AGROSTIDE^. 217 



first oval, acute, second narrower; floral glume about 4 mm. lono^. 

 including the very short curved base, clothed -with very short 

 hairs; awn twice bent, 10-15 mm. long. 



Mexico, Pr ingle 4329. 



Mountain meadows. 



7. S. tenuissima Trin. Bull Sc. Acad. St. Petersb. 1 : GT (183G). 

 Culms very slender, GO-80 cm. high. Sheaths sliorter than the 



internodes; ligule 2-4 mm. long; blades scabrid, filiform, involute, 

 about 0.5 mm. diam. even near the base, some of the leaves as high 

 as the culm. Panicle more or less included, very slender, inter- 

 rupted, 15-20 cm. long; rays in threes, fours, or fives, some almost 

 sessile, the largest 4 cm. long. Empty glumes lance-acuminate, 

 with bristle-like points, thin, white, tinged with purple, 3-nerved 

 near the base, first 5-8 mm. long, or the bristle sometimes making 

 it 20 mm. long, second about 5 mm. long; floret scabrid, 2 mm. 

 long, including the abruptly-pointed hairy callus, a short crown of 

 hairs at the apex; awn 7-8 cm. long, 0.2 mm. or less diam., with 

 one bend a third of the distance from the base. 



West Texas, Havard, Buckley; New Mexico, Wright, 1999; 

 Mexico, Pringle 3274. 



Western Texas, New Mexico and Arizona. 



8. S. JaravaBeauv. Agrost. 19 (1812). S. eriostachya H. B. K. 

 Nov. Gen. et Sp. 1 : 127 (1815). >S'. /c/iwKunth, Kev. Gram. 1 : 60 

 (1829). 



A tufted erect perennial. Culms GO-180 cm. higli, nodes 4-5 

 in number. Blades of sterile shoots involute, 40-60 cm. or more 

 long, 0.5-0.7 mm. diam. Sheaths of the culm longer than the 

 internodes (or shorter in tall plants), scabrous; ligule oblique, 

 obtuse, 2 mm. long; blades involute, scabrous on the under side, 

 1-2 mm. diam. Panicle but little exserted, contracted, pale 

 purplish green, 30-40 cm. long; rays in threes and fours, the long- 

 est 10 cm. or more long, branching and bearing numerous sj^ike- 

 lets from a little above the base. Empty glumes subequal, nar- 

 rowly lanceolate, delicate, G-7 mm. long, 3-nerved, the upper 

 sometimes 1-nerved; floral glume linear, 3 mm. long, clothed with 

 short appressed hairs, the apex bearing a tuft of hairs as long as 



