360 



COMPOSITAE. 



VOL. III. 



13. Eupatorium verbenaefolium Michx. Rough or Vervain Thoroughwort. 



Fig. 4164. 



Eupatorium pilosum Walt. Fl. Car. 199. 1788. ? 

 Eupatorium verbenaefolium Michx. Fl. Bor. 



Am. 2 : 98. 1803. 



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

 E. verbenaefolium Saundersi Porter ; Britton, 



Man. 923. 1901. 



Rough-pubescent, slender, 3-8 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 or narrowed 

 at the base, crenate-dentate, or incised, 

 2'-4' long, 4'-i' wide, the upper pairs dis- 

 tant and small ; inflorescence cymose- 

 paniculate ; heads 5-flowered, about 3 high ; 

 involucre campanulate, its bracts linear- 

 lanceolate, acute, imbricated in about 3 

 series, densely pubescent, the outer shorter ; 

 flowers white. 



In moist soil, Massachusetts to Pennsylva- 

 nia, West Virginia, Florida and Louisiana, 

 mostly near the coast. Called also wild hoar- 

 hound. July-Sept. 



14. Eupatorium rotundifolium L. 



Round-leaved Thoroughwort. 

 Wild Hoarhound. Fig. 4165. 



E. rotundifolium L. Sp. PI. 837. 1753. 



Pubescent, branched at the summit, i-3 

 high. Leaves opposite, sessile, broadly ovate, 

 often as wide as long, acutish or obtuse, trun- 

 cate to subcordate at the base, coarsely dentate- 

 crenate, i'-2' long, ascending; inflorescence 

 cymose-paniculate; heads about 5-flowered, 

 2"-3" high; involucre campanulate, its bracts 

 linear-oblong, acutish, densely pubescent, im- 

 bricated in about 3 series, the outer shorter; 

 flowers white. 



In dry soil, Rhode Island to Pennsylvania, 

 Florida, Kentucky, Arkansas and Texas. Erro- 

 neously reported from Canada. July-Sept. 



15. Eupatorium pubescens Muhl. Hairy 

 Thoroughwort. Fig. 4166. 



E. pubescens Muhl.; Willd. Sp. PI. 3: 1755. 1804. 



Eupatorium rotundifolium var. ovatum Torr. ; DC. 

 Prodr. 5: 178. 1836. 



Puberulent or pubescent, branched above, 

 usually taller than the preceding species. Leaves 

 opposite, ovate, sessile, often twice as long as 

 wide, acute at the apex, rounded or subtruncate 

 at the base, coarsely dentate with acute or acut- 

 ish teeth, or the lower incised ; inflorescence 

 cymose-paniculate, sometimes 10' broad ; heads 

 5-8-flowered, 2"-3" high ; involucre campanu- 

 late, its linear-oblong bracts in 2 or 3 series, 

 the outer shorter; flowers white. 



In dry soil, Maine to Pennsylvania, South Caro- 

 lina, West Virginia and Tennessee. Recorded 

 from Florida. Ascends to 3000 ft. in Virginia. 

 July-Sept. 



