82 Wyojuing Experiment Station. 



Lesquerella Ludoviciana, Watson, Proc. Am. Acad, xxiii, 252 (1888). 

 Ve sic aria Ludoviciana, D. C. 



Remarkably abundant on the Laramie Plains, in dry sandy soil. 

 June I, 1894 (No. 190). 

 Lesquerella montana, Watson, 1. c. 251. Vesicaria montana, Gray. 



Very abundant on the sandy, stony foothills of the Laramie 

 range. Table Mountain June 2, 1894 (No. 88); Pole Creek, June 

 30, 1895 (No. 1370). 

 Physaria didymocarpa, Gray, Gen. 111. i. 162 (1848). 



In gravelly clay banks, infrequent, not readily distinguished from 

 Lesquerella until the pods begin to mature. Gros Ventre River, 

 August 16, 1894 (No. 927); Cummins, July 30, 1895 (No. 1555). 

 Draba. (See appendix.) 

 Draba alpina, L. Sp. PI. ii. 642 (i753)- 



Abundant, on stony gravelly ridges on the plains and in the foot- 

 hills. Laramie Hills, May 4, 1894 (No. 4); Laramie River Divide, 

 June 9. 1895 (No. 1223). 

 Draba crassifolia, Graham, Edinb. New Phil. Journ. 182 (1829). 



Infrequent, damp, shaded ground; LaPlata Mines, August 21, 

 1895 (No. 1838). 

 Draba glacialis, Adams, Mem. Soc. Nat. Mosc. v, 106. 



Frequent and of similar habitat as D. alpitia. Maturing fruit 

 early in May. (Nos. 62 and 12 18). 

 Draba stenoloba, Ledeb. Fl. Ross, i, 154 (1841). 



\'ery rare, collected by B. C. Buffum, in a gulch near Bald 

 Mountain, August 15, 1892. 



Sisymbrium canescens, Nutt. Gen. ii, 68. 



As variable as it is frequent in occurrence. Table Mountain, 

 June 30, 1895 (No. 1321); Laramie, June 16, 1894 (No. 247). 

 Sisymbrium incisum, Engelm. Gray PI. Fendl. 8. 



Difficult to separate from some of its varieties. Wheatland, July 

 9, 1894 (No. 475); South Pass, August 31, 1894 (No. 1184). 



Sisymbrium incisum filipes, Gray, PI. Fendl. 8. 



Not at all common; Laramie, August 1893; near Table Moun- 

 tain, June 30, 1895 (Nos. 1349 and 1425)- 

 Sisymbrium incisum Hartwegianum, Wats, Bot. cal. i, 41. 



Observed but once; Sand Creek, August 26, 1894 (No. iioo). 



