Eupatorium. COMPOSITE. 99 



wide, rather rigid, 3-nerved from near the base. E. parvijlorum, var. lancifolium, Torr & 

 Gray, 1. c. W. Louisiana aud Texas, Drmniuund, L< an mnnili, Hale. 

 E. altissinium, L. Pubescent: stems 4 to 7 feet high, branched at smmiiii, very ! 

 leaves lanceolate, tapering gradually to both ends, acuminate, acutely serrate above the 

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

 nerved X :>//<lar/<> ); uppermost entire: cymes numerous and irregular: heads 1'nllv 3 lines 

 long: involucre eauescently pubescent; its bracts oblong and very obtuse. Jacq. llort. 

 Viud. t. 1G4; Michx. Fl. ii. 97; Torr. & Cray, 1. c. Kn/miti ijlitlinotm, DC. Prodr. v. 127, 

 not Ell. Dry ground, Peun. to Iowa, N. Carolina, aud Texas. 



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

 3-uate: involucre pubescent. 



a. 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. 



E. teucrifoliuHl, WILLD. Stem 2 or 3 and even 8 feet high, not very leafy : leaves ob- 

 long, coarsely and irregularly serrate, rarely somewhat incised, slighlly peti^led (2 to 4 

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

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

 corymbiform general inflorescence: cymes rather small and dense. Spec. iii. 17.VJ, & llort. 

 Berol. t. 32; Torr. & Gray, 1. c. E. i>il*nm, Walt. Car. 199? E. verbencefolium, .Miehx. 

 Fl. ii. 98. E. faiir<_u/utnm, Muhl. in Wilkl. I.e. E. pubescens, Bigel. Fl.Bost.ed. 2, ^'.;ii, 

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



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

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

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

 2 inches long) : cymes corymbosely fastigiate, dense. Spec. ii. 8.37 (Pluk. Aim. 141, t. 88, 

 fig. 4); Torr. & Gray, 1. c. E. Hamibimn, Walt. Car. 199? Dry aud sterile soil, espe- 

 cially in pine barrens, Canada ! and New Jersey to Florida and Texas. 



Var. SCabriduHl. A form with smaller (an inch or two long) and more scahnm> ,, r 

 cinereous leaves, the upper and sometimes all with cuneate base; alTeciing drier ami i 

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

 to Florida and Texas. 



Var. OVatum, TORR. Commonly taller and larger: leaves ovate (often 2 or 3 inehes 

 long), acute, hardly truncate at base, more strongly serrate, sometimes lacii:iai< ly so, eiihe-r 

 roughish-pubescent or smoother and glabrate : heads sometimes but not generally 7 -S- flow- 

 ered. Torr. in DC. Prodr. v. 178. E. pubescens, Muhl. in Willd. Spec. iii. 11."); YYiild. 

 Enum. ii. 852 ; Torr. & Gray, 1. c. E. obovatum, Haf. in Med. Rep. hex. 2, v. 359 1 E. ova- 

 turn, Bigel. Fl. Bost. ed. 2, 296. Massachusetts to S. Carolina, near the coast. 



b. Heads 5-flowered: herbage glabrous : narrow involucre more imbricated ; its l.ra.-ls obtuse. 

 E. sessilifolium, L. Corymbosely branched above, 2 to 6 feet high: leaves oblong- or 

 'ovate-lanceolate, tapering from near 'the rounded or truncate closely sessile base into a, nar- 

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

 crowded, few-headed, numerous in effuselv compound cymes.- Spec', ii. 837 : 

 1. c. E. tnux-utnm, Ell. Sk. ii. 298, not Willd. Dry and wooded ground, i 

 Virginia, and along the mountains to Alabama. 

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



liate or connate-clasping, divaricate, narrow and elongated, one-ribbed: 



E perfoliatum L. (TIIOBOCGHWOUT, BONESET.) Stem villpus-pubescent, Eastigiately 

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

 nate apex finely and closely crenate-serratc, rugose, soft-pubescent, or almps 

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

 pound-corymbose cymes, mostly 10-flowered: bracts of the involucre linearJanceolate, * 

 slightly scarious acutish tips. - Spec. ii. 838 (Pluk. Abu. 140, t. 87, fig. 6J ; Bart. \ eg. 

 Mat. ^ 37 ; Bio-el. Med. Bot. i. 38, t. 2 ; Raf. Med. Bot. t. 3C, , Tprr. & Graj . 1. c. 

 ground, New Brunswick to Dakota, south to Florida and Louisiana. ^^ aries with purple 

 flowers (Peun. P^rl-r), and with leaves in threes (Virginia, Curtiss, &C ) 



Var truncatum with the upper or even all of the leaves disjoined and truncate 



