Barley Tribe 59 



39. AGROPYRON J. Gaertn. Wheat-grass. 



Animal or perennial grasses with flat or involute 

 leaves and terminal -pike-. Spikelets 3-many-flowered, 

 sessile, single and alternate ,-it each notch of the rachis, 

 the sides of the spikelet turned toward the rachis. The 

 Lower glumes empty, narrower and usually shorter than 

 the flowering glumes, acute or awned; flowering glumes 

 rigid, rounded on the back, 5-7-nerved, usually acute or 

 awned at the apex. Palea 2-keeled, the keels often 

 ciliate. Stamens 3. Styles very short, distinct, drain 

 pubescent at the apex, usually adherent to the palea. 



1. A. Parishii Scribn. & Smith. Culms 5-10dm. high, smooth, 

 retrorsely pubescent on the nodes; sheaths pubescent below, 

 sparingly ciliate on the margins, the lower shorter, the upper 

 longer than the internodes; leaves smooth below, scabrous above 

 and on the margins, the lower 1-2 dm. long, the uppermost 2.5-5 

 cm. long, 4-6 mm. wide at the somewhat constricted base, linear 

 attenuate ; spike composed of 8-12 compressed oblanceolate spike- 

 lets; spikelets 5-7-flowered, 16-20 mm. long, shorter than the 

 internodes of the rachis, these scabrous on the margins; empty 

 glumes -3 as long as the spikelet, nearly equal, linear, acute 

 or acuminate, 5-nerved, scarious on the margins; flowering 

 glume lanceolate, acute, 9-11 mm. long, 5-nerved and scabrous 

 above, minutely 3-toothed, awnless or awned; awn straight, 

 slender, 6-8 mm. long; palea equaling its glume, acute or obtuse. 



Occasional in the San Bernardino Mountains. First collected in Water- 

 man's Canyon by S. B. Parish. 



2. A. Parishii laeve Scribn. & Smith. Habit of the type, but 

 nodes and sheaths glabrous ; awns equaling or exceeding the 

 glumes in length. 



Ballona Creek, near Mesmer: Santa Ana Mountains ; San Bernardino 

 Mountains. First collected in the Cuyamaca Mountains by Palmer. 



40. HORDEUM L. Barley-grass. 



Annual or perennial grasses, with flat leaves and ter- 

 minal cylindric spikes. Spikelets 1-flowered, usually in 

 3's at each joint of the rachis, the lateral generally short 



