Rvdberg: Rocky Mountain flora 141 



' Odostemon .Aquif olium (Pursh) Rydb. 



Berberis Aquif olium Pursh, Fl. Am. Sept. 219. 18 14. 

 Berberis repeus Lindl. Bot. Reg. //. 1176. 1828. 

 Berberis nana Greene, Pittonia 3 : 98. 1896. 



^Odostemon nutkanus (DC.) Rydb. 



Mahonia Aquif olium nutkana DC. Syst. 2 : 20. 1821. 

 Berberis Aquif olium Lindl. Bot. Reg. sub pi. 11 yd. 1828. 



v Odostemon nervosus (Pursh) Rydb. 

 Berberis nervosa Pursh, Fl. Am. Sept. 219. 1814. 



a/ Odostemon Fremontii (Torn) Rydb. 



Berberis Fremontii Torr. Bot. Mex. Bound, ^o. 1859. 



* Lepidium crenatum (Greene) Rydb. 



Thely podium crenatum Greene, Pittonia 4 : 20. 1 899. 



The species was described from flowering specimens, but the 

 ovaries or young fruit were developed enough to indicate the true 

 genus. Dr. Greene was probably led astray by the fact that the 

 specimens were labeled Thelypodium intcgrifolium. 



^Erysimum asperrimum (Greene) Rydb. 



V 



133. 1896. 



Erysimum pumilum Rydb. Mem. N. Y. Bot. Gard. I : 189. 1900. 

 In my Flora of Montana I took up Nuttall's E. pumilum for 

 this species. This was evidently an error into which I was led by 

 Dr. Greene's discussion in Pittonia, loc. cit. E. pumilum Nutt. 

 remains as yet unknown, but from the description it must be a 

 close relative of E. nivale and E. radicatum, if not one of these 

 species. * 





Erysimum 



Cluiranthus aridus Greene, Pittonia 4 : 198. 1900. Not C. aridus 



A. Nelson. 1899. 

 Cheiranthus Baked Greene, Pittonia 4 : 235. 1901. 



•Erysimum argillosum (Greene) Rydb. 



Cheii-anthus arp-illosus Greene, Pittonia 3 : 136. 1896. 



