Dec, 11)17] The Asterecc oj Ohio 55 



angiate; disk flowers yellow and bisporangiate. Pappus of 

 slender scabrous or denticulate bristles in one series or some- 

 times a shorter additional outer series. 



Heads 1-13-2 in. broad, few; stem simple, pubescent. E. pulcliellns. 



Heads J^-1 in. broad, many; stem branched. 2. 



Ravs 100-150, mostly purple or violet. E. philadelphiciis. 



Rays consideral)ly less than 100, white, sometimes purple tinged. 3. 

 Stem leaves linear lanceolate, the upper entire, the lower seomwhat dentate. 



E. ramosus. 

 3. Stem leaves lanceolate, all but the extreme upper ones sharply serrate. E. annus 



1. Erigeron pulchellus Mx. Showy Fleabane. Slender 

 simple villous plants, perennial by stolons and offsets, 10-24 in. 

 high. Basal leaves tufted, spatulate or obovate, somewhat 

 wedgeshape at the base, narrowed into slender margined 

 petioles, obtuse at the apex, 1-3 in. long, \-2 in. wide, dentate, 

 stem leaves partly clasping, oblong, lanceolate or ovate, acute, 

 entire or slightly serrate. Heads 1-6, on slender peduncles; 

 rays numerous, white or purple, \-^ in. long; bracts of the 

 depressed hemispherical involucre linear, acuminate, villous. 

 Pappus simple. Achenes nearly glabrous. On hills and banks. 

 April to June. General. 



2. Erigeron philadelphicus L. Philadelphia Fleabane. 

 Slender, soft pubescent or sometimes nearly glabrous plants, 

 with nodding heads, perennial by stolons and offsets, mostly 

 branched above, 1-3 ft. high. Basal and lower leaves spatulate 

 or obovate, dentate, obtuse at the apex, narrowed to short 

 petioles, 1-3 in. long; the upper stem leaves clasping, obtuse 

 or acute, often clasping at the base, entire or sometimes dentate. 

 Heads several or numerous, ^-1 in. broad, on the slender 

 peduncles of a corymbose, paniculate inflorescence, the peduncles 

 thickened at the summit; rays 100-150, light rose purple to 

 pinkish; bracts of the depressed hemispherical involucre linear 

 and mostly scarious margined. Pappus simple. Achenes 

 pubescent. In fields and woods. April to August. General. 



3. Erigeron annus (L.) Pers. White-top Fleabane. Annual 

 erect corymbosely branched plants sparingly pubescent with 

 spreading hairs, 1-4 ft. high. Leaves thin; the lower and basal 

 ones ovate to ovate-lanceolate, obtuse, petioled, usually coarsely 

 dentate, 2-G in. long, 1-3 in. wide; the upper sessile or short- 

 petioled, oblong to linear-lanceolate, acute or acuminate, 

 sharply dentate at the middle, those of the branches narrow 

 and often entire. Heads rather numerous, |-f in. broad. 



