784 COMPOS IT A E (rOMI'osiTK I AM II, Y) 



* * * Heads S-3Q-Jlowercd ; invoiucral bracts nearly equal, in one row or hut a 

 very few of the outermost shorter ; leaves opposite, ovate, petioled, triple- 

 nerved, not resinous-dotted. 



<- Leaves broadly ovate; flowers pure white. 



16. E. urticaef61ium Reiehard. (WHITE SNAKBKOOT.) Smooth, branching, 

 0.5-1 in. high ; leaves broadly ovate, pointed, coarsely and sharply toothed, long- 

 petioled, thin, 7-12 cm. long; corymbs compound. (E. ageratoides L. f.) 

 Rich woods, not rare. Var. VILLICAULE Fernald. Stems and petioles viscid- 

 vinous. Pa. (Heller} to Va. (Curtiss}. 



17. E. aromaticum L. Smooth or slightly downy ; stems nearly simple ; 

 leaves on short petioles, ovate, rather obtusely toothed, not pointed, thickish. 

 Copses, etc., Mass, to Fla., near the coast. Not aromatic. 



*- *- Leaves deltoid-ovate ; flowers pink to pale purple. 



18. E. incarnatum Walt. Freely branched, 6-12 dm. high, puberulent ; 

 brandies spreading-ascending ; leaves rather narrowly deltoid-ovate, Jong-pointed, 

 coarsely crenate-serrate or bluntly toothed ; slender petioles mostly 1-4 cm. 

 long. Va. (Mackenzie} and Ky. to Fla. and Tex. 



2. CONOCLfNIUM (DC.) Baker. Receptacle conical; invoiucral bracts 



nearly equal, somewhat imbricated. 

 



19. E. coelestinum L. (MIST-FLOWER.) Somewhat pubescent, 0.3-1 m. 

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

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

 blue or violet. Rich soil, N. J. to Mich., Kan., and south w. 



5. MIKANIA Willd. CLIMBING HEMP-WEED 



Heads discoid, 4-flowered. Involucre of 4 bracts. Receptacle small. Flow- 

 ers, achenes, etc., as in Eupatorium. Twining perennials, with opposite com- 

 monly heart-shaped and petioled leaves, and corymbose-panicled flesh-colored 

 flowers. (Named for Joseph Gottfried Mikan, 1743-1814, professor in the 

 University of Prague.) WILT.UGBAEYA Neck. 



1. M. scandens (L.) Willd. Nearly smooth ; leaves somewhat triangular- 

 heart-shaped or halberd-form, pointed, toothed at the base. (WUlougKbva 

 Ktze.) Copses along streams, and in sandy swamps, s. Me. to Fla., chiefly 

 near the coast, w. to Ont., and s. to Miss, and Tex. July-Sept. 



6. TRiLISA Cass. 



Heads discoid, 6-10-flowered ; flowers perfect. Invoiucral bracts nearly 

 equal, little imbricated. Receptacle naked. Corolla-lobes short-ovate or oblong. 

 Achenes 10-ribbed ; pappus of rather rigid bristles, not plumose. Perennial 

 herbs, fibrous-rooted, with broad entire leaves, obscurely or not at all punctate, 

 and cymules of small heads in a thyrse or panicle. Flowers rose-purple, in 

 autumn. (Name an anagram of Liatris.} 



1. T. paniculata (Walt.) Cass. Viscid-hairy; leaves narrowly oblong or 

 lanceolate, smoothish, those of the stem partly clasping ; heads panicled. Low 

 pine barrens, Va., and southw. 



2. T. odoratfssima (Walt.) Cass. Very smooth; leaves obovate-spatulate, 

 pale ; heads c<>rt/inf-<l ; plant with the odor of vanilla when bruised. S. C. to 

 Fla., and said to reach our limits in s. Va. 



7. BRICKELLIA Ell. 



Characters as in Kuhnia ; invoiucral bracts more numerous. Bristles of the 

 pappus merely scabrous or at most barbellate or subplumose. Leaves often all 

 opposite. (In memory of Dr. John Brickell of Savannah, Ga., amateur botanist 



