COMPOSITAE (COMPOSITE FAMILY) 835 



<-■!-+ leaves narrow, the uppermost alternate, not 3-nerved, scabrous both 



sides; heads rather small ; bracts loose, attenuate. 



■>-^ Stem smooth and glaucous, 



12. H. KellermUni Britton. Slender, leafy, paniculately branched above ; 

 leaves narrowly lance-linear to linear, attenuate to the apex and subsessile base, 

 cliiefly alternate, green both sides, somewhat scabrous, finely and sparingly 

 serrate ; heads numerous, 3-4.5 cm. wide ; involucral bracts lanoe-linear, sub- 

 equal, about 1 cm. long; rays golden-yellow, 1-2 cm. long. — Near Columbus, 

 O. (Kellerman). 



I'j. H. grosseserrHtus Martens. Stem 2-3 m. high ; leaves elongated-lanceo- 

 late or ovate-lanceolate, taper-pointed, sharply serrate or denticulate, acute or 

 attenuate at base, petioled, often whiter and finely pubescent beneath ; bracts 

 lanoe-awl-shaped, slightly ciliate. — Dry plains, w. Me. to N. J., westw. to Ont., 

 Dak., and Tex. — Probably runs into the next. 



++ ++ Stem hairy or scabrous, 



14. H. gigantSus L. Stem 0.5-3 m. high, branched above ; leaves lanceolate, 

 pointed, minutely serrate or nearly entire, green both sides, narrowed and ciliate 

 at base, but nearly sessile ; bracts long, linear-lanceolate, pointed, hairy oi 

 strongly ciliate. {H, Dalyi Britton ?) — Low thickets and swamps, w. N. E, 

 to Ont., westw. and southw. — Heads somewhat corymbed ; the pale yellow rays 

 15- -20; roots often becoming tuber-like, especially in var. subtuber6sds (Bour- 

 geau) Britton which has mostly opposite leaves, and occurs from n. Mich, 

 northwestw. 



15. H. Maximili&ni Schrad. Resembling the preceding ; stout, often simple, 

 0.5-3 m. high ; leaves becoming rigid and very scabrous, entire or sparingly den- 

 ticulate ; heads rather large, usually short-pedunoled, terminal and in the upper 

 axils ; bracts longer-attenuate, more rigid. — Prairies, Minn, and the Saskatche- 

 wan to Tex. ; occasionally adventive eastw. 



1- -I- 1- ^- Leaves all or most of them opposite, 3-nerved (faintly in no. 17). 



*+ Heads very small (about 8 mm. broad); rays 5-8 ; bracts few, short, irregu- 

 larly imbricated, the outer with spreading foliaceous pointed tips ; stems 

 smpoth. 



16. H. microcSphalus T. & G. Stem 1-2 m. high, with numerous slender 

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

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

 bracts ovate and ovate-lanceolate, ciliate. (H, parviflorus Bernh., not HBK.) 

 — Thickets, etc.. Pa. and "s. Mich." to Mo., and southw. 



17. H. laevigHtus T. & G. Stem slender, 0.5-2 m. high, simple or sparingly 

 branched, glaiucous, glabrous throughout, as well as the slightly serrate lanceo- 

 late leaves which are usually narrow and attenuate to the base. — Dry soil, 

 Allegheny Mts., Va., and southw. 



■w- ++ Heads larger; rays usually over.W; spreading by creeping rootstocks, 



= Leaves sessile or subsessile to short-petiolate, serrulate or entire. 



18. H. doronicoides Lam. Finely pubescent and roughish, 1-3 m. high ; 

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

 serrulate; bracts loose, attenuate, mostly 1-1.5 cm. long, hairy. —Dry ground, 

 O. to Mo. 



19. H. divaric&tus L. Stem simple or forked and corymbed at the top, 0.5- 

 2 m. high, smooth below ; leaves all opposite and divaricate, ovate-lanceolate, 

 3-nerved from the rounded or truncate sessile base, tapering gradually to a sharp 

 point, 0.5-2 dm. long, serrate, thicldsh, rough both sides; bracts narrowly 

 lanceolate, attenuate, ciliate, equaling the disk (1 cm. wide) ; rays 8-12, 2.5 cm. 

 long. — Thickets and barrens, s. Me. to L. Winnipeg, Neb., and southw. 



20. H. hlrsAtus Raf. Stem simple or forked above, stout, 0.5-1 m. high, 

 bristly-hairy; leaves all short-petioled, ovate-lanceolate, gradually pointed, 

 slightly serrate, rounded QX obtuse at the base, very rough above, usually rough 



