228 



Fig 222 PAPPOPHORUM APERTUM Scribn. Bui. Torr. Bot. Club, 9 : 148. 

 1882.-A c^spitose perennial 3-9 dm. ( P-SO) high, with long, narrow, mostly in- 

 volute leaves and narrow, pale, or often straw-colored panicles lo-20 cm. (6-8 ) 

 long. Sheaths about equaling the internodes, slightly hispid; l^^^e a rather 

 conspicuous hairy ring, 3-4 mm. (1--2") long; leaf-blades 10-25 cm. 4-10 ong 

 about 4 mm. (2") wide. Spikelets (a) 3 to 5 flowered, 6-8 mm. (3"-4") ong 

 empty glumes unequal, acute, hyaline, 1-nerved; flowering glume (be) 

 7-nerved, pubescent, the nerves terminating in awns about the length of the 

 glume, with nearly as many aristiform lobes in the intervals. Palea ^^^) 3 mm. 

 \U") l^ng, lanceolate, 2-keeled.-Valleys, western Texas to Arizona and Mex- 

 loo. June. 



