134 PITTONIA. 
several, the root no more than biennial; the whole plant 
very rough with uncommonly rigid hairs which, though 
divided as usual, are short and not very closely appressed : 
flowers pale yellow, quite intermediate in size between those 
of C. inconspicuus and C. asper: pods long, slender, ascend- 
ing, in a short raceme. 
That this is the real E. pumilum, Nutt., I have no doubt, 
though it is hardly a dwarf species. Any one familiar both 
with Nuttall’s type-specimens of western plants, and of the 
species as they grow in their native soil, will know that the 
man as a collector was wont to pick up small and pitiably 
unrepresentative specimens of things. And thus the name 
pumilum with him is very commonly misleading. It is to 
be noted that he found the E. pumilum in the same region 
where E. parviflorum, i. e., Cheiranthus inconspicuus, also was 
obtained ; that he published them the one directly after the 
other, and compared them as closely related species. Now 
it is thoroughly well known to me that just these two plants 
and no others of their genus are common on those “ dry 
elevated plains of the Rocky Mountains"! (of Wyoming) to 
which he refers and which he traversed. It is as clear, too, 
that this by no means dwarf, though truly small-flowered 
plant, is wholly distinct from C. asper, and really much 
nearer C. inconspicuus, from which its more obvious harsh 
pubescence, larger flowers, and shorter racemes of longer 
pods are all that distinguish it. 
10. C. rwcoNsPICUUS. Erysimum inconspicuum, MacM. 
Metasp. 268. E. parviflorum, Nutt. in T. & G. Fl. i. 95, not 
ers. Species very well marked not only by its very small 
pale petals, and short suberect pods in a long raceme, but 
also by the green color of the herbage, the peculiar hairs 
universal in the genus being very scanty and scarcely notice- 
able in this plant. Its center of distribution seems to lie 
between southern Wyoming and Montana; and here I have 
E  AUU EM. eT aciei onge essi venne See s 
1 See Torrey & Gray, Fl. i. 95. 
