Apeflflii to List of Species. 



*Arabis Drummondii, Gray, Proc. Am. Acad, vi, 187. 

 On fertile hillsides in the mountains ; not frequent. 

 Union Pass, August 10, ]894 (No. 875); Centennial Hills, June 7, 

 1895 (No. 1248). 

 Arabis hirsuta, (L.) Scop. Fl. Cam. Ed. 2, ii, 30 (1772), 



In sandy valleys, sometimes among the sage brush ; frequent. 

 Laramie Hills, June 7, 1894 (No. 181); Union Pass, August 13^ 

 1894 (No. 1074); Pole Creek, July 1, 1895 (No. 1394). 



Arabis Holboellii, Hornem. Fl. Dan. t. 1879 (1827). 



On a dry, stony sandbar of the Laramie River, Cummins, July 

 30, 1895 (No. 1551). 



Arabis Holboellii Fendleri, Wats. Syn. Fl. i, KU (1895). 



Noted only in the sand beds of the stony foothills of the Laramie 

 range; May 16, 1894 (No. 32). 

 Arabis Lemmoni, Wats. Proc. Am. Acad, xxii, 467 (1887). 

 Among the sage brush on the plains ; infrequent. 

 Laramie, May, 23, 1894 (No. 56). 

 Arabis Lyalli, Watson, Proc. Am. Acad, xi, 122. 



Alpine; Teton Mountains, August 21, 1894 (No. 1007). 

 Arabis Nuttallii, Robinson, Syn. Fl. i, 160 (1895). 

 In valleys but on dry ground. 



Horse Creek, June 9, 1894 (No. 218); Pole Creek, June 28, 1895- 

 (No. 1359). 

 Arabis perfoliata, Lam. Encycl. i. 219 (1788). 



Rare; noted but once; Laramie Peak, August 7, 1895 (No. 

 1628). 

 Thelypodium integrifolium, Endl. in Walp. Rep. i, 172 (1842). 

 \'ery frequent, especially on saline plains. 



Lusk. July 21, 1894 (No. 574); Dubois, August 9, 1894 (No. 

 747); Laramie, August 10, 1895 (No. 1663). 



* Determinations in this genus by Dr. B. L. Robinson. 



