COMPOSITE. (COMPOSITK FAMILY. ) 270 



* * * Involucre looser, the scales more ciruminate or elongated or foUaceous ; 



disk i/elloiv (anthers dark). 



•<- leaves all opposite, sessile, serrulate; pubescence rather soft. 



9. H. mollis, Lam. Stem simple, leafy to the top (2-3° high) ; leaves 

 ovate to lanceolate, with broad cordate clasping base, jxjintcd ; scales lanceo- 

 late, seldom exceeding the disk. — Dry barrens, Ohio to Iowa and southward, 

 -t- H- Leaves mostli/ alternate and 3-nerced, soft-pubescent beneath, scabrous above ; 



scales verji long and loose, hairy ; tips of chaff and corolla4obes hirsute. 



10. H. tomentbsus, Michx. Stem hairy, stout (4-8° high); leaves 

 oblong-lanceolate, or the lowest ovate, tapering at both ends, obscurely serrate, 

 large (.5-12' long), somewhat petioled ; disk 1' broad ; rays 12-16, about 1' 

 long. — Rich woods, 111. (?), Va., and southward along the mountains. 



-»- -t- 4- Leaves narrow, chief 1/ alternate, not 3-nerved, scabrous both sides ; heads 

 rather small ; scales loose, attenuate. 



11. H. gr6sse-serr^tus, Martens. Stem smooth and glaucous, 6-10"^ 

 high; leaves elongated-lanceolate or ovate-lauceolate, taper-pointed, sharply 

 serrate or denticulate, acute or attenuate at base, petioled, often whiter and 

 finely pubescent beneath; scales lance-awl-shaped, slightly ciliate. — Dry 

 plains, Oliio to Dak., INIo., and southwestward. — Probably ruus into the 

 next. 



12. H. gigant^US, L. Stem hairi/ or rough (3-10^ I'ifflO, branched 

 above; leaves lanceolate, pointed, minutely serrate or nearly entire, green both 

 sides, narrowed and ciliate at base, but nearly sessile ; scales long, linear-lan- 

 ceolate, pointed, hairy or strongly ciliate. — Var. AMBfouLS, Torr. & Gray; 

 leaves mostly opposite and closely sessile by an obtuse base; perhaps a hybrid 

 with n. 17. — Low thickets and swamps ; common. Heads somewhat corymbed ; 

 the pale yellow rays 15-20; roots often becoming tuber-like. 



13. H. Maximiliani, Schrad. Resembling the last ; stout, often simple, 

 1-10° high ; leaves becoming rigid and very scabrous, entire or sparingly den- 

 ticulate ; heads rather large, usually short-peduucled, terminal aud in the up])er 

 axils; scales longer attenuate, more rigid. — Prairies, Minn, to Tex. 



■»-■«--•--•- Leaves all or most of them opposite, 3-nerved {faintly in n. 15). 

 ■•-*■ Heads very small (about 4" broad) ; rays 5-8; scales few, short, iiregularly 

 imbricated, the outer with spreading fuliaceous pointed tijis; stems smooth. 



14. H. parvifl6rus, Beruh. Stem 3-6° high, with numerous slender 

 branches above ; leaves thin, ovate-lanceolate, taper-pointed, somewhat serrate, 

 petioled, rough above, pale and puberulent beneath ; peduncles slender, rough ; 

 scales ovate aud ovate-lanceolate, ciliate. (H. microcephalus, Torr. tj- Clray.) 

 — Tliickcts, Penn. to 111., and southward. 



15. H. laevigatas, Torr. & Gray. Stem slender (1 -G"^ high), simple or 

 sparingly branched, glaucous, glabrous throughout, as well as the slightly ser- 

 rate lanceolate leaves which are usually narrow and attenuate to the base. — 

 Dry soil, Alleghany Mts., and southward. 



•*-<• ■*-*■ Iliads larger; rays usually over 10; spreading by creeping rootstocks. 

 = Leaves sessile or sub.'iessile to short-petiolate, serrulate or entire. 



16. H. doroniCOides, Lam. Finely pubescent and roughish, 3-7° 

 high ; leaves sessile, ovate-oblong, acute, triply-nerved above the broadly cuneate 



