MEINIOIRS OF THE NEW YORK BOTANICAL GARDEN. 29 



are prostrate, only the upper portion of the flower-bearing ones becom- 

 ing erect and seldom i dm. high. S. hrcvifoUus is rarely much 

 tufted, the stems often i-^ dm. high and mostly erect. S. defaiipcr- 

 atiis grows in poor soil to an altitude of 2000 m. 



Montana: Logan, 1895, Shear, j 16 : Butte, Rydhcrg, 22gy. 



*Sporobolus filiformis (Thurber) Rydb. Cont. U. S. Nat. Herb. 



3: 189; \ilfa depaiipcrata fJifonuis Thurb. ; Wats. Bot. King's 



Exp. 5: 376; Vilfa o-racillinia Thurber, Bot. Cal. 2: 268. 



Distinguished from the preceding by the annual root, the small size, 

 the fewer-flowered panicle and the smaller flowers. On sandy shores 

 at an altitude of 2300 m. 



Yellowstone Park: Shoshone Lake, Aug. 10, 1897, Rydhcrg 

 d' BcsscY, j6Si ; Upper Falls of Yellowstone, 1871, Hayden, 5. 



Sporobolus confusus Vasey, Bull. Torr. Bot. Club, i : 293 ; Cont. 



U. S. Nat. Herb. 3 : 64 ; Sporobolus ramulosus Thurber, Bot. 



Cal. 2 : 269 [Man. R. M. 411] ; not Vilfa ramiilosa H.B.K. 



This is a rather rare grass, growing in sandy soil, at an altitude of 

 1500-2000 m. 



Montana: Logan, 1895, Shear, joi ; Rydberg, 2264; Melrose, 



22gT . 



Sporobolus asperifolius Nees & Meyen, Nov. Act. Nat. Cur. 19: 



Suppl. I, 141 [Man. R. M. 412 ; 111. Fl. i : 156]. 



In meadow land, especially in sandy ground, up to an altitude of 

 2000 m. 



Montana: Townsend, 1S95, Shear, 705; Rydberg, 2iyo; Lo- 

 gan, Shear, J26; Gallatin, 5?/ ; Melrose, jj4; Jack Creek, July 

 19, 1897, Rydberg ct Bessey, JjSj; 1883, Scribner, jj2; Great 

 Falls, 1886, R. S. Williams, 337; East Gallatin, 1896, Rydberg, 

 3ig2: Musselshell River, 3438; Missouri River, 1883, Scribner, 

 332; Snowy Mountains, 1882, Canby: Billings, 1898, Williams & 

 Griffith. 



Yellowstone Park: Hot Sulphur Springs, iS"]!, Haydoi. 



Sporobolus airoides Torr. Pac. R. R. Rep. 7: part 3, 21 [Man. R. 



AL 411; 111. Fl. i: 155] ; Agrostis airoides Torr. Ann. Lye. 



N. Y. i: 151. 



It grows in dense and hard bunches on dry prairies and plains, ex- 

 tending in the valleys up to an altitude of 2000 m. 



