RYDBERG: Rocky MOUNTAN FLORA 141 
Odostemon Aquifolium (Pursh) Rydb. 
Berberis Aquifolium Pursh, Fl. Am. Sept. 219. 1814. 
Berberis repens Lindl. Bot. Reg. pl. 7776. 1828. 
Berberis nana Greene, Pittonia 3: 98. 1896. 
Odostemon nutkanus (DC.) Rydb. 
Mahonia Aquifolium nutkana DC. Syst. 2: 20. 1821. 
Berberis Aquifolium Lindl. Bot. Reg. sub pl. 1776. 1828. 
Odostemon nervosus (Pursh) Rydb. 
Berberts nervosa Pursh, Fl. Am. Sept. 219. 1814. 
Odostemon Fremontii (Torr.) Rydb. 
Berberis Fremontii Torr. Bot. Mex. Bound. 30. 1859. 
Lepidium crenatum (Greene) Rydb. 
Thelypodium crenatum Greene, Pittonia 4: 20. 1899. 
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 7helypodium integrifolium. 
Erysimum asperrimum (Greene) Rydb. 
Cheiranthus asperrimus Greene, Pittonia 3: 133. 1896. 
Erysimum pumilum Rydb. Mem. N. Y. Bot. Gard. 1: 189. 1900. 
In my Flora of Montana I took up Nuttall’s Z. pamilum for 
this species. This was evidently an error into which I was led by 
Dr. Greene’s discussion in Pittonia, Joc. cit. E. pumilum Nutt. 
remains as yet unknown, but from the description it must be a 
close relative of EZ. nivale and E. radicatum, if not one of these 
Species, 
Erysimum Bakeri (Greene) Rydb. 
Cheiranthus aridus Greene, Pittonia 4: 198. 1900. Not C. aridus 
A. Nelson. 1890. 
Cheiranthus Bakeri Greene, Pittonia 4: 235. 1901. 
Erysimum argillosum (Greene) Rydb. 
Cheiranthus argillosus Greene, Pittonia 3: 136. 1896. 
