I'OACE.E. 

 '«ic^S>--~ 30^A^J$chi«dianaTiiii. cS^ Uupr. Mem. Acad. St. Potersb. (VI.) 



A stm{,'<j:liu«; })eruiinial, soinotiinosi spiiringly briiiu'liiiig, G0-!)0 

 cm. liiyli. Slictiths usually shorter than the intcrnodes; li<fulc 

 short; leaves of sterile shoots few, those of the culm 3— i in number, 

 scabrous, fiat or involute, setaceous above, *^0-3() cm. long. Pani- 

 cle little cxserted, thin, widely spreading, '^0-40 cm. long, rays 

 slender, in twos and threes, or even fours, llower-bearing from 

 near the middle; some of them 8-i;J cm. long. Spikelets few, 

 appressed to the branches, em])ty glumes awidess, 1-nerved, nearly 

 ccpial. !»-li mm. long; Horal glume spotted, hispid, scabrous above, 

 11-20 mm. long to the aduate lateral awns; middle awn about 10 

 mm. long, twisting at the base when mature. 



Mexico, Priiif/h' 387 ; Lower California, Palmer 2G8. 



Texas to Arizona, ^rexico, and Lower California. 



Var. minor Vasey, Bull, 'i'orr. Hot. Club, 13: 28 (1880). Culms 

 30-50 cm. high; panicle 12-18 cm. long; rays single, but dividing 

 immediately. Vasey thinks it might bo considered a distinct 

 species. 



Arizona, Pn')n/Je, Jones in 188-1. 



31. A. Oreuttiana Vasey, liull. Torr. Club, 13:27 (1886). 



A leafy tufted perennial, stout below, slender above, 40-()0 cm. 

 high. Sheaths longer than the intcrnodes; ligule very short and 

 ciliate at the throat; leaves of sterile shoots numerous, blades tar- 

 dily involute, 2-3 mm. wide, those of the culm narrower, 20-30 

 cm. long. Pani(^le exserted, open, 10-12 cm. long, rays distant, 

 flexuose, usually single, some of the longest 8 cm. long. First 

 glume 3-nerved, 10-12 mm. long, second 1-nerved, 7 mm. long; 

 lloral glume spotted, 12 mm. long to the apex of the iulhereut 

 lateral awns, central awn twisted and bent when dry, about 5 mm. 

 long. 



Arizona, Jones 4233 ; Southern California, Orciitf ; Mexico, 

 Fn'ngle 38(5, Palmer 709. 



32. A. manzanilioana Vasey, Contrib. U. S. Nat. Herb. 1:282 

 (1893). 



