125. CoMPOsiTAE 253 



ground, river banks, 

 woo ds, common. 

 Aug.-Oct. [A. panicu- 

 latus Lam., not Mill.; 

 A. tradescanti of auth., 

 not L. ; A. interior 



Wieg.] 



A. simplex Willd. 



32. Stem-leaves thick, firm, glossy, 

 yellowish green, lanceolate, 

 usually entire, 5-10 mm wide, 

 the tips involute and indu- 

 rated, the upper surface sca- 

 brous near the margins and 

 toward the tip; branches and 

 branchlets very leafy; rays 

 lilac purple; involucre 4-6 

 mm high; moist ground, com- 

 mon throughout 111. Sept.- 



Oct. [A. salicifolius Ait.] 



A. praealtus Poir. 



22. Involucres 6-9 mm high. 



35. Leaves numerous, linear, entire, sessile, 1- 

 nerved, rigid, 1-3 cm long, 2-3 mm 

 wide; rays 10-15, violet or rarely white, 

 7-10 mm long; sandy soil in woods in 

 the northern half of the state. Sept.- 

 Oct. [lonactis linariif alius (L.) Greene] 



A. li7iariifolius L. 



35. Leaves large, 15-60 cm long, coarse, ellip- 

 tical, acuminate, all but the reduced 

 upper ones serrate; stems stout, angular, 

 1-2 m tall; rays 15-20, purple, 1-1.5 cm 

 long; cult., and occasionally escaped and 

 persisting; native of E. Asia. Sept. -Oct. 

 Tatarian Aster A. tataricus L.f 



20. Heads in a flat-topped corymb; rays white or whitish; 

 involucres 4-5 mm high. 



36. Leaves rigid, linear-lanceolate, acute; rays about 

 8 mm long; sandy soil in the northern half of 

 the state, extending southward to Kankakee 

 and Menard counties. Aug.-Sept. \A. lutescens 

 (Lindl.) T. & G.]; suggested by E. J. Hill in 

 1883 to be a hybrid between A. ptarmicoides 



and Solidago riddellii 



A. ptarmicoides (Nees) T. & G, 



36. Leaves lanceolate, acuminate, not rigid; rays 4-6 

 mm long; pappus double, the outer bristles 



