125. CoMPOsiTAE 249 



15. Leaves lanceolate, aeuniinate, 5-10 cm long, 

 1-2 cm wide, strongly clasping; bracts loose, 

 linear-lanceolate, attenuate; involucre 6-10 

 mm high; peduncles copiously glandular- 

 pubescent: rays 40-50; roadsides and moist 

 ground, common. Aug.-Oct. New Eng- 

 land Aster A. novae-angliae L. 



15. Leaves elliptical-lanceolate, acute, 2-5 cm 

 long, 4-10 mm wide (the upper ones 

 slightly, if at all clasping) ; bracts ap- 

 pressed, linear-oblong, acute, firm; involu- 

 cre about 5 mm high ; peduncles hirtellous 

 and minutely glandidar; rays 20-30; wooded 

 bluffs, local; Aug.-Oct...^. oblongijolius Nutt. 

 14. Heads few, scattered, solitary on slender pedun- 

 cles beset with minute bract-like leaves; in- 

 \olucre turbinate, 1 cm high; bracts appressed, 

 lincar-oblanceolate, acuminate, ciliolate, sparse- 

 ly pubescent on the back and minutely glandu- 

 lar; open woods, local; chiefly in s. 111. Aug.- 

 Oct A. patens Ait. 



13. Leaves, at least the lower, sharply toothed; bracts 

 glabrous; involucre 8-10 mm high; moist ground, 



local. Aug.-Oct A. puniceus L. 



12. Stem glabrous or the upper part pubescent in lines; 

 rays purple (rarely white). 

 16. Stem pubescent in lines; bracts of the involucre 

 acuminate. 

 17. Stem-leaves sharply serrate, oblanceolate, abrupt- 

 ly contracted into winged entire auriculate- 

 clasping petioles; moist ground, often along 

 streams or ditches, Jo Daviess, Fulton, Peoria, 



and Henry counties. Sept. -Oct 



A. prenanthoides Muhl. 



17. Stem-leaves entire or nearly so. 



18. Leaves lanceolate, 1-3 cm wide; stem 3-6 mm 

 in diameter near base; moist ground, n.e. 

 111., extending southw. to Menard Co. Aug.- 

 Oct A. lucidulus (A.Gray) Wieg. 



18. Leaves linear-lanceolate, 5-10 mm wide; stem 

 1.5-3 mm in diameter near base; swampy 



ground, rare, n. 111. Aug.-Sept 



A. longifolius Lam. 



16. Stem glabrous, often glaucous; leaves thick, lanceo- 

 late, mostly entire or nearly so; bracts acute, the 

 tips green, rhombic; sandy soil in woods, usually 



near streams. Aug.-Oct. Smooth Aster 



A. laevis L, 



