1898] BRIEFER ARTICLES 275 
THE ROCKY MOUNTAIN SPECIES OF THERMOPSIS. 
(WITH PLATE XVIII) 
Tue difficulty of fitting all my specimens to the accepted descrip- 
tions of the heretofore published species of Thermopsis long since 
led me to suspect that more than two species were represented in this 
gion. Of this I became convinced when perfectly typical material 
ot Thermopsis montana Nutt. was secured in the western part of the 
“atein 1897. The plant, common on the streams near Laramie, 
which T had long supposed to be that, and of which I had not hereto- 
fore secured fruits, turned out, as the fruits show, to be a very different 
one. 
A closer examination of the characters of 7: rhombifolia Rich. 
vals also that some of the specimens that I had unwillingly placed 
“ this name are, instead, a good species. 7: rhombifolia differs from 
Be Bis habitat, mode of branching, its inflorescence, and other 
Characters pointed out in the description. In looking over the recent 
“Seription of 7. rhombifolia in Britton and Brown’s Flora it seemed 
“me probable that the measurements given, especially of the leaves, 
were hardly great enough. 
> *Pécies of this region, as they now appear to be, are T. mon- 
>. . rhombifolia, and the two proposed species. The fruits of these 
four a mttic, a fact shown in the accompanying plate. ee 
Ypical rand . ate all from Wyoming material, are eae 
the size ig ms eg species. They were photographed on one plate, he 
¥, atively correct (about one-third natural size). 
divaricarpa, n. sp.—Erect, 5-8" high: stems several 
nnial root, youngest slightly pubescent especially 
branches nearly simple, bearing only two or three slender yaks 
Ping the as the upper axils, one or two of these generally ica 
lea % ured raceme: leaves large; leaflets ‘sparsely appr . 
heath, rhomboid or narrowly elliptic to oblanceolate, 
* oe oe obtuse, 5—10™ long, 1.5-3-5™ wide, mee ve 
tetile aa ~3™ long ; stipules large, ovate or the uppermost on th 
_Petioles (3- ag Narrower, somewhat inequilateral, lon 
Se ; ale Taceme strictly terminal on the main 
arge, yellow, about twenty; pedicels stout, 
lon 1™ long, 
ger j A 
Pp Salt : calyx large, lobes shorter than the tube, 
the sinus 
