92 Wyoming Experiment Station. 



i6, 1894 (No. 557); noted also at Laramie Peak, growing in pro- 

 fusion in a rocky canon. Poison Ivy. 

 Rhus trilobata, Nutt. T. & G. Fl. i, 219 (1838). 



A low, spreading shrub, frequently almost covering both sides 

 and summits of the low rounded hills in the Laramie range. Table 

 Mountain, June 2, 1894 (No. 159); Blue Grass Hills, July 8, .1894 

 (No. 322); Laramie Peak, August 7, 1895 (No. 1477). 



LEGUMINOS^. 



Thermopsis montana, Nutt. T. & G. Fl. i, 388 (1838). 



Not common, occurring on sandy creek banks, Laramie River^ 

 fl. June 15, fr. August 19, 1891, B. C. Buffum. 



Thermopsis rhombifolia, Richards. App. Frank. Journ. 13 (1823). 



Abundant in sandy ravines and valleys in the hills, the great 

 patches of yellow standing out in sharp contrast to the green grass, 

 and white rocks. Table Mountain, June 2, 1894 (No. 122); Lara- 

 mie Hills, June 5, 1895 (No. 1240). 



Lupinus argenteus, Pursh, Fl. 468 (18 14). 



A widely distributed and common species of this well represented 

 and beautiful genus. Apparently at higher altitudes than the var. 

 following. Chugwater Creek. July 7, 1894 (No. 301); Meadow 

 Creek, August 9, 1894 (No. 972); Laramie Peak, August 7, 1895 

 (No. 1584). 



Lupinus argenteus decumbens, Wats. Proc. Am. Acad, xviii, 532 



(1873). 



On creek banks in the hills and plains. Pole Creek, June 2» 



1894 (No. 104). 

 Lupinus aridus, Dougl. Lindl. Bot. Reg. xv, 1242 (1829). 



On the plains of the Sweetwater River, by Geo. M. Cordiner^ 

 September 6, 1894 (No. 1206). 

 Lupinus caespitosus, Nutt. T. & G. Fl. i, 379. 



A delicate httle plant almost alpine in its habitat; observed but 

 once; Union Peak, August 13, 1894 (No. 996). 

 Lupinus laxiflorus, Dougl. Lindl. Bot. Reg. xiv, 1140 (1828). 



Frequent and sometimes covering great stretches of the sandy 

 plain with its characteristic color. Blue Grass Creek, July 8, 1894 

 (No. 360); Lusk, July 21, 1894 (No. 584); also west slope of Wind 

 River Mountains, August 14, 1894. 



