AGROSTIUE^. 



231 



flat or iuvolute, the largest "^ mm. wide, those of tlie culm 3, the 

 upper one tiliform. rigid, 3-6 

 em. long. Panicle much ex- 

 serted, open, thin, flexuose, 15- 

 20 cm. long, rays slender in 

 twos, threes or fours, some of 

 them half as long as tlie panicle, 

 bearing a few flowers above the 

 middle. Empty glumes equal, 

 green on the baek, brownish 

 towards the thin margins and 

 apex, elliptical-lanceolate, 5- 

 nerved, S-10 mm. long; floret 

 lance-obovate, flattened, pubes- 

 cent, becoming dark brown, 6 

 mm. long ; awn irregularly bent, 

 twisted for the lower half, about 

 20 mm. long; palea firm, nearly 

 as long as its glume. Stamens 3. 



Mexico, Pringle 1110. 



Arizona and Mexico. 



13. 0. fimbriata Ilemsl, 

 Biol. Centr. Am. Bot. 3:538 

 (1880). Stipafimhriata H. B. 

 K. Nov. Gen. et Sp. 1: 126 (1815). 



A slender tufted erect perennial, 50-80 cm. high. Sheaths of 

 the culms smooth, sliorter than the internodes; ligule very thin, 3 

 mm. long ; blades of the sterile shoots numerous, softly smooth, erect 

 or curved, involute, 15-40 cm. long, 1.2 mm. wide, the upper blade 

 5-10 cm. long. Panicle slightly exserted, simple, lax, secund. 10- 

 13 cm. long; rays scabrous, mostly in remote pairs in the axils of 

 the membranous bracts, the longest ray about 5 cm. long bearing 

 3-5 spikelets. Empty glumes chartaceous, oval, aljruptly pointed, 

 3-nerved, about 5 mm. long; floret 1 mm. long, oval or obovoid- 

 oval, clothed with short fuscous hairs; awn green, tortuose, irregu- 

 larly twisted. 1.5-2 mm. long. 



Fig. 42. — Oryzopsis Pringlei. 

 (Richardson.) 



Spikelet. 



