File:American grasses (1897) (17527629173).jpg

Title: American grasses
Identifier: americangrasses03scri (find matches)
Year: 1897 (1890s)
Authors: Scribner, Frank Lamson, 1851-1938
Subjects: Grasses
Publisher: Washington : Gov. Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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106
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Fig. 80. Bouteloua oligostachya (Nutt.) Torr. BLUE GRAMA.—a, The empty glumes of a spikelet; b, a spikelet with the empty glumes removed, showing the 3-awned flowering glume, its palea, and the pedicellate 3-awned rudiment. Figs. 194 to 207, in Bui. 7, and 500 to 502, in Bui. 17, illustrate other species of this genus. 80. BOUTELOTJA Lag. Varied. Cienc. Litt.Art. 2*: 141. 1805. Spikelets 1-to 2-flowered, numerous (rarely 2 or 3 or only 1), crowded and closely sessile in 2 rows along one side of a continuous flattened rachis, which usually projects beyond the spikelets; rachilla articulated above the empty glumes, the con- tinuation beyond the hermaphrodite lower floret usually bearing a few rudi- mentary glumes and 3 awns (rarely a staminate flower). Empty glumes 2, unequal, the lower smaller, keeled; flowering glume broader, 3-nerved, 3-to 5- toothed, or cleft, 3 of the divisions usually mucronate or awn-pointed. Palea 2-nerved and 2-toothed. Grain inclosed within the glume, but free. Usually low annuals or perennials, with narrow and flat or convolute leaves, the uni- lateral spikes few or many (rarely solitary), and nearly sessile along a common axis. Species about 30, all American, most abundant in the Southwestern States.

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