[Vor. 11 
122 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
HYBRIDS 
The many intermediate forms of the section Diplacus found in 
southern California, showing all gradations in color, size, and 
shape of the corolla between the two common species M. longi- 
florus and M. puniceus, suggested that these two species must 
hybridize in nature. In support of this theory, the results óf 
some work done by Dr. Loye Miller: when a graduate student 
at the University of California are of particular interest. Dr. 
Miller crossed a plant of M. longiflorus from near Los Angeles 
with a plant of M. puniceus from near San Diego. With M. 
puniceus as the female parent, the cross was successful; the re- 
ciprocal cross, however, gave no results. In plants of the first 
generation were combined characters of both parents, as would 
be expected. The flowers were salmon-colored with the long- 
tubed large corollas of M. longiflorus and the intermediate type 
of pubescence between the parents. The plants produced little 
pollen so that it was diffieult to get seed from self-pollinated 
flowers. Nevertheless, some were obtained and plants of the Е, 
generation showed red, yellow, and salmon flowers, the salmon 
ones being the most abundant. Specimens were collected from 
these plants which were growing in the botanical gardens at the 
University of California in 1918. These were later comp 
with a large series of plants of intermediate color forms chiefly 
collected by Dr. P. A. Munz, Ivan Johnston, and Robert Har- 
wood, of Pomona College, in the foothills between Los Angeles and 
San Diego. These plants could readily be separated into four 
groups, according to the color, shape, and size of the corolla, the 
length and shape of the calyx, and the presence or absence of 
hairs on the calyx. Members of two of these groups corresponded 
very closely with the specimens of the experimentally produced 
hybrids. In view of this it is probable that further work would 
yield plants corresponding to the other groups. Typical М. lon- 
giflorus is found from Santa Barbara Co. to southern Los 
Angeles Со., rarely as far as Lower California. From Los 
Angeles Co. southward, it extends into the district where M. 
The interesting results of the experimental study outlined above were sent # | 
the writer by Dr. Miller. They have not been previously published because 
work was not completed. 
