Eupatorium. COMPOSIT.E. 99 



wide, rather rigid, S-nerved from near the base. — E. pari-iflorum, Tar. landfoUum, Torr & 

 Gray, 1. c. — AV. Louisiaua aud Texas, Dnimmond, L'-arenwortk, Hale. 

 E. altlSSimum, L. Pubescent: stems 4 to 7 feet high, branched at summit, very leaf)- : 

 leaves lanceulate, tapering gradually to both ends, acuminate, acutely serrate aljove tlie 

 middle, 2 to 4 iijchcs long, witli 3 conspicuous parallel nerves (giving the aspect of a tripli- 

 nerved .S'«//<A/7i<) ; uppermost entire: cymes numerous and irregular: heads fully 3 Hues 

 long: involucre canescently pubescent; its bracts oblong and very obtuse. — Jacq. Hort. 

 A'ind. t. 164 ; Michx. Fl. ii. 97 ; Torr. & Gray, 1. c. K^ihnia glutinosa, DC. Prodr. > . 127, 

 not Ell. — Dry ground, Penn. to Iowa, X. Carolina, and Texas. 



^ = ^ Leaves sessile or very short-petioled with a broad base, normally opposite, occasionally 

 3-nate: involucre pubescent. 



II. Heads mostly 5-flowered, in one species 6-8-flowered: herbage roughish -pubescent: inner bracts 

 of involucre acutish or acute, or sometimes acuminate at the thin tip. 



B. teucrifolium, Willd. Stem 2 or 3 aud even 8 feet high, not very leafy : leaves ob- 

 long, coarsely and irregularly serrate, rarely somewhat incised, slightly peticded (2 to 4 

 inches long) ; the upper small and few-toothed, sometimes hastately 1-2-toothed near the 

 broad sessile base, or lanceolate and entire, usually alternate, as are the branches of the 

 corymbiform general inflorescence : cymes rather small and dense. — Spec. iii. 1753, & Hort. 

 Eerol. t. 32 ; Torr. & Gray, 1. c. E. pilosum, Walt. Car. 199 1 E. varhenafolium, :\lichx. 

 Fl. ii. 98. E. lanceolatum, Jluhh in Willd. 1. c. E. pubescerix, Biccel. Fl. Bost. ed. 2, 296, 

 not Muhl. — Moist and shady ground, Mass. to Florida and Louisiana. 



E. rotundifolium, L. Stem a foot to a yard high, strict, corymbosely branched at sum- 

 mit: leaves in the typical form round-ovate, olituse or abruptly acute, sessile or nearly so 

 from a truncate or obscurely cordate base, regularly and closely crenate-dentate, veiny (larger 

 2 inches long) : cymes corj^mbosely fastigiate, dense. — Spec ii. 837 (Pluk. Aim. 141, t. 88, 

 fig. 4); Tc;rr. & Gray, I.e. E. Marrubium,\\'alt. Car. 199^ — Dry aud sterile soil, espe- 

 cially in pine barrens, Canada ; and Xew Jersey to Florida and Texas. 



Var. Scabridum. A form with smaller (an inch or two long) and more scabrous or 

 cinereous leaves, the upper and sometimes all with cuneate base; affecting drier and more 

 sterile soil. — E. scabridum, Ell. Sk. ii. 298; Chapm. Fl. 196. — Lower part of S. Carolina 

 to Florida and Texas. 

 .. Var. ovatum, Toek. Commonly taller and larger ; leaves ovate (often 2 or 3 inches 



long), acute, hardly truncate at base, more strongly serrate, sometimes laciuiately so, either 

 roughish-pubescent or sm'oother and glabrate ; heads sometimes but not generally 7-8-flow- 

 ered. — Torr. in DC. Prodr. v. 178. E. pubescens, iluhl. in AVilld. Sper. iii. 1155; AViild. 

 Enum. ii. 852 ; Torr. & Gray, 1. u. E. obomtum, Eaf. in iled. Eep. hex. 2, -v . 359 1 E. ova- 

 tum, Bigel. FL Bost. ed. 2, 296. — ilassaelmsetts to S. Carolina, near the coast. 



h. Heads 5-flowered: herbage glabrous : narrow involucre more imbricated ; its bracts obtuse. 



B. sessilif olium, L. Corymbosely branched above, 2 to 6 feet high : leaves oblong- or 

 ovate-lanceolate, tapering from near the rounded or truncate closely se.-sile base into a nar- 

 row acumination, finely serrate, pinnately veiny (3 to 6 inches long) : cymules small aud 

 crowded, few-headed, numerous in effusely compound cymes. — Spec. ii. 8-'37 ; Torr. & Gray, 

 ]. c. E. truncatum. Ell. Sk. ii. 298, not WiUd. — Dry and wooded groimd, Mass. to Illinois, 

 ^'irginia, and along the mountains to Alabama. 



c. Heads 10-15-flowered (or by confluence sometimes many-flowered), much crowded: leaves perfo- 

 Uate or connate-claeping, divaricate, narrow and elongated, one-ribbed: stems 2 to 4 feet high. 



B. perfoliatum, L. (Thoeoughwoet, Boxeset.) Stem viUous-ijubescent, fastigiately 

 branched above, stout : leaves lanceolate, connate-perfoliate, tapering gradually to an acumi- 

 nate apex, finely and closely crenate-serrate, rugose, soft-pubescent, or almost tomentose 

 beneath, 4 to 8 inches long: heads small (3 lines long) but very numerous, in dense com- 

 pound-corymbose cvmes, mostly 10-flowered: bracts of the involucre linear-lanceolate, with 

 slightlv scarious acutish tips. — Spec. ii. 838 (Pluk. Aim. 140, t. 87, fig. 6) ; Bart. Veg. Med. 

 Mat. t! 37 : Bigel. Med. Bot. i. 38, t. 2 ; Eaf. Med. Bot. t. 36 ; Torr. & Gray, L c. 88. — Wet 

 ground, New Brunswick to Dakota, south to Florida and Louisiana. Varies -with purple 

 flowers (Penn. Porter), and with leaves in threes (Virginia, Curtiss, &c.) ; also into 



Var. truncatuin, with the upper or even all of the leaves disjoined and truncate at 



