Trees of Texas: An Illustrated Manual of the Native and Introduced Trees of the State

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University of Texas, 1915 - 169 pāgines
 

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Pāgina 13 - ... sides of the swifter streams. The volume of material thus lost to the land is increasing with settlement and cultivation ; it is almost wholly washed from the surface and is the very richest soil material, the cream of the soil. The value of the material is not easily fixed, but at a moderate appraisal the annual loss would exceed all the land taxes of the country. Besides impoverishing the soil, the sediment pollutes the waters, reducing their value for domestic and manufacturing purposes and...
Pāgina 73 - ... reddish or chestnut brown, the inner scales hairy, and the outer more or less hairy on the margins; leaves oblong or obovate, 8-22 cm. (3-9 inches) long, generally wedge-shaped at the base, sometimes truncate or rarely slightly cordate, divided into 5-11 lobes, commonly 9, lobes generally extending about half way to the midrib, lobes wedge-shaped, tapering from the base and mostly 3-toothed at the apex and tipped with long bristles, hairy when they unfold, becoming smooth and a dull dark green...
Pāgina 54 - ... inch) long; flowers appear in April or May. Variety falcata (Pursh) Torrey is a form with narrower and more curved leaves. Distribution. New Brunswick west to North Dakota, south to Florida and west to Texas. More or less frequent throughout Indiana on the banks of streams and on the borders of lakes and swamps. On the low borders of some lakes and rivers it forms the principal stand on considerable areas. In this State it is usually a small crooked tree, except in the southwestern counties,...
Pāgina 12 - ... straggling detachments, of which only the hardier push onward along the prairie streamways or up the deeper canyons of the hills. It is a striking phenomenon, this breaking up and gradual dwindling away of so vast and vigorous a forest. Not only in Texas, but far to the north, through the Indian Territory, Kansas, Nebraska, and the Dakotas, the same thing may be seen. Like a vast wave that has rolled in upon a level beach, the Atlantic forest breaks upon the dry plains — halting, creeping forward,...
Pāgina 15 - Darwin elaborated the new conception — that a species is simply a congregation of individuals which are more like each other than they are like any other congregation — and with a freedom from prejudice which is rarely attained even by his most devoted adherents, he declared that " one new variety raised by man will be a more important and interesting subject for study, than one more species added to the infinitude of already recorded species.
Pāgina 11 - River by the drier climate of the southwest. Here its vanguard is broken into straggling detachments, of which only the hardier push onward along the prairie streamways or up the deeper canyons of the hills. It is a striking phenomenon, this breaking up and gradual dwindling away of so vast and vigorous a forest. Not only in Texas, but far to the north, through the Indian Territory, Kansas, Nebraska, and the Dakotas, the same thing may be seen. Like a vast wave that has rolled in upon a level beach,...
Pāgina 76 - It occurs in east Texas and in rocky ravines and mountains near the mouth of the Pecos.
Pāgina 49 - ... inches) long, taper pointed at the apex, hairy at first, becoming at maturity glabrous and a dark yellow-green above, paler or a yellow-brown and smooth or with a few hairs in the axils of the veins beneath; fruit generally obovoid, varying to subglobose or elliptic, generally about 3-4 cm. (about 1J4 inches) long, sutures elevated, usually somewhat depressed at the apex, husk rather thin, tardily separating, usually to nearly the middle, sometimes merely breaking open; nut varying from obovoid...
Pāgina 17 - Tips. 1. Acuminate. 2. Acute. 3. Obtuse. 4. Truncate. 5. Retuse. 6. Emarginate. 7. Obcordate. 8. Cuspidate. 9. Mucronate.

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