Barley Tribe 59 



39. AGKROPYRON J. Gaertn. WHEAT-GRASS. 



Annual or perennial grasses with flat or involute 

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

 sessile, single and alternate at 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 &. Styles very short, distinct. Grain 

 pubescent at the apex, usually adherent to the palea. 



1. A. Parishii Scribn. & Smith. Culms 5-10 dm. 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 % 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. HOBDEUM 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 



