652 POACE.E. 



mm. long, empty glumes subulate, 12-15 mm. long, 0.5-0.7 mm. 

 wide; floral glume firm, obscurely 5-nerved, 8-13 mm. long, the 

 short teeth unequal, awn about 2 mm. long; palea as long as its 

 glume. Grain about 7 mm. long. 



Type specimen, Colorado (Pen Gulch), Vasey in 1884; also 

 collected in Montana by Anderson in 1889. 



8. E. elymoides (Kafin.) Sweezy, Cat. Neb. PI. 15 (1891).. 

 ^^gilojjs hystrix Nutt. Gen. 1 : 86 (1818). Sitanion elymoides 

 Kafin. Jour. Phys. 89:103 (1819). E. Sitanion R. & S. Mant.. 

 2 :426 (1824). 



Culms tufted, 10-60 cm. high. Leaves glabrous, scabrous, or 

 hirsute ; sheaths of the culm 3-4 in number, longer than the inter- 

 nodes, the upper inflated; ligule a mere line; blades mostly fiat, the 

 apex setaceously pungent, the upper one 2-5 cm. long, 2-3 mm. 

 wide. Spikes included at the base or on short pedicels, 5-15 cm. 

 long, easily breaking into pieces. Spikelets 2, sometimes 3, at each 

 joint of the rachis, 2-4-fiowered; empty glumes single, or some or 

 all of them unequally divided to the base, extending insensibly into 

 stiff diverging awns 4-9 cm. long; floral glume 7-10 mm. long, sca- 

 brous, 5-nerved above, bearing an awn as'long as those of the empty 

 glumes, often with a short awn on either side of the apex; palea 

 entire, emarginate or bearing 2 short bristles. 



A very variable grass, concerning a collection of which General 

 Munro, as quoted by Dr. Thurber in S. Wats. Bot. Calif., said: 

 "A valuable series, showing how many species and even genera 

 might be made out of this one." 



Colorado, Jones 531, Patterson 153, Letterman 88; Montana, 

 Anderson 32, Williams; Arizona, Rushy, Tourney 795, 797; Wash- 

 ington, Howell; California, Pringle, Orcutt. 



Rocky Mountains to Texas, California, and Mexico. 



9. E. Saundersii Vasey, Bull. Torr. Club, 11: 126 (1884). 

 This is closely related to E. elemoides, of which it is perhaps 



only a variety. The leaves are a little longer, spikelets often only 

 one at a joint of the spike, empty glumes narrowly elliptical, with 

 a shorter av/n, unequally divided at the apex. 

 Colorado, Vasey. 



