1 34 Wyoming Experiment Station. 



Helianthus giganteus, L. Sp. PI. 905 (1753). 



Near streams and in wet bottoms; not frequent. 



Muskrat Creek, July 30, ISOi (No. 684); Laramie, October 6, 

 1894 (No. 1169). 

 Helianthus Nuttallii, T. & G. Fl. N. A. ii, 324 (1842). 



Secured only west of the Wind River Mountains. 



Gros Ventre River, August 16, 1894 (No. 1083). 



Helianthus pumilus, Nutt. Trans. Am. Phil. Soc. vii, 366. 

 Frequent on dry slopes and hilltops. 



Platte River Hills, July 14, 1894 (No. 501); also from Casper. 

 Helianthus rigidus, Desf. Cat. Hort. Paris. Ed. 3, 184 (1813). 



Whalen Canon, July 18, 1894 (No. 528); Laramie Peak, August 

 6, 1895 (No. 1578). 

 Helianthella quinquenervis, Gray, Proc. Am, Acad, xix, 10. 

 In the mountains, in open places near streams. 

 Bald Mountain, by B. C. Buffum ; Union Pass, August 10, 1894 

 (No. 803); Laramie Peak, August 6, 1895 (No. 1654). 

 Thelesperma gracile, Gray, Kew. Journ. Bot. i, 252 (1849). 

 Frequent on the hills near the Platte Riiver. 



Near Fort Laramie by B. C. Buffum ; Blue Grass Hills, July 8, 

 1894 (No. 321). 

 Bidens frondosa, L. Sp. PI. 832 (1753). 



Frequent in the eastern part of the state. 



Wheatland, September 1892 ; Sheridan Experiment Farm, Sep- 

 tember 1895, J. F. Lewis. 

 Bidens cernua, L. Sp. PI. 832 (1753). 



In wet places about Wheatland, September 1892, B. C. Bufium. 

 Madia glomerata, Hook. Fl. ii, 24. 



A rare plant ; in dry rich loam soil. 



Big Wind River, August 2, 1892, B. C. Buffum ; Laramie Peak, 

 August 8, 1895 (No. 1593). 

 Chsenactis Douglasii, Hook. & Am. Bot. Beechy. 354 (1840-41). 

 On abrupt stony clay hills. 



Mouth of Bacon Creek, August 15, 1894 (No. 909); Cummins, 

 July 25, 1895 (No. 1439). 



Chsenactis Douglasii alpina, Gray, Syn. Fl. 341 (1884). 



On subalpine stony hilltops ; easily distinguished from the 

 species by its striking rosette of radical leaves and its smaller size. 



