125. COMPOSITAE 241 



7. Leaves sessile or nearly so, sparingly toothed above the 



middle, or entire; heads 6-8 mm IukIi, about 5-flow- 

 ered; woods near streams, and along roads. Aug.-Oct. 



Tall Thoroughwort E. altissimum L. 



6. Stem glabrous or pubcrulcnt; leaves all opposite. 



8. Leaves sessile, lanceolate, pinnately veined, serrate; heads 



about 5-flowered; woods, local. Aug.-Oct. Upland 



Boneset E. sessilifolium L. 



8. Leaves petioled, ovate, triple-nerved, coarsely dentate 

 (puberulent beneath in var. tomcntellum (B. L. 

 Robins.) Blake) ; heads 10- 30-flowered; woods, com- 

 mon. July-Sept. White Snakeroot [E. ageratoides 



L.f. ; E. urticaejolium Reich.] E. rugosian Houtt. 



4. Flowers purplish to blue; leaves ovate, petiolate, crenate-den- 

 tate, more or less puberulent. 

 9. Flowers pink to pale purple; receptacle flat; bracts acute, 

 unequal, the outer less than half as long as the inner; 

 woods, not common; Alexander and Pulaski coun- 

 ties, E. J. Palmer in 1919. Aug-Oct. Pink Eupatorium 



E. incarnatum Walt. 



9. Flowers blue or violet; receptacle conical; bracts acuminate, 

 nearly equal; moist ground in the southern half of the 

 state, extending northward to Hancock and Vermilion 

 covmties. July-Oct. Mistflower [E. coelestinum f. illinoense 

 Benke] E. coelestinum L. 



8. Mikania Willd. 

 M. scandens (L.) Willd. Climbing Hempweed. In alluvial soil, 

 not common; Alexander, Johnson, Lawrence, Pulaski, and Wabash 

 counties. Aug.-Oct. 



9. Kuhnia L. — False Boneset 

 K. eupatorioides L. Prairie soil, often along roads, common. Aug.- 

 Oct. [K. suaveolens Fresen.]. 



10. Liatris Schreb. — Blazing Star 

 1. Pappus evidently plumose; heads few, racemose, cylindrical, 15- 

 to 60-flowered, 1.5-2 cm high. 

 2. Heads with 10-60 flowers; corolla-lobes hairy within. 



3. Stems and leaves glabrous or nearly so; bracts glabrous on 

 the back, thin, appressed; roadsides, prairie soil, or on 

 hillsides, nearly throughout 111., except the most southerly 



counties. Aug.-Sept L. cylindracea Michx. 



3. Stems and leaves pubescent; bracts pubescent, lanceolate, 

 acuminate, firm, rigid, more or less squarrose; dry soil, s. 



111. [L. hirsuta Rydb.] L. squarrosa (L.) Michx. 



2. Heads with 4-6 flowers; corolla glabrous; adv. from the West; 

 Du Page Co L. punctata Hook. 



