55 



Sporobolus depaiiperatiis Scribn. (Dropseed). — A small hut valuable grass, form- 

 lug a close, eveu sod of numerous slender leaves and stems; valuable as pasture, 

 but of rare occuri^euce in the desert. South Butte, July 13 (3745) ; Creston, 

 August 29 (4425). 



Calamagrosti-s hyperborea americaiia Kearn. (Sand-grass; Yellow Top). — A tall, 

 slender grass, usually forming an even growth, on wet ground in either open or 

 shaded places. Kara in the desert, 

 occurring only about spring bogs. 

 Black Rock Springs, July 13 (3717). 



Calamagrostis neglecta Gaertn. (Pony- 

 grass). — An erect grass usually 

 found in the margins of ponds and 

 ditches, forming an even growth and 

 bearing an abundance of slender 

 leaves ; a fine appearing and valuable 

 grass. South Butte, July 13 (3750). 



Deschampsia caespitosa Beau v. 

 (Tufted Hair-grass). — A bunch 

 grass with slender stems and numer- 

 ous leaves, common throughout the 

 State, sometimes in comparatively 

 dry ground, but usually along 

 streams and about spring bogs. It 

 furnishes much pasture, but after it 

 matures and dries on the ground it 

 does not seem to be relished by stock. 

 Black Rock Springs, .Inly 13 (3718); 

 Fifteen-mile Springs, July 14 (3727). 



Koeleria cristata Pers. (Prairie June- 

 grass).— A straight, slender grass 

 with cylindrical heads, forming small 

 tufts, 8 to 12 inches high. Common on 

 the plains and in the hills, and form- 

 ing an important part of the early 

 pasture ; far from common in the Red 

 Desert. Creston, August 28 (4417). 



Catabrosa aquatica Beauv. (Water 

 WHORL-(iRASS, fig. 22). — A soft, 

 watery grass, usually with stems 

 partly prostrate and rooting in the 

 soft mud of the sluggish streams and 

 spring-led bogs, where it abounds. 

 Horses and cattle eat it readily and 

 will wade knee-deep in the mud to secure it. South Butte, July 13 (3734). 



Distichlis spicata Greene. (Salt-grass; Alkali-grass). — A stiff, pale, harsh grass, 

 occurring on alkali flats, even where the ground is white with salt. Though far 

 from the best, it is eaten down by stock where other forage is scarce. Black 

 Rock Springs, July 13 (3722). 



Poa buckleyana Nash. (Bunch-grass). — A slender-stemmed, narrow-leafed bunch- 

 grass of much value in this State, but of small significance in the Desert proper. 

 On some of the luoister slopes and draws it becomes of some importance. Green 

 River, June 1 (3067) ; Bitter Creek, June 2 (3100) ; Creston, August 28 (4418). 



Poa juncifolia Scribn. (Alkali Blue-grass, PI. V).— A small, erect bunch-grass 

 with slender, pointed leaves. This new species belongs to the arid region, but 

 it is not confined to the desert exclusively. Usually of scattering growth, it 

 sometimes forms almost a continuous sod. Reported as one of the desirable 



Fig. 22. — "Water Whorl-grass {Catabi-osa aquat- 

 ica) : a, 6, apikelets ; c, d, florets. 



