. Circular. Agriculture; Agriculture -- United States. SEEDS OF QUACK-GKASS AND OF CEETAIN WHEAT-GRASSES.. V. Fig. 4.—Splkelets of quack-grass, showing different forms. Note the forms of the ghimes in o, 6, c, d, and the awned fonn of glumes and seeds shown in d; e, edge view of spikelet. (Enlarged.) along with the comparatively few individual seeds in samples of brome-grass seed containing seeds of quack-grass. SLENDER WHEAT-GRASS (aGROPYRON TENERUM, VASEY). The spikclets of slender wheat-grass (fig. 6) vary from one-half to three-fourths of an inch in length and contain four to seven seeds.
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. Circular. Agriculture; Agriculture -- United States. SEEDS OF QUACK-GKASS AND OF CEETAIN WHEAT-GRASSES.. V. Fig. 4.—Splkelets of quack-grass, showing different forms. Note the forms of the ghimes in o, 6, c, d, and the awned fonn of glumes and seeds shown in d; e, edge view of spikelet. (Enlarged.) along with the comparatively few individual seeds in samples of brome-grass seed containing seeds of quack-grass. SLENDER WHEAT-GRASS (aGROPYRON TENERUM, VASEY). The spikclets of slender wheat-grass (fig. 6) vary from one-half to three-fourths of an inch in length and contain four to seven seeds. Both glumes and seeds may be slenderly acute or short awned at the apex. The glumes may diverge somewhat in mature spikelets, but they are commonly nearly parallel and curved at the back, the tips curving inwardly over the seeds, which exceed the glumes scarcely at all or by as much as one-third the length of the glume. The spikelets usually taper from the center to both ends both facewise and edgewise, the two faces being une([ually convex, the glumes being more widelv separated on the more convex face. (See fig. 6, c, d, and e.) The spikelets are generally narrower than those of quack-grass, the base being smaller as a rule. The glumes (see fig. 6) are relatively broader than those of quack-grass, five veined to seven vemed, the veins slender and distinct, the middle or keel vein scarcely coarser than the adjacent ones, and the glume rounded at the back rather than keeled or angled. The thin, pa[)ery margins of the glumes narrow gradually to the tapering or awned apex. ]hiture spikelets of slender wheat- grass tend to break apart readily, only occasional complete spike- lets appearing in commercial samples of seed. Empty glumes (see fig. 6, a) often remain united and appear both free from and attached to a part of the seed-cluster axis. As an impurit}' of brome-grass seed, slender wheat-grass, therefore, usualh' a])pears as free seed, with occasional spikelets or glumes t