376 POACE^. 



bearing between them a hairlike awn; empty glumes equal or sub- 

 equal, niucronate or obtuse, 3.5-4 mm. long, hispid on the keels, 

 first narrowly oblong, 3-nerved, second obovate, 5-nerved; floral 

 glume of first floret narrowly oval, tuberculate-roughened, 3.5 mm. 

 long, 3-nerved, terminating in two acute teeth and bearing a straight 

 scabrous awn a little below the tip, 2 mm. long, teeth of second 

 and third florets prolonged into slender seta?, awn twisted and bent 

 one-third the way from the tip and 3-4 mm. long; palea about 

 two-thirds as long as its glume. Grain smooth. 



Named for the late Eliliu Hall, in whose Texan collection 

 (1872) it was distributed under Xo. 799, mixed with Trisetum elon- 

 gatum Kth. [T. interruptum Buckl.), Xo. 3546* of Curtiss's distri- 

 bution of 1883, to which it is closely allied and which it much re- 

 sembles in habit, but from which it differs essentially in its broader 

 and obtuse outer glumes, and in having the lowest awn straight and 

 shorter than the others. 



Texas (Brazos County), Nealley in 1883. 

 6. T. elongatum (H. B. K.) Kunth, Eev. Gram. 1:101 (1829). 

 Avena elongata H. B. K. Nov. Gen. et Sp. 1: 148 (1815). T. in- 

 terrwptum Buckl. Proc. Acad. Phila. 100 (1862). T. Californicum 

 Vasey. 



Culms slender, branching, 20-50 cm. high. Sheaths frequent- 

 ly including the base of the panicles; blades flat and narrow, those 

 of the culm 2-7 era. long, often puberulous. Panicle simple, 4-10 

 cm. long, 1 cm. broad, dense or interrupted with spikelike branches. 

 Many of the spikelets 2-3-flowered, sessile on the branches, where 

 there are 5-7, one at a node, on alternate sides of the slender rachis. 

 Empty glumes subequal, mucronate or acute, ovate-lanceolate, 3.5- 

 4.5 mm. long, first 3-nerved, second 5-nerved, nerves prominent; 

 floral glume scabrous, elliptical-lanceolate, 4-5 mm. long. 5- (some- 

 times 3-4-) nerved, bearing a bent awn one- third or two-fifths the 

 way below the acuminate or cuspidate points ; palea narrow, hya- 

 line, bifid, about half the length of its glume. Grain smooth, 2 

 mm. long. 



Arizona, Pringle; Lower California, Orcutt. 



Texas, Arizona, New Mexico, southern California. 



