[Vor. 4 
50 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
tion. Through the kindness of Dr. T. H. Goodspeed I was 
able to examine some histological preparations of the young 
buds of Т. giganteum and Т. ovatum. From such examination 
as I was able to make I could detect no difference between the 
two species either in chromosome number or in size of cells. 
It therefore appears probable that the gigantism of Т. gigan- 
teum is a result of increased growth and multiplication of 
cells rather than increase in the size of the cell unit. I speak 
guardedly, however, because my comparison was hasty and 
incomplete. 
T. giganteum is characterized by its stout stem, large, 
round-ovate leaves frequently as broad as long, reaching a 
length (in specimens observed) of 16 cm. and a width of 
12-16 em. The petals typically are narrowly ovate to lanceo- 
late (extreme size 11 cm. X 32 mm.), maroon-purple, and the 
filaments are short, the anthers reaching 2 mm. in length, 
purple. Mrs. R. M. Austin’s No. 19, collected at Butte Creek, 
near Colby, Butte Co., Cal., July, 1896, agrees with the type 
except that the petals are white and the leaves constricted 
at base into a short petiole. 
The species extends apparently from Lake and Placer 
Counties, California, southward to San Luis Obispo County. 
Particular variations are found most commonly or exclusively 
in certain localities. 
14a. Var. chloropetalum (Torr.) Gates, comb. nov. 
Plate 7, fig. 1. 
T. sessile var. chloropetalum Torr. Pac. Rail. Rept. 4: 151. 
1856. 
T. chloropetalum Howell, Fl. N. W. Am. 1: 661. 1902, in 
art. 
Washington to California, in the coast region. 
The variety chloropetalum with greenish petals, originally 
described by Torrey as T. sessile var. chloropetalum from 
the ‘‘Redwoods,’’ California, is stated by Jepson to be **com- 
mon on the peninsula of Pt. Reyes in Marin Co." Torrey’s 
diagnosis was ‘‘petalis viridulis obovato ellipticis, obtusius- 
culis, sepala duplo superantibus.’’ The petals in specimens 
