. Circular. Agriculture; Agriculture -- United States. 8 SEEDS OF QUACK-GRASS AKD OF CERTAIN WHEAT-GRASSES. WESTERN WHEAT-GRASS (aGROPYROX OCCIDENT ALE, SCRIBX.). Well-developed spikelets of western wheat-grass (see fig. 7, a) are larger than those of either quack-grass or slender wheat-grass, often equalmg an inch in length, but are commonly between five-eighths and three-fourths of an inch in length, lance shaped and compressed facewise. The slender " glumes are more or less divergent, exposing the lower seeds. In the larger spikelets the seeds ex- ceed the glumes equal to the length of
. Circular. Agriculture; Agriculture -- United States. 8 SEEDS OF QUACK-GRASS AKD OF CERTAIN WHEAT-GRASSES. WESTERN WHEAT-GRASS (aGROPYROX OCCIDENT ALE, SCRIBX.). Well-developed spikelets of western wheat-grass (see fig. 7, a) are larger than those of either quack-grass or slender wheat-grass, often equalmg an inch in length, but are commonly between five-eighths and three-fourths of an inch in length, lance shaped and compressed facewise. The slender " glumes are more or less divergent, exposing the lower seeds. In the larger spikelets the seeds ex- ceed the glumes equal to the length of the latter, making the larger spike- lets twice as long as the glumes. The seeds are narrowly acute or awn pomted at the apex. The glumes (see fig. 7) are stifnsh, narrowly lance shaped, and a^\^l pointed, three vemed or five veined, the middle vein somewhat coarser than the others, giving the glumes a slightly keeled form, the veins distinct or often obscure. The margins of the glumes are thin and papery, chiefly below the middle, and taper gradually to the pointed apex. .I""-.; J-I d >v\^> v^. Fig. 6.—Emptygliimes(f;)and spikelets of slender wheat-grass. Note the fonns of the glumes: c, d, Opposite sides of a spikelet, showing the relative position of the glumes, d being the inner, more convex side; e, edge view. (Enlarged.). Fig. 7.—Spikelets and glumes of western wheat-grass: a, One of the larger spikelets having the maxl- mum number of seeds; 6 and d, small spikelets havmg few seeds; c, edge view of a spikelet; c, free, empty gliraies; /, empty glumes attached to a portion of the cluster axis. Note the form of the glumes. (Enlarged.) Mature spikelets of western wheat-grass break apart readily, the seeds separating from the glumes. Snmples of commercial seed, such as brome-grass seed, containing seed of western wheat-grass have few empty glumes (fig. 7, e), some of wliich may remain attached to the spikelet axis (fig. 7, /). [Cii-. 73]. Please note that
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