283 Rydberg : Studies on the Rocky Mountain Flora 



the fertile flowers have very minute petals or none and the follicles 

 have long beaks. In all systematic botanies of Scandinavia 

 and Russia, S. rosciiui is described as having yellow petals, which 

 is never the case in the Rocky Mountain and Alaskan plants. 

 In this respect plants from eastern North America agree with the 

 European. 



S. frigidtnn is an alpine-arctic plant growing in Colorado at an 

 altitude of 3000 m. or more. In Montana it is found at an alti- 

 tude of about 2700 m. and in Alaska at low altitudes. It grows 

 among rocks, associating with several species of Saxifraga and 

 Adoxa Moschatellina. 



Montana: Old Hollow Top, 1897, Rydbcrg & Bcssey, 42^8 

 (type); Long Baldy, 1896, Flodman, jij ; Haystack Peak, 1899, 

 P. Koch. 



Colorado : West Spanish Peak, 1900, Rydberg & Vreeland, 

 61 12 (9); 61 14 ( (? ) and 61 ij (.with greenish, merely purple- 

 tinged flowers) ; Grayback Mining Camp, 61 16 ; Pikes Peak, 

 1900, F. Clnneiits ; 1821, Dr. James ; Arapahoe Peak, 1891, Dr. 

 E. Penard ; Pikes Peak, 1894, E. A. Bcssey ; 1893, De Alton 

 Saimdcrs. 



Nevada: Mineral King, Sierra, Nev^ada, 1891, Covillc & 

 Fiinstoii, ij2(p. 



Idaho: Packsaddle Peak, 1892, Sa/idbcrg, MacDougal & 

 Heller, 860. 



Washington: Mt. Paddo, 1886, W. H. Suksdorf, 839. 



Alaska: Muniak Island, \%<^\, Jas. M. Macoiin, 48; Shu- 

 magin, 1 871-1872, J/. W. Harrington; King Island, 1897, E. 

 A. Mcllhenny, 8j. 



Sedum polygamum sp. nov. 

 Perennial with a thick fleshy rootstock. Stem 1—3 dm. high : 

 leaves obovate or oblanceolate, acute, sessile, flat, entire or minutely 

 denticulate, 1.5—2.5 cm. long: inflorescence dark purple, dense : 

 flowers dioecio-polygamous : sepals of the staminate ones lanceo- 

 late, 2 mm. long, acute : petals oblanceolate, dark purple, about 3 

 mm. long : filaments about half longer than the petals, purple, 

 broader than in the preceding species, abruptly acuminate above : 

 fertile flowers with more lanceolate petals and usually with sta- 

 mens which however have shorter filaments scarcely exceeding 

 the petals : follicles 6-8 mm. long with an ascending or spreading 

 beak, about i mm. long. 



