Rydberg: Studies on the Rocky Mountain Flora 284 



This species is closely related to the preceding, but is stouter, 

 the fertile flowers usually with stamens, the follicles larger and 

 with less divaricate beaks. It has also been included in 5. rosciim^ 

 but is really nearer related to S. atroptirpiircujn of eastern Asia, 

 which however has larger leaves. .S. polygamuin grows at an alti- 

 tude of 3000 m. or more. 



Colorado : West Spanish Peak, igoo, Rydberg & Vrecland, 

 61 1 J (type); Silverton, 1895, F. Tzvccdy 124.; Mt. Hesperus, 

 1898, Baker, Earle & Tracy, 481 ; Basin Creek, La Plata Moun- 

 tains, 4.80 ; Mt. Lincoln, 1873, /. M. Coulter; Chambers Lake, 

 1894, C. S. Grand all. 



New Mexico: White Mountains, 1897, E. 0. Wootou, djy. 



