144 PITTONIA. 
Greene, Fl. Fr. 283 mainly. Plant 4 to 10 inches high, — 
freely and sometimes almost diffusely branching, the basal 
leaves few and not rosulate, mostly spatulate, the cauline 
many, usually in whorls of 3, or in pairs, # to 1 inch long, 
many-nerved, the nerves apt to run together and form an 
elongated reticulation: torus-rim not obvious: corollas white, 
1 inch broad, the petals obovate: stamens 12, unequal, those 
of the inner series with filaments dilated at base, the dilata- 
tion ending at or below the middle of filament in a pair of 
salient subulate teeth ; anthers short and adnate. 
This fine species, exhibiting by much the largest flowers 
in the genus, is apparently confined to the coast hills of 
Middle California, particularly in the immediate vicinity of 
San Francisco. About the best specimens extant are those 
collected many years since, in the San Bruno Hills, by the 
late venerable Dr. Albert Kellogg. 
5. M. DENTICULATA, Greene, Bull. Calif. Acad. ii. 99. 
Platystigma denticulatum, Greene, Bull. Torr. Club, xiii. 218; 
Gray, Syn. Fl. i. 85. Platystemon denticulatus, Greene, Fl. 
Fr.283. Plant 3 to 10 inches high, erect, parted above into : 
many filiform branches and peduncles: rosulate basal leaves 
with rhombic-ovate blade and longer linear petiole, the 
former notably reticulate-venulose, entire or with a few teeth; 
cauline mostly in whorls of 3, spatulate to linear, obtuse, den- 
ticulate: torus with no rim: corolla white, about 4 inch 
broad; petals oblong: stamens about 6, in one series and 
equal; filaments short, linear or somewhat subulate, not 
longer than the elongated and linear innate anthers. 
This fine species, established upon a goodly number of 
strong characters, is well distributed throughout southwestern 
California, extending to several of the coast islands, and 
northward on the mainland to Monterey Co. (Gonzales, J. B. 
Hickman, and Castroville, T. S. Brandegee). It is the only 
