SMITH: STUDIES IN THE GENUS LUPINUS 391 
recognized. This variability paratlels equal diversity in L. 
subvexus and L. densiflorus, as recently shown by me (Bull. Torrey 
Club 45:5. f. 7, 16, 24, 30, 31, 35, and 42). In like manner, varia- 
tions in length of peduncles and details of branching are not 
accepted by me as specific in character unless supported by recog- 
nizable differences in the floral parts or fruits. | This conclusion 
is followed in my treatment of the variable L. Kingii, where these 
variations are evidently superficial rather than fundamental. 
My measurements of the floral parts are from the softened 
material, mounted in water, hence should agree rather with the 
fresh flowers than with dried material. An allowance of about 
10 per cent should be made when measurements of dried flowers 
are compared: with my figures. 
MATERIAL EXAMINED AND CITED | 
Seven institutions have contributed to this paper by making 
it possible for me to examine their specimens of this group. The 
names of these institutions are given below, with the respective 
abbreviations used in the citations. ‘‘CPS” indicates that the 
specimen cited is in the private collection of the writer, and ‘‘FS” 
indicates a specimen owned by the United States Forest Service. 
B, Brooklyn Botanic Garden; 
CAC, Colorado Agricultural College; 
G, Gray Herbarium of Harvard University; 
NY, New York Botanical Garden; 
RM, Rocky Mountain Herbarium, University of Wyoming; 
T, Torrey Herbarium (et New York Botanical Garden) ; 
UC, University of California; 
US, United States National Herbarium. 

Key to the species d varieties of the Pusilli 
Flowers usually crowded into head-like racemes. 
ms short, seldom over 1 cm. long; leaves crowded 
basally; upper calyx-lip not over 2 mm. long, bifid, 
tiednbed or nearly obsolete. 8. L. brevicaulis. 
Stems elongated, several cm. long; ieayes scattered; 
pper calyx-lip 3-6 mm. long, ‘ 
Pubescence copious, that of the pedicels and 
calyx long and spreadin ya. L. Kingii. 
Pubescence scant, that of ie pedicels and calyx ~ 
short and appressed. 4b. var. argillaceus. 
