Jones: Flora of Illinois, 152. Compositae 253 



5. Rays white, 7-15, narrow, 1 cm. or more in length; heads few, 

 large, 1-1.5 cm. high; bracts obtuse, appressed, puberulent, ciH- 

 ate; leaves sharply serrate, scabrous on both sides; wooded bluffs, 

 rare. Starved Rock, Thone. Aug.-Oct A. furcatus Burgess 



5. Rays usually purple; leaves entire or slightly dentate. 



6. Bracts short-hirsute, recurved, lanceolate, acuminate; rays 30-45; 

 bluffs and rocky woods, Peoria and Woodford counties and 



southw. to the Mississippi R. Sept. -Oct 



A. anomalus Engelm. 



6. Bracts erect; rays 10-15; leaves often glabrous or nearly so above, 

 finely and sparingly pubescent beneath; banks and dry open 

 woods, local. Aug.-Oct A. shortii Lindl. 



4. Bracts glabrous or nearly so; rays 8-15, usually blue, 6-8 mm. long. 

 7. Leaves firm, all entire or nearly so; involucres 6-7 mm. high, tur- 

 binate, the bracts linear- spatulate, imbricate in several series, 

 with green, abruptly acute tips; sandy soil, and in open woods, 

 local. Sept.-Oct A. azureus Lindl. 



7. Leaves thin, nearly all sharply serrate. 



8. Involucres 4-6 mm. high, the bracts obtuse or obtusish, ap- 

 pressed; stem glabrous or nearly so; dry woods, not infrequent 

 throughout 111. Aug.-Oct A. cordif alius L. 



8. Involucres 6-10 mm. high, the bracts acute or acuminate. 



9. Stem densely and finely pubescent; tips of the bracts ap- 

 pressed; dry open woods, local; apparently absent from the 



s. counties. Sept.-Oct. \_A. hirtellus Lindl.] 



A. drummondii Lindl. 



9. Stem glabrous or nearly so; tips of the bracts spreading; dry 



woods, common and variable. Aug.-Oct 



A. sagittifolius Wedem. 



1 . Lower leaves neither cordate at the base nor long-petioled. 



10. Stem-leaves clasping or auricled at the base. 

 11. Stem pubescent throughout. 

 12. Leaves essentially entire. 



13. Heads large; leaves strongly clasping. 



14. Stem hirsute; involucre 8-10 mm. high, the bracts loose, 

 spreading; roadsides and moist ground, common. Aug.- 

 Oct. New England Aster A. novae-angliae L. 



14. Stem hispidulous; involucres 6-7 mm. high, the bracts 

 appressed, pubescent on the back; open woods, local; 



chiefly in the s. part of the state. Aug.-Oct 



A. patens Ait. 



13. Heads small; involucre 6 mm. high; stem hirsute; wooded 



bluffs, local. Aug. -Sept A. oblongijolius Nutt. 



12. Leaves, at least the lower, sharply toothed; bracts glabrous; in- 

 volucre 8-10 mm. high; moist ground; local. Aug.-Oct 



A. puniceus L. 



