AGKOSTIDE.E. 331 



narrow and involute. The j)resence of awns is more conspicuous 

 in the dwarf forms; tlie upper i^alet does not appear to be asso- 

 ciated with any other character. The following are names which 

 have been given to forms of this species: A. f/nfndis Triu., spike- 

 let slender, 10-20 cm. long, A. aspcrifuJia Trin., A. paUens 

 Triu., A. Call for nica Trin., A. micvoplnjlla Steud." Dr. G. 

 Thurber S. Wats. Bot. Calif. 2:273 (1880). 



18. A. varians Trin. Fund. Agrost. 2:66 (1841). A. ImmuJis 

 Vasey, Bull. Torr. Club, 10: 21 (1883). A. Uossm Vasey. 



A slender erect tufted perennial, 10-10 cm. higli. Sheaths 

 striate, smooth, longer than the internodes; ligule 2-3 mm. 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. broad, rays 1-3 

 cm. long. Spikelets 2-2.5 mm. long, rough on the keels; floral 

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

 nerved above, 5-nerved below; palea 0. 



Mexico, Pringle 1421; Oregon, Hoicell 4631, Cnsick 797; 

 California, Pringle in 1882; Montana, Anderson at Great Falls. 



Montana, Oregon, California, and Mexico. 



19. A. tenuis Yasey, Bull. Torr. Club, 10: 21 (1883). 



An erect slender tufted perennial, 15-25 cm. high. Ligule 

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

 3-6 cm. long, 1-1.5 mm. wide. Panicle pyramidal, thin, 5-8 cm. 

 long; rays capillary in half- whorls of 3-8, or 2 or single above, the 

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

 tinged with 2)urple, 2-2.5 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. 



20. A. fasciculata (II. B. K.) K. & S. Syst. 2:362 (1817). 

 Vilfa fasciculata H. B. K. Nov. Gen. et Sp. 1: 139 (1815). 



Culms ascending, 15-20 cm. high, from creeping rootstocks. 

 Sheaths longer than the internodes; ligule truncate, 2.5 mm. long; 

 blades flat, scabrous, 3-6 cm. long, 2-2.5 mm. wide. Panicle 

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



