Aster Tribe 103 



or campanulate, its bracts narrow, nearly equal, usu- 

 ally imbricated in but 1 or - scries. Receptacle nearly 

 flat, usually naked. Ray-flowers purplish or whitish. 

 pistillate. Disk-flowers yellow, tubular, perfect, 5-lobed. 

 Style-appendages short, mostly rounded or obtuse. 

 Aehenes flattened, mostly 2-nerved. Pappus-bristles 

 scabrous, in 1 series or with an outer shorter series. 



1. E. Philadelphicus L. Perennial by stolons, soft-pubescent 

 or sometimes nearly glabrous; stems slender, mostly branched 

 above, 3-6 dm. high; lower leaves spatulate or obovate, obtuse, 

 dentate, 2.5-7 cm. lorjg, narrowed into a short petiole; upper 

 leaves clasping, often cordate at base, entire or dentate; heads 

 several or many, corymbose-paniculate, 1-2 cm. broad ; peduncles 

 slender, thickened at the summit; involucre depressed hemi- 

 spheric : its bracts linear, usually scarious-margined ; rays 100-150, 

 4-s mm. long, light rose-purple; pappus simple; aehenes puberu- 

 lent. 



Occasional in low moist ground. 



2. E. foliosus Nutt. Scabrous and somewhat strigose-pubes- 

 cent, 4-8 dm. high, leafy throughout ; leaves narrowly oblanceolate, 

 entire, about 4 mm. broad, 3-6 cm. long, those of the branches 

 reduced; heads hemispheric, 12-14 mm. broad; rays about 30, 

 narrow, purple; aehenes with a few coarse bristly short hairs. 



Frequent in sandy soil toward the coast. 



4. E. fragilis Greene. Stems erect, rigid, -5-7 dm. high, 

 minutely scabrous, leafy; leaves linear-filiform, 3-5 cm. long, 

 rigid, rough with minute incurved hairs; heads usually 10-15, 

 arranged in a loose corymbose panicle on spreading branches; 

 involucre campanulate, its bracts in about 3 series; rays 30-40, 

 very narrow, deep violet; aehenes nearly glabrous. 



Frequent on the dry plains and foothills away from the coast. 



17. LEPTILON Raf. 



Annual or biennial herbs with small racemose or 

 panicled heads of white flowers. Involucre mostly cam- 

 panulate, its narrow bracts in 2 or 3 series. Kays small, 

 usually shorter than the diameter of the disk, pistillate, 

 or none. Disk-flowers perfect, usually 4-toothed or 



