1907] Hall. Compositae of Southern California. 87 



leaves 5 to 12 mm. long, the lower spatulate or obovate, the upper 

 varying to linear or nearly filiform : involucre 5 mm. high ; 

 bracts lanceolate, acute : rays 12 to 20, 5 to 10 mm. long. 



Gravelly soil on the summit of Tahquitz Peak, San Jacinto 

 Mts., 2700 m. alt., Hall, no. 2322; Providence Mts., May 30, 1902, 

 Brandegee, east to Kansas, south into Mexico. I am indebted to 

 Mrs. Katharine Brandegee for calling my attention to the iden- 

 tity of Erigeron Jacinteus with this species. 



24. ERIGERON L. FLEABANE. 



Herbs, with entire or toothed alternate generally sessile 

 leaves and solitary or cymose or rarely paniculate heterogamous 

 heads. Involucre campanulate or hemispheric ; bracts narrow, 

 equal, little imbricated, seldom coriaceous or green-tipped. Re- 

 ceptacle flat or convex, usually naked. Ray-flowers exceedingly 

 numerous, pistillate ; ligules white or pink or purple, or in some 

 species wholly wanting. Disk-corollas yellow. Style-appen- 

 dages (at least in our species) triangular, obtuse to truncate, 

 rarely much exserted. Achenes flattened, usually pubescent 

 and nerved. Pappus more scanty and fragile than in Astor, 

 often with a distinct short outer series. 



A. Bays conspicuous, much surpassing the disk. 



Involucre 2 cm. or more wide: leaves over 1.5 cm. wide: submaritime 

 perennial 1. E. glaucus. 



Involucre, and usually also the leaves, much narrower. 



Plants low, mostly under 3 dm., simple or diffusely branched. 

 Leaves entire. 



Eoot perennial. 



Herbage canescent or silvery with a soft appressed pubescence. 



Pappus double: stems stout, silvery-white 2. E. Parishii. 



Pappus simple: stems slender, merely canescent 



4. E. linearis. 



Herbage green or cinereous with a harsh pubescence. 



Stems crowded on a thick multicipital caudex: pappus 



double, the outer series short 3. E. concinnus. 



Stems from slender rootstocks: pappus simple 



6. E. sanctarum. 



Eoot annual or biennial: heads loosely cymose.. 12. E. divergens. 

 Leaves ternately parted 5. E. compositus. 



