312 



COMPOSITAE. 



[\'0L. III. 



17. Eupatorium ageratoides 1,. f. 



White Snake-root. White Sanicle. 



Deerwort Boneset. (Fig. 3629.) 



£■. agerafoidcs h. f. Suppl. 355. 1781. 



Glabrous or nearly so, much branched, 

 l°-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 |^'-2j<' long; inflorescence 

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

 receptacle flat; involucre narrowly cam- 

 panulate, about 2" high, its bracts linear, 

 acute or acuminate, in i or 2 series, equal 

 or uearlj" so; flowers bright white. 



In rich woods, Neiv Brunswick to western 

 Georgia, Ontario, Nebraska, the Indian Terri- 

 tory and Louisiana. Indian Sanicle. July-Nov. 



y 



Eupatorium perfoliatum cuneatum ( Engel. ) .\.Gray, 

 loc. cit. loo, with leaves smaller, narrowed and sejja- 

 rated at the base, occurrinft in .Arkansas and Mis- 

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

 serotinnm. 



16. Eupatorium resinosum Torr. 

 Resin Boneset. (Fig. 3628.) 



E. resinosum Torr. DC. Prodr. $: 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 conuate-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. S39. 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, crcnate-dentate, !%'-■■,' long, 9"-iS" wide, 

 3-ncrved and veiny; petioles 2"-S" long; inflor- 

 escence usually compact; heads io-25-flowered; 

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

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

 2 series; flowers white. 



In dry soil, llassachusetts to Florida. Blooms 

 rather later than the preceding species where the 

 two grow together. Called also Poolroot, Poolwort, 

 and Wild Hoarhound. .\ug.-Oct, 



