Groundsel Tribe 439 



long, and 4 mm. wide, plane ; those of the branches often filiform, 

 deciduous, some of the upper changed to long soft spines; heads 

 corymbose or glomerate at the summit of the branches ; involucre 

 5-9-flowered, its bracts 5-6; pappus fine, concealed by the long 

 wool of the achene. 



Dry washes of the interior valleys, perhaps not within our region but 

 found as far westward as Cucamonga. July- August. 



63. SENECIO L. 



Annual or perennial herbs or shrubs, with alternate 

 or basal leaves, and solitary corymbose or paniculate 

 many-flowered heads of both tubular and ray-flowers or 

 only tubular, in ours yellow. Involucre cylindric or 

 campanulate, its principal bracts in 1 series, distinct or 

 united at the base, usually with some shorter outer ones. 

 Receptacle flat or somewhat convex, mostly naked. 

 Rays when present pistillate. Disk-flowers perfect, 

 5-toothed. Achenes terete or those of the marginal 

 flowers so ewhat compressed, 5-10-ribbed, papillose or 

 canescent and usually emitting a pair of spiral threads 

 after wetting. Pappus copious, of white scabrous or 

 smooth capillary bristles. 



1. S. vulgaris L. Annual, puberulent or glabrate; stems 

 slightly fleshy, 1-3 dm. high, more or less branched; leaves clasp- 

 ing at the base, pinnatifid, the lobes and sinuses sharply toothed ; 

 heads 7-9 mm. high; bracts black-tipped; rays none; achenes 

 slightly canescent. 



Common in neglected gardens and yards. Flowering throughout the year. 

 Native of Europe. 



2. S. Californicus DC. Annual, glabrous or becoming so, 

 slender 1.5-4 dm. high ; leaves lanceolate in outline, varying from 

 denticulate to pinnatifid, the lobes short and obtuse, all but the 

 lowest sessile and auriculate-clasping, 2.5-5 cm. long; involucre 

 6-8 mm. high, its bracts narrow; rays oblong, 6-8 mm. long, 

 light yellow ; achenes canescent. 



Common in sandy soil in dry places in our interior valleys and foothills, 

 and on the sand-dunes along the seashore. February-May. 



3. S. ilicetorum Davidson. Stems erect, from a biennial or 

 perennial root, 5-10 dm. high, very floccose-woolly, at length 



