American grasses, Issue 7

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U.S. Government Printing Office, 1900
 

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Page 109 - ... glumes nearly equal in length, the first about one-half as long as the flowering glume, 1nerved, acute, or erose at apex, the second a little longer than the first, 3-nerved and 3-toothed, rarely entire at the apex ; flowering glume pubescent or scabrous on the back, ciliate on the margins; awn flexuous 8-16 mm.
Page 66 - Vasey, Contr. US Nat. Herb. 3 : 37. 1892. The species is longer-awned than the plant here figured.— Almost everywhere in the United States in barnyards, waste ground, and river banks. (Throughout the warmer regions of both hemispheres.) Flowers all summer. Of some value In the South, where by its spontaneous growth it often yields a fair hay crop. The form...
Page 28 - P. platycaule Poir. ) LOUISIANA or CARPET-GRASS.— A slender, erect, or more frequently prostrate and extensively creeping perennial, rooting at the nodes and sending up numerous leafy or flower-bearing branches 1.5-6 dm. (6'-24') high, with 2 to 6 subdigitate slender, approximate spikes 7-10 cm.
Page 66 - Spikelets (a, 6) 2-3 mm. (1"-H") long, densely and irregularly crowded in three or four rows along one side of the axis; first glume one-fourth to onehalf as long as the third; second and third glumes pubescent or muricate-hispid along the nerves, the second awnless or short-awned, the third awnless or with a long rigid awn.
Page 4 - DESCRIPTIONS OF THE SPECIES. METRIC MEASUREMENTS AND THEIR ENGLISH EQUIVALENTS. The metric system adopted in this bulletin is now quite generally employed in botanical and other scientific publications. For those unfamiliar with this system the English equivalents are added in parentheses, the signs for feet, ' for inches, and " for lines or twelfths of an inch, being used.
Page 74 - SC, and cities to the south near the coast. It is propagated by cuttings or sets, and quickly covers the most sandy yards with a dense carpet of perennial verdure. In South America the creeping stems are employed in medicine as a diuretic, as are the stems and rhizomes of couch grass in the United States.
Page 191 - Michx. Fl. Bor. Am. 1 : 59. 1803; Bouteloua racemosa Lag. Varied. Cienc. Lit. Art. a* : 141. 1805.) TALL GRAMA or SIDE OATS. — A densely tufted perennial 3-9 dm. (l-3) high, with numerous (twenty to sixty), usually spreading or reflexed spikes scattered along the common axis, forming a long, somewhat one-sided raceme 20-40 cm. (8'-16') long. Sheaths loose, sparsely pubescent; leaf-blades 10-30 cm. (4'-12') long, 4 mm. (2") wide, scabrous. Spikes (a) 6-16 mm. (3"-8") long, reflexed. Spikelets...
Page 282 - Rachilla pubescent; empty glumes unequal; flowering glumes (c) awnless or very short awned, with a rather broad, searious margin at the obtuse or emarginate apex.— A native of Europe, introduced and cultivated in many parts of the United States for hay. June, July. The strong, perennial character of this grass and its unusual drought-resisting powers are qualities which recommend it for general cultivation, particularly in the semiarid regions of the West and Northwest, and it is one of the most...
Page 176 - ... surfaces, rough on the margins, the uppermost one wanting or less than I cm. long : inflorescence finally long-exserted, the axis 2.5 cm. or less long; spikes 10—25, erect or somewhat spreading, 6—15 cm. long: spikelets about 2 mm. long : scales 4 ; first scale boat-shaped, acute, about one half as long as the second, which, exclusive of the awn, is 1.5 mm. long, oblong, in side view about .3 mm. wide, minutely and irregularly toothed at the truncate apex, hispidulous on the outer surface,...
Page 83 - A slender, sweet-scented, stoloniferous perennial, 3-6 dm. (l-2) high, with short culm-leaves and brownish, open panicles 4-10 cm. (H'-4') long, branches in pairs. Spikelets (a) yellowish-brown and purple, 4-6 mm. (2"-3") long; first and second glumes thin, subequal, glabrous; the third and fourth hairy and awn-pointed, the fifth hairy at the apex and inclosing a perfect flower. At 6 is shown a spikelet with the first pair of glumes removed; c, the palea with three stamens; d, pistil. The flat...

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