42 MONTANA AGRICULTURAL COLLEGE SCIENCE STUDIES. 



*Cenchrus tribuloides, L. 

 Columbia Falls, Mrs. J. J. Kennedy. Doubtless introduced. 



Elymus Virginicus submuticus, Hook. (F. L. Scribner). 

 Bozeman, Aug. n, 1898. In low thickets. 



Hordeum caespitosum, Scribn. In wet places, common. 

 Bozeman, Aug. n, 1898; Denton, July 19, 1901, F. A. Spragg. 



Hordeum pusillum, Nutt. 



Forsyth, June 29, 1898; Great Falls, July 9, 1891, R. S. Williams; 

 Billings, June 1898, F. W. Traphagen; Arrow Cr., Meagher Co., 

 July 3, 1901, F. A. Spragg. 



*Panicum nitidum, Lam. Columbia Falls, Mrs. J. J. Kennedy. 

 *Panicum sanguinale, L. "Crab-grass." Sparingly introduced. 

 Bozeman, Sept. 25, 1900. In lawns. 



Panicum virgatum, L. A form found in the extreme 'eastern 

 part of the state differs from the typical eastern form in its small 

 size (3-5 dm.), shorter leaves (10 cm.), shorter panicle (3-12 cm.) 

 and shorter divisions of the panicle, but is probably only a depau- 

 perate form here at its extreme range westward. 



Wibaux, Aug. 15, 1903; Miles City, Aug. 16, 1903. A 

 similar form also in North Dakota. 



*Poa annua, L. In dooryards and waste places, infrequent. 

 Bozeman, 1902; Lake McDonald, Sept. i, 1903; St. Ignatius,. 

 Sept. 7, 1899. 



Poa lepticoma, Bong. (F. L. Scribner). 

 Mystic Lake, July 27, 1898. 



Poa Montanensis, S. & W. (F. L. Scribner). 

 Bozeman, July I, 1898. 



Poa nemoralis glauca, Beal, Grasses of N. Am. 2 : 553. 

 "Montana, Williams." 



Poa Patterson!, Vasey. (F. L. Scribner). 

 Lava Peak, Mystic Lake, Aug. i, 1898. 



*Setaria verticillata, Beauv. Wibaux, Aug. 16, 1903. 



Sitanion rigidum, J. G. S. 



Sqaare Butte, Fergus Co., July 15, 1901, F. A. Spr.igir ; Taylor 

 Peak, Fergus Co., Aug. 13, 1901, F. A. Spragg. 



Trisetum canescens, Buckl. 

 Mountains near Columbia Falls, July 17, 1892, R. S. Williams. 



