GRIFFITHS—THE GRAMA GRASSES. 403 
a ring of numerous long, white hairs; spikelets about 5 to 10, not pectinate, consisting 
of 1 floret and a rudiment; glumes hispid and hairy-tufted at base, awned, the 
first 6 mm., the second 10 mm. long, the latter having an abrupt constriction above, 
the apex continued into two acuminate, awn-like teeth, 0.5 to 1 mm, long, on each side 
of the central awn; lemma 11 to 12 mm. long including awns, smooth, shining, and 
bone-like on the back, with 3 hispid, spreading awns about 5 mm. long, the lateral 
awns nearly equal to the central; palet deeply sulcate on the back and involute on the 
a 
—— 
ot pet thn 
Fia. 52.—Bouteloua megapotamica. a, Spikelet; b,c, lemma and palet of first floret; d-g, rudimentary sec- 
ond, third, fourth, and fifth florets; h, two views and cross section of caryopsis. a, Scale 2.5; b-h, scale 
5. From Arechavaleta, Montevideo. 
edges, 2-awned, 8 to9 mm. long; rudiment consisting of 2 or 3 aborted florets appearing 
like a cluster of 9 to 12 hispid awns of various degrees of rigidity, interspersed with 
delicate narrow scales a fourth as long or less; caryopsis cylindrical-obovate, 2 to 2.5 
mm. long, the scutellum covering about two-thirds of the ventral surface. (FIGURE 
52.) 
Stuckert’s no. 27, Kneucker’s Gram. Exs. 376, and Arechavaleta from Montevideo, 
are typical. The latter shows the stoloniferous character beautifully. 
