1(»7 



more or less united; llowers yellcnv: fiiiil tiil)erciihite at base, 

 prickly above, Ij^ lines long: seed-face deeply sulcate, more or 

 less involute (sometimes enclosinj? a central cavitv), with a central 

 longitudinal ridge. (Fig. 112.) 



California, from Kern county (Parish I'.tt"), to the Upper Sacramento 

 Valley. Fl. February and March. 



This species is said to have a very offensive odor. It seems to be rare 

 in hcibaria, and sometimes strangely confused with ,S'. hiphiunfiftda. . 



10. S. tuberosa Torrcy, Pacif. R. Rep. iv. 91. .Stem 8 

 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 uneciually 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 {PartMh !»82, VaMey). to Mendocino and Plumas 

 counties. Fl. February to May. 



This species is also said to have a very offensive odor. 



31. AMMO.SEL1NUM Torr. & Gray, Pacific. Rep. ii. 1«5. 

 — 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 unetiual umbels. 



A very distinct genus, and one of doubtful aftinity, but holding no 

 relation whatever to Clueroithijllum, as was surmised in the original de- 

 scription and followed by Bentham k Hooker. 



1. A. Popei Torr. & Gray, 1. c. About a span (sometimes 

 a foot) high, with stem-angles, rays, pedicels, and ribs of fruit 

 rough scabrous: leaf-segments narrowly linear: fruit ovate-oblong, 

 2 to 2i^ lines long, with thick corky commissure. — Apiutn Popei 

 Gray, Proc. Am. Acad. vii. 348. 



In sandy soil, W. Kansas (K. X Plank), Texas (Wright. Parry, 

 Rererchon, Misn Croft). New Mexico ( Wriyht). Arizona iPringle. in 1S82. 

 very large forms), and extending into Mexico. Fl. .\pril and May. 



2. A. Butleri C. &. R. Hot. Ga/ette, vii. 2«4. Smaller, 

 nearly glabrous: Icaf-scgmcnts narrowly oblong or spatulate: fruit 



