170 ERYTHEA. 



S. Sierrx, which is perhaps its nearest ally, in its leaves, except 

 that they are not "conspicuously serrate-denticulate." The petals, 

 when present, differ from both those of ;S'. Sierroa and of S. integ- 

 rifolia in not exceeding the calyx lobes. They are not retuse, as 

 in the former, nor clawed, as noted by Mr. Howell in his descrip- 

 tion of S. Oregana. There seems to be no mention anywhere of 

 anything like the peculiar carpological character noted above, ex- 

 cept in S. plantaginea, whose fruits will no doubt be found sinjilar 

 to those of the species here described. 



S. integrifolia and its related species are nearly all from the 

 Pacific Coast states, while this species is of the Rocky Mountains, 

 appearing to be quite common in northwestern Wyoming. 



The following are the chief collections: No. 5490, Henry Lake, 

 eastern Idaho, June 22,1899; No. 6089 (type). Obsidian Creek, 

 July 24; No. 5580, Glen Creek, June 30; No. 6687, Dunraven 

 Peak, Aug. 27; the last three numbers all from Yellowstone 

 National Park, 1899. 



University of Wyoming, 



Laramie, Wyo. 



