312 



COMPOSITAE. 



[Vol. III. 



17. Eupatorium ageratoides L. f. 



White Snake-root. White Sanicle. 



Deerwort Boneset. (Fig. 3629.) 

 E. ageratoides L. f. Suppl. 355. 1781. 



Glabrous or nearly so, much branched, 

 i-4 high. Leaves opposite, thin, acu- 

 minate at apex, rounded, truncate or cor- 

 date at the base, or abruptly narrowed into 

 the slender petiole, coarsely and usually 

 sharply dentate-serrate, sometimes cre- 

 nate, 3 / -6 / long, i / ~3 / wide, 3-nerved and 

 veiny; petioles % , -2yi / long; inflorescence 

 rather loose, ample; heads 10-30- flowered; 

 receptacle flat; involucre narrowly cam- 

 panulate, about 1" high, its bracts linear, 

 acute or acuminate, in 1 or 2 series, equal 

 or nearly so; flowers bright white. 



In rich woods, New Brunswick to western 

 Georgia, Ontario, Nebraska, the Indian Terri- 

 tory and Louisiana. Indian Sanicle. July-Nov. 



Eupatorium perfoliatum cuneatum ( Engel. ) A.Gray, 

 loc. cit. 100, with leaves smaller, narrowed and sepa- 

 rated at the base, occurring in Arkansas and Mis- 

 souri, is regarded by collectors as a hybrid with E. 

 serotinum. 



16. Eupatorium resinosum Torr. 

 Resin Boneset. (Fig. 3628.) 

 E. resinosum Torr. DC. Prodr. 5: 176. 1836. 



Slender, resinous-pubescent, 2-3 high, 

 branched at the summit, the inflorescence com- 

 paratively small, 3 / -4 / broad. Leaves opposite, 

 closely sessile, clasping, or slightly connate-per- 

 foliate at the base, linear-lanceolate, long-acu- 

 minate, sharply serrate, 3 / -6 / long, 3 // -6 // wide, 

 roughish above, canescent beneath; heads 10- 

 15-flowered; involucre campanulate, about 2" 

 high, its bracts oblong, obtuse, imbricated in 2 

 or 3 series, the outer shorter; flowers white. 



In wet places, pine-barrens of New Jersey. Aug.- 

 Sept. 



18. Eupatorium aromaticum L,. 



Smaller White Snake-root. 



(Fig. 3630.) 



Eupatorium aromaticum L,- Sp. PI. 839. 1753. 



Puberulent or glabrate, slender, branched 

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

 petioled, firm, obtuse or acutish at the apex, 

 rounded, cordate or sometimes narrowed at the 

 base, crenate-dentate, 1 ^'-3' long, o/'-i 8" wide, 

 3-nerved and veiny; petioles 2 // -8 // long; inflor- 

 escence usually compact; heads 10-25-flowered; 

 receptacle flat; involucre campanulate, i / ^ // -2 // 

 high, its bracts linear, generally obtuse, in 1 or 

 2 series; flowers white. 



In dry soil, Massachusetts to Florida. Blooms 

 rather later than the preceding species where the 

 two grow together. Called also Poolroot, Poolwort, 

 and Wild Hoarhound. Aug.-Oct. 



