long; their calyx, which is 5- to 7-lobed, is hairy and hght, yellow. The pistillate flowers are sessile or on stout hairy stalks, the involucres also hairy; styles shghtly spreading. The fruit ripens from July to September of the first season, is sessile or nearly so; nut oblong or narrowly ovoid, 12 to 20 Fig. 's Oak. ^^^ j^j^g^ ^^^^ ^j.^^ ^j^en ripe, the apex hairy; shell thin, white downy inside; cup hemispheric, 10 to 12 mm. across, hair}' inside, embracing about one third of the nut, its scales ovate, pointed, light brown and hairy. The wood is rather soft, strong but brittle, close-grained, dark brown; its specific gravity is about The sweet nuts are of commercial importance to the Indians and Mexicans of our southern border, where they are sold for food in the markets under the name of 35. TEXAN WHITE OAK — Quercus breviloba (Torrey) Sargent Quercus obtusifolia breviloba Torrey. Quercus Durandii Sargent, not Buckley Usually a shrub, this oak sometimes becomes a tree 9 meters tall, with a trunk diameter of 4 dm. It grows in hmestone soil in central and western Texas and adjacent Mexico, and as a shrub forms dense thickets. It is also called White oak, Pin oak, and Shin oak. The trunk is usually divided very near the base into several principal branches. The bark is about 6 mm. thick, grayish white or gray-brown, separating into thin, loose elongated scales. The
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