SS COMPOSITAE. 



H- giganteus L. Roots fleshy, rootstock creeping: stems hispid or scab- 

 rous, 3-10 feet high, simple or branched above; leaves sessile or short- 

 petiolcd, lanceolate, scabrous above, hirsute beneath, denticulate or serrate, 

 mostly ill teroate but sometimes opposite; heads several, long-peduucled; in- 

 volucre hemispheric, the brarcts lanceolate-subulate, ciliate or hirsute, squar- 

 rose. Reported as rare from Fayette couDty. 



H- maximiliana Sehrad. Stem 2-8 feet high, stout, hispidulous-seabrous: 

 leaves alternate, some opposite, narrowly lanceolate, tapering both ways, 

 subsessile', entire or nearly so, very scabrous oi> both sides; heads over medium 

 size, terminating the stem or branches: scales long-attenuate; rays golden 

 yellow. Prairies; August-September: infrequent; Emmet and Dubuque 

 eounties, reported from Flcyd, Story, liuena Vista. Monona, Woodbury, 

 Sioux, Lyon, and Dickinson counties. 



f! § Stem glabrous, tjlmttxiw*. leurcx petioleth 



H- grosse-serratus Martens. Stem snsootb, glaucous, 3-8 feet high, 

 mostly simple; leaves opposite; petioled, long-lanceolate, long-pointed, 

 sharply serrulate or denticulate, whiter and pubescent beneath: scales subu- 

 late; heads many, small, short-peduncled; rays Ifi-JO. Low grounds; August- 

 September; common. 



t I" Leinvm uviitr, onitc-lmnxohite, or oblomj. 

 | Leaven xexxlle, or nearly no. 



Y\. mollis Lam. Stem 2-3 feet high, simple, hirsute: leaves ovate to lan- 

 ceolate, acute or acuminate. 3-nerved, base cordate-clasping; heads few or 

 solitary; involucre hemispheric, the bracts lanceolate, acuminate, villous- 

 canescent, slightly spreading. Dry soil; August-September; reported as be- 

 longing to the flora of Iowa. 



Y\. divaricatus L. Stem 2-7 feet high, glabrous or pubescent above; 

 leaves usually opposite, divaricate, lanceolate or ovate-lanceolate, dentate or 

 denticulate, rough above, pubescent beneath, apex long-acuminate, base 

 truncate; scales narrowly lanceolate, hirsute or ciliate. Dry woodlands; 

 July-September; specimens from Winneshiek, Fayette, and Henry counties 

 have been referred to this species. 



X % Leave* petioled. 

 'i Stem* ijhthroiix or pnhcntli-nt. 



H- decapetalus L. Stem 1-5 feet high, slender, glabrous or nearly so, 

 branches puberulent; leaves thin, ovate or ovate-lanceolate, sharply serrate, 

 roughish above, more or less finely pubescent beneath, the lower opposite, 

 slender petioled. the upper alternate, apex acuminate, base rounded or trun- 

 cate and decurrent on the petiole; scales linear-lanceolate, acuminate, hir- 

 sute, ciliate, spreading. Moist woods; August-September: specimens from 

 Floyd county have been referred to this species. 



H- tracheliifolius Mill. Stem 3-(i feet high, roughish-pubescent; leaves 

 ovate-lanceolate, short-petioled, 3-nerved at the base, green on both sides, 

 rougher above, lower sharply serrate; scales linear-lanceolate, long-acumi- 

 nate, puberulent, ciliate, larger than the disk, sometimes foliaceous. Uor- 

 dei's; August-September; infrequent. Specimens from fayette, Johnson, and 

 Story counties are referred to this species. 



|-|. strumosus L. Ro..tstock long and slender; stem 3-ii feet high, usually 

 branching, smooth, often- glaucous, the branches rarely hispidiilous; leaves 

 ovate-lanceolate, acuminate, abruptly contracted or taperinf into mar- 

 gined petioles, entire or slightly serrate, rough above, whiter and often 



