Chicory Tribe 449 



2. M. Cleveland! Gray. Annual, paniculately branched, 5 

 dm. high or less; stems and branches rather naked ; only some 

 of the basal leaves pinnatifid ; heads numerous; involucre about 

 6 mm. high, narrow, few-flowered ; bracts usually purplish- 

 tipped ; flowers yellow ; achenes oblong-linear, minutely striate- 

 costate, 4-5 of the ribs more prominent; outer pappus of 1 

 persistent bristle and a conspicuous circle of narrow white setu- 

 lose teeth. 



Occasional in the San Gabriel Mountains. More common in the mountains 

 and foothills of Riverside and San Diego Counties. May-July. 



3. M. saxatilis tenuifolia (Nutt.) Gray. Somewhat suffru- 

 tescent and leafy, paniculately branching, perennial, minutely 

 tomentose, soon becoming glabrate or glabrous, 6-12 dm. high ; 

 the long slender loosely-paniculate branches bearing slender 

 pedunculate heads; involucre broadly campanulate, about 1 cm. 

 high ; the loose calyculate bracts numerous, subulate, passing into 

 similar bractlets on the peduncle; flowers white, changing to rose 

 color; achenes narrowly oblong, 10-15 costate, becoming some- 

 what 4-5-angled, apex slightly contracted, bearing a very short 

 multidenticulate white border. 



Common in stony places in the foothills, especially toward the coast. 

 April-May. 



77. SONCHUS L. SOW-THISTLE. 



Annual succulent herbs with alternate mostly auricu- 

 late-clasping entire Or pinnatifid prickly-margined leaves 

 and yellow flowers in corymbose or paniculate heads. 

 Involucre usually becoming thickened and more or. less 

 conic at base, its bracts imbricated in several series, the 

 outer successively smaller. Receptacle flat, naked. 

 Achenes flattened, 10-20-ribbed, truncate. Pappus of 

 copious soft white simple capillary bristles usually fall- 

 ing away connected. 



1. S. oleraceus L. Stoutish, 5-10 dm. high, sparingly leafy, 

 glabrous or with a few glandular hairs on the pedicels and 

 involucre, glaucescent; leaves obovoid or narrower, runcinate- 

 pinnatifid, toothed but not prickly-margined, amplexicaul, the 

 auricles straight, acute; achenes striate-nerved, transversely 

 rugulose-scabrous. 



Common everywhere, flowering at all seasons. Native of Europe. 



