AMMIACEAE. 257 



3. S. laciniata H. & A. Usually slender, branching from the 

 base, 1-6 dm. high; leaves broadly ovate-orbicular in outline, from 

 slightly 3-lobed to deeply 3-parted, the divisions from toothed to 

 laciniately cut, with bristle-tipped teeth; umbel 3-5-rayed; involucre 

 of leaf-like bracts; involucels of small apiculate bractlets; flowers 

 yellow; fruit orbicular, not at all stipitate, 3 mm. long. 



Rather common on hillsides and in open places in the chaparral 

 belt. 



4. S. nevadensis Wats. Low, with very short stems, the numer- 

 ous stoutish peduncles arising from near the base, 2 dm. high or 

 less; leaves ternate, the divisions oblong-ovate, 3-5-lobed, the 

 segments lobed or toothed; umbels with 3-10 rays; involucre of 

 pinnatifid leaf-like bracts; involucels of small, oblong, acute, more 

 or less united bractlets; fruiting rays 1.5-3.5 cm. long; flowers 

 yellow, the sterile ones on pedicels 2-3 mm. long; fruit bristly all 

 over, 3 mm. long; seed-face concave. 



Occasional in the upper portions of the chaparral belt and pine 

 belt. Santiago Peak, Santa Ana Mountains; San Bernardino 

 Mountains. 



5. S. bipinnatifida Dougl. Stems 3 dm. or more high, from a 

 thickened rootstock, with usually a cluster of leaves at the base, 

 and 1-3 leaves above; leaves pinnately 3-7-parted, the divisions 

 incisely toothed or lobed, decurrent on the rachis, and forming a 

 toothed wing; teeth acute or slightly pointed; umbel with 3-4 

 elongated rays; involucre of leaf-like bracts; involucels of small 

 narrow acute bractlets; flowers purple, in dense heads, the sterile 

 ones pedicelled; fruit bristly all over, 3 mm. long; seed-face broadly 

 concave with a prominent central longitudinal ridge. 



Occasional on grassy hillsides. 



6. S. bipinnata H. & A. Slender, 2-4 dm. high, from a slender 

 fusiform root; leaves twice or thrice pinnate, with divisions not 

 at all decurrent on the rachis, cuneate-oblong to ovate, incisely 

 and mucronately toothed; umbel 3-4-rayed; involucre of leaf-like 

 bracts; involucels of a few small bractlets more or less united; 

 flowers yellow; fruit 3 mm. long, with strong tubercles tipped with 

 short hooked bristles; seed-face deeply sulcate, sometimes inclosing a 

 central cavity, with a central longitudinal ridge. 



Los Angeles River, San Fernando Valley; Oak Knoll, Pasadena. 



7. S. tuberosa Torr. Stems 1-6 dm. high from a small globose 

 tuber; leaves twice or thrice pinnate, usually very finely divided, 

 ultimate segments very small; umbel 1-4-rayed; bracts leaf-like; 

 bractlets unequal, united; flowers yellow, the sterile ones on long 

 pedicels; fruit broader than long, rather strongly flattened laterally 

 for the genus, 2 mm. long, tuberculate and not at all bristly; seeds 

 somewhat laterally flattened, with plane face. 



Occasional in open places in the foothills. 



4. ERYNGIUM L. 



Glabrous perennials, with often rigid coriaceous spi- 

 nosely toothed or divided leaves, and white or blue flowers 



18 



