SMITH: STUDIES IN THE GENUS LUPINUS 171 
Monterey for the north. Mature seed, however, might have been 
taken by him almost anywhere from Santa Barbara to Sonoma 
County. The ‘type’ of Agardh’s L. Menziesii probably came 
from San Luis Obispo County, while the ‘“‘type’’ of L. densiflorus 
Agardh almost certainly came from the vicinity of Monterey. 
L. densiflorus Benth., however, was based upon specimens grown 
from seed collected by Douglas. The seed characters given by 
both Bentham and Lindley ought to be useful; but, unfortunately, 
the seeds of most of the varieties herein recognized are unknown, 
and none of those seen help much in the study from this angle. 
Therefore, what may be accepted as reliable diagnostic seed char- 
acters are yet to be worked out. 
To sum up:—It seems to be an easy matter to establish the 
identity of L. densiflorus Benth., when such is recognized as a 
composite of numerous variable forms; but it is certainly a much 
more difficult matter to determine which of the several forms is 
properly to be designated as the typical plant. None of the vari- 
eties herein considered are known to combine a low stem six or 
seven inches high with pink-veined white petals and seeds smooth, 
olive-green, and minutely dotted with black. For the present, 
however, to serve as the typical form of the species, I am accepting 
a Sonoma County plant whose inflorescence, flower-color, and 
pubescence agree fairly well with Bentham’s description and the 
plate in the Botanical Register, and whose period of blossoming 
at Santa Rosa, June 2, as found by Heller, would have permitted 
the collecting of seed by Douglas at the time of his visit to that 
region. ; 
The following key will probably be useful in determining most 
of the material in the larger herbaria in terms of tHe varieties 
recognized in this paper. Undoubtedly additional varieties are 
yet to be added to the list. 
Key to the varieties of Lupinus densifiorus 
Calyx not bushy-villous below, the hairs 0.3-1.5 mm. long, 
: bracteoles Sequenty. present. 
Pub lly | less than I mm. 
oe rather dense ‘and subappressed or 
ppressed; lower calyx-lip aie sles 
Beier and bent near base. DENSIFLORI. 
Leaflets thin or thickish, not blackening in drying. 
