57 



p. A. Rydberg 2342); Montpelier (T. A. Williams 2558). Wjioming: Bear Tooth 



Mountains (W. H. Forwood); Bear Lodge Mountains (T. A. Williams 2619); 



Jacksons Lake (W. H. Forwood); Elk Mountain (A. Nelson 4098); Buffalo Fork 



(F. Tweedy 65) ; Rife's Ranch (A. Nelson 3759, 3827) ; Seminole Mountains (A. 



Nelson 4921) ; Sierra Madre Mountains (A. Nelson 4035). Montana: Lima (C. L. 



Shear 560^) . Oregon : Powder River Mountains (C. V. Piper 2529). 

 The above species is very closely related to B. marginatus, into which it passes and of 



which it should perhaps be regarded as a variety. It differs chiefly from the 



typical form of B. niar- 



ginatus in being smooth- 

 er throughout. 

 32a. BROMTJS POLY- 

 ANTHUS PANICTJ- 



LATUS n. var. (Fig. 



35.) 

 A rather tall, leafy plant 



with a larger, laxer, 



more spreading j>anicle 



than the species and 



having the upper part 



somewhat nodding. 



The leaves are rather 



broader and the spike- 

 lets slightly narrower, 



with the florets rather 



looser in flower and the 



awn sometimes reach- 

 ing 7 mm. long. 

 Type No. 333 Tracy, Earle, 



and Baker, collected in 



West Mancos Canyon, 



Colorado, altitndeabout 



3,000 meters. 

 Specimens examined. — Col- 

 orado : West Mancos 



Canyon (Baker, Earle 



and Tracy 333); Trim- 

 ble Springs (Baker, 



Earle & Tracy 4301); 



Parrott (Baker, Flarle 



& Tracy 4297) ; Buffalo 



Pass (Shear & Bessey 



1493); Sheep Horn Di- Fig. S^.—Bromvn alentensis: a, empty glumes with two florets; 



vide (Shear & Bessey ''■ '^"^sal view of a flowering glume. 



1552) ; La Veta (C. L. 



Shear 812). Utah: Gunnison (L. F. Ward 286). Arizona: Straw1)erry Creek 



(D. T. McDougal 707). 

 This plant bears the same relation to the species that B. margina.tH.<i latior does to its 



species. Its distribution is more southern in general and most frequent in lower 



altitudes. 

 33. BROMUS ALEUTENSIS Trin. Griseb. in Ledeb. Flor. Ross. 4 : 361. 1853. 



(Fig. 35.) 

 A rather tall, stout perennial, with a lax, suherect panicle and broad, linear-lanceolate 



leaves. Culms 5-10 dm. high, erect, stout, usually slightly pubescent just below 



