266 Studies on Californian Plants. [zoE 
H US ACAULIS (Nutt) Gray. The achenes are com- 
monly described as ‘‘canescently villous’’ (Gray, Syn. Fl. ), or 
as.‘ silky-pubescent ’’ (Gray, Bot. Calif.), but there is consider- 
able variation in this character. Plants from Mt. Tallac (Hal/ 
Chandler, No. 4612) exhibit two forms, the one with silky- 
together among rocks in the Hudsonian Zone. Pyramid Peak - 
specimens (Hall & Chandler, No. 4734) have mostly glabrous 
achenes, but in a few cases the whole surface of the achene is 
covered with a villous me actu which approaches the silky 
character of the typical form. e following collections have 
glabrous achenes: near Baecne tie Calif., Brandegee,; 
Washoe Co., Nevada, O. F. Hezzer; Steins Mts., Ore., Cusick, 
of the Rocky Mt. collections at hand, as well asa majority of 
the Californian collections, exhibit only ‘pubescent achene 
SENECIO TRIANGULARIS Hook. Acco ording to Prof. Greene, all 
of the Californian forms should be received into his S. ¢rigono- 
phyllus. ‘This species is supposed to have more finely serrate and 
Rocky Mt. form is frequently compound, — in ours a is some- 
times simple; and the involucre measures 8 to 10 . high, as 
against 6 to 8 mm. in Californian plants. If there is isa a difference 
in leaf-texture, I am unable to detect it in dried specimens. But 
according to field observations, this character varies considerably 
in a given locality, being largely dependent upon degree of ex- 
posure. The form which Professor Greene probably had in 
hand while describing 5S. trigonophyllus is plentiful in the Lake 
Tahoe district, in shaded places, but since it ae by all its 
characters into typical S. triangularis, which is also common in 
ee soir Shane Sierra, it cannot be specifically senate, either 
morphologic or geographic grounds. 
sa DIOLUS HEpypnots All. Collected on a vacant oe in 
the southern part of Los Angeles s, May 14, 1905, 7. W. Minthorn. 
This weed of the Mediterranean region hids fair to become com- 
mon in California, having been previously reported from such 
widely separated stations as Sonoma Co., Mariposa Co., and San 
Diego. 
