COMPOSITAE. 



VOL. III. 



19. Eupatorium aromaticum L. Smaller 

 White Snake-root. Fig. 4170. 



Eupatorium arcmaticum L. Sp. PI. 839. 1753. 



Puberulent or glabrate, slender, branched at 

 the summit, i-2 high. Leaves opposite, peti- 

 oled, firm, obtuse or acutish at the apex, round- 

 ed, cordate or sometimes narrowed at the base, 

 crenate-dentate, 1^-3' long, g"-i8" wide, 3- 

 nerved and veiny; petioles 2"-8" long; in- 

 florescence usually compact; heads io--25-flow- 

 ered;^ receptacle flat; involucre campanulate, 

 ii"-2" high, its bracts linear, generally obtuse, 

 in i or 2 series; flowers white. 



In dry soil, Massachusetts to Florida, Pennsyl- 

 vania, West Virginia, Tennessee and Mississippi. 

 Blooms _ rather later than the preceding species 

 where the two grow together, near New York. 

 Called also poolroot, poolwort, and wild hoar- 

 hound. Aug.-Oct. 



20. Eupatorium incarnatum Walt. 



Pink Thoroughwort. Fig. 4171. 

 E. incarnatum Walt. Fl. Car. 200. 1788. 



Minutely pubescent, 2-4 high, some- 

 times reclining, often diffusely branched. 

 Leaves opposite, deltoid-ovate, \'-2\' 

 long, long-pointed, rather coarsely blunt- 

 serrate or crenate-serrate, truncate or 

 cordate at the base, the petioles slender, 

 often as long as the blades; heads about 

 20-flowered ; involucres campanulate, 

 about 2" high, its bracts few, narrowly 

 linear, slightly ribbed when dry, acute; 

 corolla pink or pale purple. 



In woods and sandy soil, Virginia to Mis- 

 souri, Florida and Mexico. Aug.-Oct. 



21. Eupatorium coelestinum L. Mist- 

 flower. Blue Boneset. Fig. 4172. 



Eupatorium coelestinum L. Sp. PI. 838. 1753. 

 Conoclinium coelestinum DC. Prodr. 5 : 135. 1836. 



Pubescent or puberulent, branched, i-3 

 high. Leaves opposite, petioled, ovate, obtuse 

 or acute at the apex, truncate at the base, or 

 abruptly contracted into the petiole, crenate- 

 dentate, li'-3' long, 9"-i8" wide; inflorescence 

 cymose-corymbose, rather compact ; heads 2"- 

 3" high; involucre broadly campanulate, its 

 bracts linear-lanceolate, acuminate, equal or 

 nearly so, in I or 2 series ; receptacle conic ; 

 flowers blue or violet. 



In moist soil, New Jersey to Florida, Illinois, 

 Michigan, Kansas, Arkansas and Texas. Also in 

 Cuba. Aug.-Oct. 



5. MIKANIA Willd. Sp. PL 3 : 1742. 1804. 



[WILLUGHBAEA Neck. Elem. i : 82. Hyponym. 1790.] 



Herbaceous twining vines, or some tropical species erect shrubs, with opposite, petioled 

 leaves, and discoid, mostly cymose-paniculate heads of whitish flowers. Heads 4-flowered. 

 Involucre oblong, of 4 slightly unequal narrow bracts. Receptacle small, naked. Corolla 



