256 coMi'OrfiT^. (composite family.) 



* « Disk convex, ycUotv : scales of (he involucre rerjularlij imbricated and oppressed, 

 with somewhat spreadinrj and acute {hut not/oliaccous) tips : Icucis ckicfly opposite. 



5. H. l8Btifl6ruS, Tcrs. Stout and romjh (3° -4° high), branching above: 

 leaves oval-lam-iuldtc, verij rourjh both sides, narrowed into short petioles, serrate, taper- 

 pointed, the upi)erniost alternate and nearly entire ; licads single or corymbcd, 

 on naked ])eiluneles ; scales of the involucre ovate-lanceolate, pointed, ciliatc. — 

 Dry open places, Ohio to Illinois, and southward. — Leaves almost as thick as 

 in 11. ri;iiilus. Kays showy. l'-2' long. 



6. H. OCCident^Iis, Kiddcll. Somewhat hairy; stem s/c«t/r';-,s/;«;)/<', Wa J 

 above (l°-3° high, sending out runners from the base), bearing 1-5 small 

 heads on long jjeduncles ; lowest leaves oval or lanceulate-ovate, 3-nerved, obscurely 

 serrate, romjhish-ptibescmt beneath, abruptly contracted into lony hairy petioles ; the 

 upper small and remote, entire ; scales of the involucre oval-lanceolate, pointed, 

 ciliate. — Dry barrens, Ohio to Wisconsin, Kentucky, and southward. 



7. H. cinereUS, var. SuUivantii, Torr. & Gr. Gray with a close rouijh- 

 ish pubescence ; stem branching above, hairy ; leaves ovate-oblomj , sessile bi/ a nar- 

 rowed base, acute, obscurely serrate ; the upper small and remote ; peduncles 

 slender ; scales of the involucre lanceolate, hoary. — Darby Plains, Ohio, SuUi- 

 vant. Stem 2° -3° high, bearing few heads, as large as those of the next. 



8. H. mollis, Lam. Stem clothed with soft white hairs, simple, Uafy, to 

 the top (2° -4° higii) ; leaves ovate, with a broad heart-shaped and clasping base, 

 pointed, nearly entire, hoary above, very soft ivhite-ivoolly and reticulated under- 

 neath ; scales of the involucre lanceolate, downy. — Barrens iind Prairies, Ohio 

 to Illinois, and westward. 



* * * Heads very S7nall {about 4" broad) : scales of the involucre fetv, shorter than the 



yellow disk, irrerfulurly imbriculed, oppressed, the outer with spreading foUuceous 

 pointed tips : rays 5-8, slender : leaves all but the uppermost opposite. 



9. H. mierocephalus, Torr. & Gr. Stem smooth {i°-^° high), with 

 numerous slender branches above ; haves thin, ovate-lanceolate, taperjiointed, 

 somewhat serrate, veiny, petioled, rough above, downy or hairy undernnith ; pe- 

 duncles slender, rough ; scales of the involucre ovate and ovate-lanceolate, 

 ciliate. — Thickets, Pennsylvania to Illinois, and southward. * 



10. H. Isevig^tus, Ton-. & Gr. Stem slender (l°-4° high), simple or 

 sparingly branched, very smooth and glabrous throughout, as well as the slightly 

 terrate lanceolate leaves. — Dry soil, Alleghany Mountains, west of the Warm 

 Springs of Virginia, and southward. 



* # * * Heads middle-sized or large : scales of the im^olucre irregularly imhrimtaf, 



loose, with spreading foliaceous tips, as long as the yrllvw disk or longir. 

 •*- Leaves chiefly alternate or scattered, feather-veined, somrtimes obscurely triph-rihhed. 



11. H. giganteUS, L. Stem hairy or rough (3" -10° high), branched 

 above; Irarrs lunnoldti', pointed, serrate, very rough above, rough-liairy hewalh, 

 narrowed and ciliate at the I)asc, but nearly sessile ; scales of the involucre long, 

 linear-lanceolate, pointed, hairy, or strongly ciliate. — Var. .VMnfouus has most 

 of the leaves opposite and clo.se]y sessile by an obtuse base, and approaches No. 

 14. — Low thickets and swamps : common. Heads somewhat corymbed : the 

 pale yellow rays 1 5 - 20. 



