107 
more or less united; flowers yellow; fruit tuberculate at base, 
prickly above, 1% lines long: seed-flice deeply sulcate, more or 
less involute (sometimes enclosing a central cavity), with a central 
longitudinal ridge. (Fig. 112.) 
California, from Kern-county {Parish to the Upper Sacramento 
Valley. FI. February and March. 
This species is said to have a very offensive odor. It seems to be rare 
in herbaria, and sometimes strans:ely confused with S. hipinnatiflda. 
10. S. tuberosa Toney, Pacif. R. Rep. iv. 91. Stem 3 
inches to 2 feet high, from a small globose tuber: leaves twice or 
thrice pinnate, usually very finely divided, ultimate segments very 
small: umbel 1 to 4-rayed, with involucre of leaf-like bracts, and 
involucels of small unequally united bractlets: flowers yellow, the 
sterile ones on long pedicels: fruit broader than long, more flat- 
tened latterally than in any other species, a line long, strongly 
tuberculate: seed somewhat laterally flattened, with plane face. 
(Fig. 113.) 
Dry hills and woods, California, from San Diego county {Cleveland i2l) 
and San Bernardino county {Parish 982, Vasey), to Mendocino and Plumas 
counties. FI. February to May. 
This species is also said to have a very offensive odor. 
31. AMMOSELINUM Ton*. Be Gray, Pacific. Rep. ii. 165. 
— Low diffuse annuals, with ternately divided leaves, the small 
ultimate segments linear to spatulate, involucre and involucels of 
entire or dissected bracts, and white flowers in small sessile or 
short-pedunculate unequal umbels. 
A very distinct genus, and one of doubtful affinity, but holding no 
relation whatever to Chcerophyllum, as was surmised in the original de- 
scription and followed by Bentham & Hooker. 
1. A. Popei Ton*. & G ray, 1. c. About a. span (sometimes 
a foot) high, with stem-angles, rays, pedicels, and ribs of fruit 
rough scabi'ous: leaf-segments narrowly linear: fruit ovate-oblong, 
2 to 2^ lines long, with thick corky commissure . — Apium Popei 
Gray, Proc. Am. Acad. vii. 343. 
In sandy soil, W. Kansas {E. N. Plank), Texas {Wright, Parry, 
Reverchon, Miss Croft), New Mexico {Wright), Arizona {Pringle, in 1882, 
very large forms), and extending into Mexico. FI. April and May. 
2. A. Butleri C. &. R. Pot. Gazette, vii. 294. Smaller, 
nearly glabrous: leaf-segments narrowly oblong or spatulate: fruit 
