Carrot Family 279 



slender rays ; involucre of 2-3 small leaf-like bracts ; involucels 

 of 6-8 small entire bractlets; flowers yellow, the sterile ones 

 short-pedicelled ; fruit sessile but distinctly stipitate, obovate, 2-4 

 mm. long, covered with strong bristles; seed-face sulcate. 

 Frequent in the foothills in moist woods. 



2. S. arguta Greene. Stems more or less branching, 1.5-4.5 

 dm. high, from a thickened rootstock ; leaves palmately 5-parted, 

 the middle division elongated and distinct, all the divisions more 

 or less palmately lobed and toothed, decurrent upon the rachis, 

 forming a broad toothed wing, teeth spinosely pointed ; umbel 

 3-5-rayed; involucre of leaf-like bracts; involucels of linear to 

 linear-lanceolate spinosely pointed bractlets ; flowers yellow, the 

 sterile ones on pedicels 3-4 mm. long; fruit obovate, tapering 

 into a stipitate base, somewhat naked below, more bristly above, 

 6 mm. long. 



Frequent on grassy hillsides and mesas, extending from Santa Barbara 

 to San Diego. 



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 bract- 

 lets ; 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 

 numerous 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. 



* Leaves pinnately divided. 



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 



