230 



Fig. 224, CATHESTECUM PROSTKATUM Pre^l, Rel. Haenk. 1 : 295. /. 1,2. 

 1830. ' {C.'erectum Vasey, Bui. Torr. Bot. Club, 11 : 37. 1884. )-An extensively 

 creeping, slender perennial, with upright flowering branches 1-3 dm. (4' -12') 

 high, narrow, flat leaves, and clustered spikelets in terminal of lateral racemes. 

 Clusters (o) about 5 mm. {2h") long, of three, rarely four, 2-flowered spikelets 

 (b) ; awns 1-4 mm. (^"-2") long, empty glumes very unequal, the first (rZ) trun- 

 cate about 1 mm. (i") long, the second (c) lanceolate, 2-3 mm. (l"-l-i") long; 

 flowering glumes {g) 2 to 4-lobed with three nerves produced in short awns at the 

 sinuses is shown by /.—Dry mesas and bluffs along the Rio Grande, western 

 Texas. (Mexico.) July to October. 



