1 78 IVyojuing' Experiment Station. 



Urtica gracilis, Ait. Hort. Kew. iii, 341 (1789). 



Exceedingly abundant in copses on most streams. 



Mexican Mines, July 20, 1894 (No. 590). 

 Parietaria Pennsylvanica, Muhl. Willd Sp. PI. iv, 955 (1805). 



Infrequent; Fairbanks, July 13, 1894 (No. 441). 



CUPULIFER^. 



Betula glandulosa, Mich. Fl. Bor. Am. ii, 180 (1803), 

 On the stony banks of subalpine streams. 



Warm Spring Creek, August 10, 1894 (No. 799). Mountain 

 Birch. 

 Betula occidentalis, Hook. Fl. Bor. Am. ii, 155 (1839). 



Supposedly common on our streams, especially in the northeast, 

 but only collected at Laramie Peak, August 8, 1895 (No. 1647). 

 Western Birch. 

 Alnus incana virescens, Wats. Bot. Cal. ii, 81 (1880). 



Frequent and abundant on our mountain streams, sometimes 

 attaining the size of small trees. 



Big Wind River, August 8, 1894 (No. 728); Cummins, July 29, 

 1895 (No. 1531); also in Centennial Valley. Alder. 

 Quercus undulata, Torr. Ann. Lye. N. Y. ii, 248 (828). 



This is reported abundant in the Black Hills, to which region it 

 is probably confined ; so far as known it is our only Oak. 

 Sundance, July 22, 1891, by B. C. Buffum. 



SALICACE^.* 



Salix arctica petrsea, Anders. 



Infrequent ; not observed by the writer. 



Collected by B. C. Buffum, Bald Mountain, August 15, 1892. 

 Salix alba x fragllis, Wienmer. 



This Hybrid is among those in the City Park, October 1, 1894 

 (No. 1199). 

 Salix amygdaloides, Anders. Ofv. Handl. Vet. Akad. 1858, 114 

 (1858). 



Typical specimens from Snake River, August 21, 1894 (No. 978). 

 My specimens from Big Popo Agie River, August 2, 1894 (No. 738) 



* The Willows wore in large part determined by the late Mr. Bebb ; those collected 

 in iSgs only, by Mr. M. L. Fernald. 



