1907] Hall.Compositae of Southern California. 229 



A. Perennial herbs and suffrutescent plants. 



Stems herbaceous: lower leaves either undivided or with broad and 



rounded lobes. 

 Leaves from entire to serrate or pinnatifid. 



Heads discoid: leaves ample 1. S. astephanus. 



Heads radiate. 



Plant leafy up to the inflorescenc : leaves acute. 



Blade of leaf triangular-lanceolate, 2 to 5 cm. wide 



2. S. triangularis. 



Blade of leaf linear, 1 to 3 mm. wide: var. sanctus of 



3. S. serra. 



Plant nearly leafless above the middle, 2 to 4 dm. high: leaves 



obtuse 4. S. ionophyllus. 



Leaves mostly pinnately divided or parted and again lobed or incised 



5. S. eurycephalus. 



Stems suffrutescent at base: leaves pinnately parted into linear lobes (ex- 

 cept the upper ones). 



Leaf -lobes acute: involucre copiously bracteolate 6. S. Douglasii. 



Leaf -lobes obtuse: involucre sparingly bracteolate: insular species 



7. S. Lyoni. 



B. Annuals. 



Eays conspicuous , 8. S. Calif orni<"us. 



Kays wanting or very inconspicuous. 



Indigenous desert annual: leaves ample 9. S. Mohavensis. 



Naturalized weeds. 



Involucral bracts with green or pale tips: rays present, minute 



10. S. sylvaticus. 



Involucral bracts black-tipped: rays none 11. S. vulgaris. 



1. S. astephanus Greene, Pitt. i. 174 (1888). 8. ilicetorum 

 Davidson, Eryth. ii. 85 (1894). 



Stout, erect, 4 to 10 dm. high, from a perennial root, leafy: 

 herbage floccose-woolly, the upper surface of the leaves and the 

 inflorescence glabrate : leaves thin, elliptic or oblanceolate, acute, 

 remotely dentate with small spreading callous-tipped teeth ; lower 

 leaves 2 to 3 dm. long including the petiole, 3 to 5 cm. wide; 

 upper leaves smaller, tapering to a sessile base, some entire : heads 

 6 to 12, nearly sessile in a compact terminal cyme: involucre 8 

 mm. high ; bracts numerous, linear-lanceolate, acute, some of the 

 outer ones reduced and calyculate : rays none : achenes 10-nerved. 

 glabrous. 



Mountains of San Luis Obispo Co., 1887, Mr. and Mrs. Lem- 

 mon, ace. to Greene ; Upper Sonoran Zone, on the trail to Wilsons 

 Peak, San Gabriel Mts., Davidson. 



