AQROSTIDE^. 341 



enxia Suksdorfii Scribn. Vasey, Desc. Cat, Gr. IT. S. 51 

 (1885). 



A slender tufted perennial, 60-90 cm. liigli. Shcatlis shorter 

 than the internodes; ligule 3-5 mm. long, often more or less 

 Avooll y pubescent on the back near the base of blade ; blades of sterile 

 shoots 15-30 cm. long, 3-5 mm. broad, tapering into very long and 

 slender points, scabrous below and strigose pubescent above; those 

 of the culm usually three. Panicle pale straw-color, strict, more 

 or less interrupted, 8-10 cm. long, 1.5-2 cm. wide; rays in crowded 

 clusters, 2-3 cm. distant, the longest 4 cm. long, all densely 

 flowered. Spikelets 3-4 mm. long, empty glumes subequal, lan- 

 ceolate, acute, first 1-nerved, second 3-nerved at the base; floral 

 glume oblong, truncate-toothed, 2.7 mm. long, the stout twisted 

 awn starting below the middle and extending 1-2 mm. above its 

 glume, hairs less than 1 mm. long, in two bunches near the mar- 

 gins of the base of the glume ; palea as long as its glume, rudiment 

 1 mm. long, with hairs making it appear still longer. 



In the Montana plants, the woolly pubescence at the base of the 

 blade is wanting. 



Montana (Great Falls), Anderson 54: British Columbia, Macoun 

 in 1885; Oregon. (7?mc^ 1317. 



Montana, British America, Washington, Oregon, and California. 



6. C. rubescens Buckl. Proc. Phila. Acad. 92 (1863). Deyeuxia 

 rubescens Vasey, Cat, Gr. U. S. 51 (1885). 



A slender erect tufted perennial, more or less purple throughout, 

 60-90 cm. high, from strong rootstocks. Sheaths half as long as 

 the internodes; ligule acute, lacerate, decurrent, 3-5 mm. long; 

 blades of sterile shoots numerous, involute, setaceous, glaucous, sca- 

 brous, 10-20 cm. long, 3 mm. wide, those of the culm 3-4 in num- 

 ber, 10-15 cm. long, the upper one 4 cm. long, short woolly hairs 

 usually appearing on the lower side at the base of the blade. Pani- 

 cle much exserted, strict, dense, interrupted, 7-10 cm. long, 1.5 

 cm. broad, the short rays densely flowered to the base. Spikelets 

 rough, elliptical, acute, nearly 4 mm. long; empty glumes equal 

 or slightly unequal, ovate-lanceolate, first 1-nerved, second 3- 

 nerved; floral glume a little shorter, narrowly elliptical, acute, bifid. 



