2 SMITH: STUDIES IN THE GENUS LUPINUS 
L. Bridgesui Gray is evidently the same as L. luteolus Kell. and 
is so acknowledged by Watson (Bib. Index 238). L. arenicola has 
been referred by Heller (Muhlenbergia 6: 70) to L. lacteus Kell., 
which, as noted by Heller, was referred by Watson first to L. 
densiflorus and later to L. microcarpus. L. malacophyllus Greene 
might easily be considered as a connecting link between the 
Pusilli and the Microcarpi. Since so many variations occur, it 
is really surprising that no more names have been published. 
Several specimens have been marked “var.” by the collector or 
student; but evidently no one has cared to attempt a critical study 
of the group. Except for the material easily determined as L. 
luteolus Kell., most specimens have been labeled either L. micro- 
carpus or L. densiflorus, or left unnamed. - 
During four years of field observations in middle western 
California, my efforts to determine the variations I collected led 
to unsatisfactory results, and a survey of the material found in the 
herbaria visited in 1908 brought me to the determination to some 
day seek a classification that might possibly eliminate some of the 
evident confusion as to proper identifications. With this object 
in mind, I recently undertook to look into the status of the forms 
already described, and then to work out the relationships and char- 
acters of the seemingly undescribed forms known to me. 
MATERIAL EXAMINED 
The National, Stanford University, and University of Cali- 
fornia herbaria kindly placed many sheets in my hands for study. 
Two weeks were spent in Cambridge, New York, and Philadelphia, 
where the material in the herbaria in those cities was given due 
attention. Thus some 225 sheets have been considered in forming 
the opinions put forth in this paper. 
GEOGRAPHICAL DISTRIBUTION 
This group is peculiar to the west coast of America, the range 
generally ascribed to the initial species, L. microcarpus Sims, being 
the range of the entire group. In South America, the plants seem 
to be confined to central Chile, having an altitudinal distribution 
from the coast far up into the Andes. In North America the 
longitudinal range is from Vancouver Island to Lower California; 
