COMPOSITiE. (COMPOSITK FAMILY.) 241 



= = Leaves opposite, clasping or united at the base, long, widcli/ spreading ; 

 heads vwstli] \Q -lii-Jlotcered ; corijmbs very compound and large. 



12. E. perfoli^tuni, L. (Thokoughwout. Boneskt.) Stem stout 

 (2-4° liigli), hairi/ ; leaves lanceolate, united at the base around the stem (coriuate- 

 perfoliate), tapering to a slender point, serrate, very veiny, wrinkled, downy 

 beneath (5 - 8' lone;) ; scales of the involucre linear-lanceolate. — Low grounds ; 

 common and well-known. — Varies with the heads 30 - 40-flowered, or with 

 some or all of the leaves separateil and truncate at base. 



Var. cuneatum, Kngelm. Leaves smaller, narrowed at base and separate, 

 and heads fowcr-tlowered. Terhaps a hybrid with n. 7. — Mo. and southward. 



1-3. E. resin6sum, Torr. Minutelg velvet 1/ -down)/ {2-3° high); leaves 

 linear-lanceolate, elongated, Semite, partl/j clasping, tapering t<j the point, slightly 

 veiny beneath (4-6' long); scales of the involucre oval, obtuse. — Wet pine 

 barrens, N. J. — Name from the copious resinous globules of the leaves. 

 * * * Heads 8 - 30-Jloivered ; mvolucral sccdes nearlij equal, in one row; leaves 

 opposite, ovate, petioled, triple-nerved, not resinous-dotted ; Jiovcers white. 



14. E. ageratoides, L. (White Sxake-root.) Smooth, bmnching (3° 

 high) ; leaves broadlg ovate, pointed, coarsely and sharplg toothed, long-petioled, 

 thin (3 -.5' long) ; corymbs compound. — Rich woods; common northward. 



15. E. aromaticum, L. Smooth or slightly downy ; stems nearly sim- 

 ple ; leaves on short petioles, ovate, rather ohtuselij toothed, not pointed, thickish. — 

 Coj)ses, Mass. to Va., and southward, near the coast. — Lower and more slender 

 than u. 14, with fewer, but usually larger heads; not aromatic. 



§ 2. CONOCLfNIUM. Receptacle conical; involucral scales nearly erpial, 

 somewhat imbricated. 



16. E. CCBlestinum, L. (Mist-flower.) Somewhat pubescent (I -2° 

 high) ; leaves opposite, petiolate, triangular-ovate and slightly heart-shaped, 

 coarsely and bluntly toothed ; heads many-flowered, in compact cymes ; flowers 

 blue or violet, (Conodiuiura coelestinum, DC.) — Rich soil, N. J. to Mich., 

 111., and southward. Sept. 



6. KIJHNIA, L. 



Heads discoid, 10-25-flowered ; flowers perfect. Involucral scales thin, 

 few and loosely imbricated, narrow, striate-nerved. Corolla slender, 5-toothed. 

 Aciienes cylindrical, 10-striate; pappus a single row of very plumo.se (white) 

 bristles. — A perennial herb, resinous-dcjtted, with m(jstly alternate leaves, and 

 paniculate-corymbose heads of cream-colored flowers. (Dedicated to Dr. Kuhn, 

 of Penn.sylvania, who carried the living plant to Linnivus.) 



1. K. eupatorioides, L. Stems 2-3° higli ; pubescence miimte; leaves 

 varying from broadly lanceolate and toothed, to linear and entire. — Dry soil, 

 N. J. to Minn., E. Kan., and southward. Sept. Very variable. — Var. corym- 

 bul6sa, Torr. & Gray, is a western form, stouter and somewhat nwre })ubes- 

 cent, the heads rather crowded. 



7. BRICKELLIA, Ell. 



Characters as in Kuhnia; involucral scales more numerous, and the bristles 

 of the pappus merely .scabrous or at the most barbcllate or subpluniose ; leaves 



1(5 



