262 American Midland Naturalist Monograph No. 2 



1 1 . Leaves ovate-lanceolate, thin, conspicuously coarsely reg- 

 ularly serrate-dentate, the lower surface glabrous, sca- 

 brous, or puberulent; dry woods, local. July-Oct 



H. decapetalus L. 



10. Leaves 1 -veined or inconspicuously 3 -veined, the upper alter- 

 nate, remotely denticulate or nearly entire, the lower ones 

 opposite, coarsely serrate, all elongate-lanceolate, acumi- 

 nate, scabrous above, finely shortly whitish pubescent 

 beneath; peduncles strigose; stem 2-4 m. tall; prairie soil, 

 roadsides, borders of fields, common. Aug. -Oct. [H. m- 



stahilis E. E. Wats.] H. grosseserratus Martens 



9. Stem scabrous or hispidulous; leaves triple-veined from near the 

 base, chiefly opposite below the inflorescence. 

 12. Lower surface of leaves hispidulous or short-hirsute; stem 



hirsute; roadsides and fields, local. Aug. -Sept 



H. hirsutiis Raf. 



12. Lower surface of leaves rather copiously canescent-puberu- 

 lent; stem hirsutulous or antrorsely scabrous-strigilose; 

 rhizome short, often tuberous-thickened at apex; alluvial 

 soil, common. July-Oct. [H. subcanescens (Gray) E. E. 

 Wats.; H. mollissimus E. E. Wats.} Jerusalem Artichoke 



H. tuberosus L. 



1. Plants annual; leaves chiefly alternate; disk usually brownish purple; stem 

 hispid or strigose. 



13. Leaves lanceolate, usually entire; stem 30-90 cm. tall; disk 1.5 cm. broad; 

 bracts lanceolate, densely scabrous; sandy soil, roadsides, waste places, 



occasional; probably adv. from w. U.S. Aug. -Sept 



H. petiolaris Nutt. 



13. Leaves ovate, dentate; stem 1-4 m. ta'l; disk 2.5-4 cm. broad; bracts 

 ovate-lanceolate, ciliate and hispid; fields and roadsides, and often 

 cult.; native w. of the Mississippi R. Aug. -Sept. Garden Sunflower .... 

 H. annnus L. 



30. Actinomeris Nutt. 



A. alternijolia (L.) DC. Yellow Ironweed. Alluvial soil and along roads, 

 common. July-Sept. \^Verbesina alternijolia (L.) Britt.} 



31. Verbesina L. 



V. helianthoidei Michx. Open woods and along roads, throughout 111., 

 except the n. counties. June-July. 



32. Coreopsis L. 



1. Leaves simple, entire or palmately cleft or divided; achenes wing-margined; 

 plants perennial. 

 2. Leaves entire, or rarely with 1 or 2 lateral lobes. 



3. Leaves mostly near the base of the stem; heads long-peduncled. 



