136 LEAFLETS. 
In between the habitat of this and that of S. affinis are bar- 
riers of high mountain and low desert in untold number ; and 
other well differentiated species of this genus will be found in 
that significant and varied interval. 
S. crssopEs. Dwarf, with tortuous or even reclining branches 
glabrous and of a light ash-gray, the growing twigs almost fili- 
form, puberulent : foliage small, ivy-green, veiny and glabrous 
above, paler beneath aud appressed-pubescent along the veins 
only, the leaves all simple, often deeply trisected in imitation 
of the trifoliolate, even occasionally divided to the midvein ; 
terminal segment broader than long, incisely 3-lobed, the margin 
angular-toothed; lateral lobes about half as large, not lobed but 
coarsely dentate. 
Grand Cañon of the Colorado, Ariz., near Indian Garden, 
Bright Angel Trail, C. H. Merriam, 10 May, 1903. Elegant 
vine-like species, and a nice link between the usual trifoliolate 
type, and that with rounded and simple leaf. 
S. ANISOPHYLLA. Dwarf, stout rigid short-branched desert 
shrub; twigs for two seasons puberulent, afterwards gray, 
glabrate : foliage at least half-grown at flowering time, small, 
distinctly trifoliolate but lateral leaflets small and degenerate, 
never equal to each other in size, the largest not half the size of 
the terminal, this obovate-cuneiform, lightly 3-lobed and obtusely 
so: small round capitiform spikes many; bracts transverse- 
rugose in the middle, only minutely and obscurely ciliolate. 
Surprise Cañon, Panamint Mountains, southeastern Calif. 
A. K. Fisher in Death Valley Exp. n. 618 asin U. S. Herb. A 
still earlier link in the connection between trifoliolate and sim- 
ple-leaved species. 
S. ELEGANTULA. Slender and tortuous or reclining like 
S. cissodes, only the growing twigs puberulent, also the foliage 
half-grown at flowering time: leaflets 3 and subequal, all incisely 
lobed, the terminal one doubly so: spikes 1 or 2 at the end of 
each slender branch, capitiform, broader than long; bracts 
tomentulose. 
Flagstaff, Arizona, May, 1893, N. C. Wilson, as in my herba- 
rium, 
