402 Astereae 



racemose-paniculate inflorescence, the whole plant cinereously 

 and roughly pubescent; leaves oblong-lanceolate, acute, 5-7.5 

 cm. long, remotely and faintly serrate; heads numerous in an 

 ample cymose panicle ; involucres nearly hemispheric, about 6 

 mm. high; bracts in rather few series, spatulate-linear, very 

 obtuse, wholly green-herbaceous; rays dull pale purplish. 

 Occasional on dry wooded hills about Los Angeles and eastward. 



2. A. hesperius Gray. Stems paniculately branched, 6-10 

 dm. high, varying from nearly glabrous to scabrous-pubescent; 

 leaves lanceolate, entire or the larger with a few denticulations, 

 5-10 cm. long, 6-15 mm. wide; heads crowded, 8-10 mm. high; 

 involucre of narrowly linear or more attenuate acute or gradually 

 acuminate erect bracts, either unequal and imbricated or with 

 some loose and slender herbaceous exterior ones which equal the 

 inner ; rays either white or violet, 6-8 mm. long. 



Cienega, near Los Angeles, and in low ground about San Bernardino. 



3. A. Greatae Parish. Stems erect or assurgent, '4-17 dm. 

 high, glabrous or above sparsely hirtellous ; leaves thin, ovate, 

 oblong-lanceolate or lanceolate, 6-15 cm. long, the scabrid mar- 

 gins few-toothed or entire, the base clasping ; the uppermost 

 usually reduced to linear or linear-lanceolate bracts; heads 5 

 mm. high, in an ample panicle; involucral bracts loosely imbri- 

 cated in a few series, lanceolate, green, minutely ciliate; rays 

 30-40, light purple, narrow, acute, 5-10 mm. long; achenes hir- 

 sute. 



Occasional in the canyons of the San Gabriel Mountains, mostly in the 

 upper portions of the chaparral belt. 



** Annuals. 



4. A. exilis Ell. Stem erect, 6-12 dm. high, rather stout be- 

 low, paniculately branched above into numerous slender branches ; 

 lower leaves lanceolate, the upper linear, mostly entire ; heads 

 small, numerous, about 6 mm. high, narrow; bracts of the invo- 

 lucre linear-subulate; rays 15-40, bluish-purple or pinkish. 



Frequent in low subsaline places, especially along the coast. August- 

 October. 



16. ERIGERON L. 



Branching or scapose herbs, with alternate or basal 

 leaves and corymbose, paniculate or solitary heads of 

 both tubular and radiate flowers. Involucre hemispheric 



