37 



Calamagrostis purpiirascens R. Br. (Puri'LIsii Reed-grass, fig. 10). — A mountain 

 form, 12 to I'U inches high, with amjjle root-leaves and close cylindrical heads. 

 The specimens secured formed close hunches on the rocky clitfs and on the 

 highest summits; not abundant. Battle Lake, August 16 (4047 and 4056). 



Calamagrostis scribneri Beal CScribxer's Reed-grass). — Erect and stout, with a 

 wealth of long broad leaves and ample heads 3 to 4 feet high; the handsomest 

 grass of the genus, often making a dense close growth that yields an abundance 

 of hay, presumably excellent, though the leaves are somewhat scabrous to the 

 touch. It jtrefers wet ground, but thrives on the bottom lands anywhere or even 

 on the lower slopes of the adjacent hills. Johnsons Ranch, August 9 (3920) ; 

 Woods Creek, August 10 (3954) ; Grand Encampment Creek, August 13 (3989) ; 

 ^ledicine Bow River, August 20 (4082). 



Calamovilfa longifolia Scribn. (Big Sand-grass). — A coarse grass occurring in 

 occasional clumps, 2 to 4 feet high. Rare in this range and probably confined 

 to the eastern part of the State, where 

 it occurs on the dry sandy plans or hill- 

 sides. Hillsdale, .July 7 (3G(J6j. 



Deschampsiacaespitosa Beauv. (Tufted 

 Hair-grass). — Uensely tufted, with an 

 abundance of long root leaves, the slen- 

 der stems exceeding the leaves and ter- 

 minating in large, loose, spreading 

 panicles. It is of frequent occurrence 

 throughout this entirf range, occurring 

 on all the streams, in the mountains on 

 all the moist slopes, and even on alpine 

 summits. Little Laramie River, July 4 

 (3337); Pine Bluffs, July (5 (3623); Bea- 

 ver Basin, July 22 (3817); Evanston, 

 July 28 (3860) ; Grang.-r, July 30 (3890) ; 

 Woods Landing, August 7 (3904) ; Battle 

 Lake, August 16 (4008). 



Tri.setum subspicatum Beauv. (Downy 

 Oat-grass). — Usually growing in small 

 tufts, which are irregularly scattered 

 on mountain slopes or more rarely in the 

 valleys, root-leaves abundant, the up- 

 per stem nearly naked and bearing a 

 short, cylindrical head, with soft, di- 

 vergent awns. As a pasture grass it 

 has value in proportion to its abun- 

 dance. Battle Lake Mountain, August 

 17 (4045 and 4061). 



Danthouia californica Boland. (Cali- 

 FORXiAX Oat-(;rass). — Decumbent at 

 base and somewhat spreading or de- 

 clined in habit, stems leafy, 20 to 30 inches high; panicle small. It is certainly 

 very rare in the region, for which reason its forage value need not be taken into 

 account. Observed but once as a scattering growth in an aspen grove in a moist 

 valley. Greentop, June 29 (3253). 



Danthonia intermedia Vasey (Mountain Oat-grass). — An erect, handsome grass 

 with well-developed heads, 15 to 25 inches high. It occurs in small patches as 

 an open sod in the margins of the woods or in the small parks in the mountains. 

 In many x)laces it is sufficiently abundant to have much value as a pasture grass. 

 Battle Lake, August 17 (4037 and 4055) ; Woods Creek, August 9 (39.59). 



Danthouia parryi Scribn. (Parry's Oat-grass). — Somewhat similar to the preced- 

 ing, but lower and with looser heads, more inclined to be tufted at base. This 



Fig. 8. — tSporobolus con/usus : a, b, c, npikelets; 

 d, floret. 



