8 University of Califcnild I'lihlirdlidiis in liolaiin [Vol. < 



the Sierras at altitudes of from 3000 to 4500 feet. On :\rount St. 

 Helena, however, a ])eeiiliarly deep garnet-petalled form is reported 

 and it is very desirable that field studies be made at tlie head of 

 Napa Valley on 1lie line along which 1h<' 1\vo eolor types come into 

 contact. A distinelly wliile-petalled form is characteristic of Wash- 

 ington, Oregon and of nortliern California, and Napa Valley appears 

 to represent the southern limit of its range. In the main all the 

 northern white-petalled plants correspond to those in Napa Valley 

 in showing no pigmentation of flower i)ai'ts, although many plants 

 from southern Mendocino County with pure white petals show 

 evident traces of deep red pigmentation on the stamens and pistil. 

 Isolated individuals which bear flowers entirely colorless have at times 

 been found south of Napa Valley, but they seem best considered as 

 representing a stage in the transition from undeveloped to normal 

 flower which will be discussed in the next paper of this series. 



The second distinct color form is one involving variation abont 

 a greenish*yellow shade of petal color and is found in the outer 

 Coast Range from Sonoma County south to Monterey County. Plants 

 with green, greenish-yellow, dull orange or reddish-brown petals were 

 first found on Point Reyes peninsula, which is perhaps the northern 

 limit of this color form. It is found predominating in eaiions at 

 the base and south of Mount Tamalpais in Marin County and at a 

 number of stations in Santa Cruz County. Within this color form 

 there is a striking absence of white or very light green petalled in- 

 dividuals, though deep garnet flowers are not infrequently found. 

 Among the lighter-colored flowers of this form a brilliant viridine 

 yellow is not an uncommon shade, while in the green-flowered forms 

 the leaves, sepals and petals are indistinguishable so far as eolor is 

 concerned. In plate 2, figure 3, flowers of Marin County representative 

 of this second color form are shown. The extremes w^ere included for 

 comparison and no attempt was made to indicate the predominance 

 of the lighter color shades. Plate 2, figure 4, from a photograph of 

 dried specimens and included to exhibit size variation, indicates 

 nothing as to the range of color forms to be found in the third eolor 

 form described below and to which the original plants belonged. 

 Throughout the range of variation in coloi- of this second form, the 

 stamens and i)istils uniformly show a greater or lesser amount of 

 pigmentation. 



The third color form is in general peculiar to caiion.s of the hills 

 sui-rounding San Fi-ancisco P)ay on the east and southwest — i.e., 



