AGKOSTIDE.E. 381 



narrow and involute. The presence of awns is more conspicuous 

 in tlie dwarf forms; the upper jialet does not api)ear to be asso- 

 ciated with any other character. Tlie following are names which 

 have been given to forms of this species: J. f/ntudis Trin., spike- 

 let slender, 10-20 cm. long, A. a.yx'rifoh'n Trin., A. palh'nx 

 Trin., A. Cdh'furnica Trin., A. mirrophiiJhi Steud." Dr. (J. 

 ThnrberS. Wats. liot. Calif. 3:273 (ISSO). 



18. A. varians Trin. Fund. Agrost. 3:60 (1841). A. hnimtUs 

 Vasey, liull. Torr. Club, 10:31 (1883). .1. lioxsm Vasey. 



A slender erect tufted perennial, 10-40 cm. high. Sheaths 

 striate, smooth, longer than the intcrnodes; ligulo 3-3 nun. long; 

 blades scabrid above, often involute, 1-3-8 cm. long, 1 mm. wide. 

 Panicle often dark purple, 3-7 cm. long, 5-8 mm. broati, rays 1-3 

 cm. long. Spikelets 2-3.5 mm. long, rough on the keels; floral 

 glume 1.5-1.7 mm. long, awnless, broad, truncate, toothed, 4- 

 norved above, 5-nerved below; i)alea 0. 



^lexico, Pr ingle 143!; Oregon, Hoii'vU 4G31, CusirTc 797; 

 Califonua, Pr!n<jJe in 1883; ]\rontanp Anderson at Great Falls. 



Montana, Oregon, California, and Mexico. 



19. A. tenuis Vasey, Bull. Torr. Club, 10: 31 (1883). 



An erect slender tufted perennial, 15-35 cm. high. Ligule 

 about 2 mm. long; blades about 3 to the culm, flat, nearly smooth. 

 3-G cm. long, 1-1.5 mm. wide. Panicle pyramidal, thin, 5-8 cm. 

 long; rays capillary in half- whorls of 3-8, or 3 or single above, the 

 longest 3-5 cm. long, flower-bearing above the middle. Spikelets 

 tinged with purple, 3-3.5 mm. long; empty glumes acute, first 

 toothed on the keel, a little the longer; floral glume awnless, 1.3- 

 1.4 mm. long, thin, oval, obtuse, 5-nerved [3-nerved in original 

 description]; palea 0. 



Oregon to southern California. 



30. A. fasciculata (11. B. K.) R. & S. Syst. 3:3G3 (1817). 

 Yilfa fascicuJafa II. B. K. Nov. fien. et Sp. 1: 139 (1815). 



Culms ascending, 15-30 cm. high, froni creeping rootstocks. 

 Sheaths longer than the internodes; ligule truncate, 3.5 mm. long; 

 blades flat, scabrous, 3-6 cm. long, 3-2.5 mm. wide. Panicle 

 linear to elliptical, brown and purple, 4-7 cm. long; rays in half- 



