Jones: Flora of Illinois, 152. Compositae 257 



umbellata (Mill.) Nees] Flat-top Aster 



A. umbellatus Mill. 



17. Rays none; plants annual; heads campanulate, 8-12 mm. broad; 

 involucre 4-6 mm. high; pappus copious, soft; achenes appressed- 

 pubescent; leaves linear, entire, sessile, ciliolate, acutish; roadsides 

 and waste ground, local; adv. from the West. Cook Co., Moffatt, 

 Hill, Agnes Chase. July-Sept. \_A. angustus sensu auth., non Nees; 

 Brachyactis angustus (Lindl.) Britt.j A. brachyactis Blake 



15. Erigeron L. — Fleabane 



(Lepiilon Raf.) 



1. Rays conspicuous, longer than the pappus. 



2. Leaves clasping; rays lilac or purple; plants perennial. 



3. Stem simple; rays 50-75; involucre glandular-puberulent; open woods, 

 common. April-June E. pulchellus Michx. 



3. Stem branched above; rays 150-200; involucre hirsute, not glandular; 



open woods, roadsides, and fields, common. May-June 



E. philadelphicus L. 



2. Leaves not at all clasping; rays white or pink-tinged; plants annual or 

 biennial. 



4. Stem-leaves linear or narrowly lanceolate, finely pubescent, usually 



entire; involucre hirsutulous; basal leaves spatulate; roadsides, fields, 

 or dry open woods, chiefly in the n. half of the state. May-July. \E. 



ramosus sensu (Walt.) BSP., non Raf.} Daisy Fleabane 



E. strigosus Muhl. 



4. Stem-leaves lanceolate, ciliate, sparsely hirsute or glabrous, irregularly 

 sharply toothed, or the upper ones entire; involucre glabrous or with 

 a few hairs; basal leaves ovate, coarsely dentate, long-petioled, usually 

 absent at flowering time; fields, roadsides, waste places, and open 



woods, common throughout 111. June-Oct. Whitetop 



E. annuus (L.) Pers. 



1. Rays inconspicuous, scarcely, if at all, exceeding the pappus. 



5. Rays purplish; involucre about 2 mm. high; stem diffusely or divaricately 



branched; leaves all linear, entire; dry soil, local. June-Sept 



E. divaricatus Michx. 



5. Rays white; involucre 3-4 mm. high; stem strict; lower leaves spatulate. 

 toothed; common weed in cult, ground and along roads. Aug. -Oct. 

 Horseweed E. canadensis L. 



Tribe 5. Gnaphalieae 



16. Pluchea Cass. — Marsh Fleabane 



P. camphorata (L.) DC. Swamps and sloughs, not common; s. III. July- 

 Oct. [P. petiolata Cass.; P. viscida (Raf.) House.} 



