3io 



COMPOSITAE. 



[Vol. III. 





ii. Eupatorium sessilifolium L,. Up- 

 land or Bastard Boneset. (Fig. 3623.) 



Eupatorium sessilifolium L- Sp. PI. 837. 1753. 



Glabrous throughout, or pubescent above, 

 branched near the summit, 2-6 high. Leaves 

 opposite, or the lower rarely in 3's, closely ses- 

 sile, lanceolate or ovate-lanceolate, long-acumi- 

 nate, thin, sharply serrate, 3'-6' long, Yz'-xYz' 

 wide, inflorescence cymose-paniculate; heads 

 4 // ~5 // high, about 5-flowered; involucre cam- 

 panulate, its bracts linear-oblong, imbricated in 

 about 3 series, the inner obtuse, the outer acut- 

 ish, shorter; flowers white. 



In dry woods, Massachusetts to Pennsylvania, 

 Illinois and Alabama. Aug.-Oct. 



Eupatorium sessilifolium Brittonianum Porter, 



Bull. Torn Club, 19: 129. 1892. 

 Leaves ovate or oblong-ovate, sparingly and finely 

 serrate, firm, rounded at the base, acute, the upper 

 i'-2' long, 6"-g" wide, pinnately veined, dark 

 green; cymes dense, their branches puberulent. 

 Budd's Lake, N. J. Perhaps a distinct species. 



10. Eupatorium altissimum L. 

 Tall Thoroughwort. (Fig. 3622.) 

 Eupatorium altissimum L. Sp. PI. 837. 1753. 



Densely and finely pubescent, corym- 

 bosely much-branched above, 4-8 high. 

 Leaves lanceolate, acuminate at the apex, 

 tapering below into a short petiole, rough- 

 ish, rather thick, sparingly dentate above 

 the middle.or some of them entire.strongly 

 3-ribbed, 2 / ~5 / long, 5 // -i2 // wide; inflor- 

 escence densely cymose-paniculate; heads 

 about 5-flowered, 3 // ~4 // high; involucre 

 campanulate, its bracts oblong, obtuse, or 

 truncate, densely pubescent, imbricated 

 in about 3 series, the outer shorter; flow- 

 ers white. 



In dry open places, Pennsylvania to North 

 Carolina and Alabama, west to Iowa, Ne- 

 braska and Texas. Sept.-Oct. 





12. Eupatorium verbenaefolium 

 Michx. Rough or Vervain Thorough- 

 wort. (Fig. 3624.) 



EupatoriumpilosumWa.lt. Fl. Car. 199. 17S8. ? 

 Eupatorium verbenaefolium Michx. Fl. Bor. 



Am. 2: 98. 1803. 

 E. teucrufolium Willd. Sp. PI. 3: 1753. 1804. 



Rough-pubescent, slender, 3-S high, 

 branched at the summit. Leaves opposite, 

 or occasionally in 3's, ovate-oblong, usually 

 obtuse or blunt-pointed, closely sessile or 

 rarely short-petioled, rounded at the base, 

 more or less crenate-dentate, 2 / ~4 / long, ^ / - 

 i / wide, the upper pairs distant and small; in- 

 florescence cymose-paniculate; heads 5-flow- 

 ered, about 3 // high; involucre campanulate, 

 its bracts liuear-lauceolate, acute, imbricated 

 in about 3 series, densely pubescent, the 

 outer shorter; flowers white. 



In moist soil, Massachusetts to Pennsylvania, 

 south to Florida and Louisiana. Called also 

 Wild Hoarhound. Julv-Sept. 



