JoNcS: Flora of Illinois, 152. Compositae 261 



2. Stem usually leafy to the inflorescence. 



3. Heads small, 1.5-3 cm. broad, the rays about 1 cm. long, the disk 5-8 

 mm. broad; leaves lanceolate, acuminate, serrate, petiolate, more or 

 less scabrous on both surfaces; stem glabrous or nearly so; sandy soil 



in open woods, local, s. 111. Aug.-Oct H. microcephalus T. & G. 



3. Heads large, 4-8 cm. in diameter, the rays 2-4 cm. long. 



4. Bracts oval, acutish or obtuse, usually glabrous on the back, closely 

 and evenly ciliolate, shorter than the disk, erect, closely appressed; 

 disk usually purple-brown; leaves lanceolate, thick, scabrous, nar- 

 rowed at the base; sandy or prairie soil, locally abundant. July- 

 Sept. [W. scaberrimus Ell.; H. subrhotnboideus Rydb.} Prairie 



Sunflower H. rtgidiis (Cass.) Desf. 



4. Bracts lanceolate or linear-lanceolate, acuminate; disk-flowers yellow. 

 5. Leaves sessile or subsessile. 



6. Stem hirsute or hispidulous; leaves ascending. 



7. Stem villous-hirsute; leaves finely and densely grayish pubes- 

 cent on both surfaces, ovate or ovate-lanceolate, acute, 3- 

 veined above the slightly clasping base, all opposite; bracts 

 copiously pubescent; heads solitary or few; rays 2-3 cm. 



long; prairie soil, locally abundant. Aug. -Sept 



H. mollis Lam. 



7. Stem more or less hispidulous or scabrous; leaves lanceolate or 



ovate-lanceolate, acuminate; heads several, panicled. 



8. Leaves lanceolate, hirsutulous beneath, faintly 3-veined from 



the cuneate, somewhat ciliate base; rays 1-2 cm. long, pale 



yellow; moist ground, local. Peoria, Brendel; Woodford 



Co., McDonald H. giganteus L. 



8. Leaves ovate-lanceolate, finely and rather copiously grayish 

 short-pubescent beneath, the lateral veins confluent some- 

 what below the middle; rays 2.5-4 cm. long, bright yel- 

 low; roadsides and fields, not common. Sangamon Co., E. 



Hall in 1860; Kankakee Co., G. N. Jones 



H. doronicoides Lam. 



6. Stem glabrous or nearly so, glaucous, slender; leaves divaricate, 

 lanceolate, acuminate, 3-veined from the rounded base, sca- 

 brous on both sides; roadsides and open woods, local. July- 

 Sept W- divaricatus L. 



5. Leaves manifestly petioled. 



9. Stem smooth or nearly so, glaucous. 



10. Leaves triple-veined from near the base, chiefly opposite, at 

 least below the inflorescence, abruptly contracted into mar- 

 gined petioles. 

 11. Leaves lanceolate, shallowly serrate to entire, firm, the 

 lower surface hirsutulous or glaucous; roadsides and 

 open woods, common. July-Sept. [H. arenicola E. E. 

 Wats.; H. jormosus E. E. Wats.; H. leontnus E. E. 

 Wats.} H. strumosus L. 



