EUPHORBIA, SECTION TITHYMALUDS. 121 
tocera crenulata Engelm. in litt. in Boiss. DC. 
Prod. 15?: 143. 1862. 
Stems few to several, 1.5 to 3 dm. high, 2 to 4 mm. 
thick, branched below the umbel, erect or declined at base; 
rays 3 to 5, 2 or 3 times branched, 2 to 5 cm. long; leaves 
crowded below, 1 to 2 cm. apart above, spatulate to obo- 
vate, acute to retuse, 10 to 20 mm. long, 3 to 10 mm. 
wide, tapering to a petiole 2 to 3 mm. long, or sessile; 
umbel leaves wider, obovate to ovate; floral leaves trian- 
gular ovate, base truncate, connate, especially on the out- 
side, or nearly free, 10 to 20 mm. wide, 7 to 11 mm. 
long or sometimes larger, all the leaves usually erose den- 
ticulate; involucre 2 mm. high, 1 mm. wide; lobes trun- 
cate or dentate; glands 2 mm. wide, 1 mm. long, the white 
horns as long or longer, diverging; bracts thread-like, 
lobed or entire, smooth or sometimes pubescent; capsule 
2.5 to 3 mm. long, 3.5 to 4 mm. wide; styles 1.3 to 2 mm. 
long, slightly united at the base; seeds oblong ovoid to 
nearly spherical, truncate above, slightly flattened on the 
inner face, covered with irregular vermiculate ridges and 
large shallow pits to occasionally tuberculate or even almost 
smooth, a prominent ridge on the back, white or brown- 
ish. — Common mostly in the central valleys of California ; 
also in Oregon, southern California, Arizona, and Colorado. 
The Oregon forms approach #. commutata. — Plate 36. 
Specimens examined from California (Hansen, Elsie’s Creek, 1094, 1895, 
274, 1894; Brown, Shasta Co., 291; Dodd, Yosemite, 1891, seed almost 
tuberculate; Brandegee, Santa Inez Mts., 1888; Eastwood, Millwood, 
1896, Sansalito, 1896; Blaisdell, Big Trees, 40; Eisen, Fresno, 1879; 
Fritchey, Yosemite, 57; Baker, Modoc Co., 1893; Bigelow, Grass Valley, 
1853-4; Wilkes Exped., San Francisco, 1404; Newberry, La Pagosa, 1859; 
Palmer, Marin Co., 2409, 1892; Mt. Shasta, 2486, 1892; Brown, Sisson, 
291, 1897; Austin, Colby, 268, 1896; Ames, Plumas Co., 1875; Bridges, 
296 ; Hartweg, 1950; Cooper, Santa Inez Mts.,1879; Peckham, Ojai; Lem- 
mon, Calaveras Grove; LeConte, Mt. Shasta, 1882; Hansen, Amador Co., 
1095, 1892, 1067, 1895, 1977, 1896; Parry, 1874; Rattan, Sierra Nevada; 
Brewer, 618, Monterey, 1860-62; Nuttall; Wrangel; Pringle, Santa Cruz 
Mts., 1882; Vasey, Santa Lucia Mts.) ; Oregon (Hall, 1871; Howell, Mil- 
waukee, 300, 1880, Umpqua Valley, 87, 1881); Arizona (Lemmon, Rucker 
37 
