390 SmitH: STUDIES IN THE GENUS LUPINUS 
carpi, but so placed it on the basis of its verticillate inflorescence. 
The non-ciliate keel and the floral bracts, however, connect it 
with the Pusilli. To contrast it further with ZL. subvexus trans- 
montanus C. P. Smith (Bull. Torrey Club 45: f. zo), with which it 
is confused, I insert here drawings of my own, FIG. 43. I now con- 
sider. it better to compromise the situation by recognizing three 
divisions of the subgenus, and accordingly propose the following 
classification : 
Flowers not verticillate; keel glabrous. PUSILLI. 
Flowers, at least the lower, in whorls. 
Keel glabrous; flowers 10-12 mm. long. MALACOPHYLLI. 
Keel ciliate above near claw; flowers 11-19 mm. long. MICROCARPI 
GEOGRAPHICAL DISTRIBUTION 
The Pusillt are peculiar to western North America. Typical 
L. pusillus is primarily a species of the Atlantic drainage of the 
Rockies, from Alberta and North Dakota to western Kansas 
LO8 


Fic. 43.. LuPINUS MALACOPHYLLUS Greene. A. A. Heller 9606 (CPS). 
and New Mexico. All the other forms of the group, however, are 
plants of the Great Basin and Mexican Plateau, from central 
Washington and southwestern Wyoming to Arizona and southern 
California. 
DIAGNOSTIC CHARACTERS 
Authors’ ‘original descriptions’? are not reprinted in this 
paper. The diagnoses here presented have no pretense of being 
complete, but are intended to sum up briefly the seemingly more 
dependable characters. These descriptions, therefore, allow for 
the evident variations observed by me in the specimens listed. 
The upper calyx-lip calls for special mention. While this — 
seems to be relatively constant in size and shape in most of the 
forms of this group, its variability in L. brevicaulis should be duly 
