EuPATORiuM. COMPOSITiE. 87 



are often very coarse and irregular, sometimes even and more numerous ; 

 the upper leaves small, usually lanceolate or deltoid-lanceolate, tapering 

 from the base to the apex, but usually rather obtuse, often entire, except a 

 few coarse teeth near the base, occasionally deeply incised. Corymbs small 

 and dense, often somewhat paniculate. Scales of the involucre with scarious 

 margins, little longer than the mature achenia. — The specific name of Will- 

 denow and that of Michaux were published during the same year (1803). 



13. E. rotundifoUum (Linn.) : stem densely pubescent, corymbose at the 

 summit ; leaves opposite, roundish-ovate, mostly obtuse, truncate or some- 

 what cordate at the base, sessile, tripli-nerved, veiny, scabrous and pubes- 

 cent, pale or somewhat hoary and glandular beneath, deejily crenate-toothed; 

 corymb fastigiate; heads 5-flowered ; scales of the involucre 8-10, very pu- 

 bescent, glandular ; the exterior very short; the interior linear-lanceolate, ab- 

 ruptly acute or acuminate, scarcely shorter than the flowers; achenia glan- 

 dular.— !.;■??«. .' sjjec. 2. p. 837 ; Wilid. ! spec. 3. p. 1754 ; Michx. ! fl. 2. 

 p. 98 (partly) ; Ell. sk. 2. p. 300 ; Hook. ji. Bar. -Am. 1. ;;. 304 ; DC. ! 

 ■prodr. 5. p. 178. E. Marubium, Walt. Car. p. 199, ex Ell. Eupatoria 

 valerianoides Virginiensis, &c. Pluk. ! aim. p>. 141, t. 88, f. 4. 



Dry sterile soil, particularly in pine barrens, (Canada, Pursh, Mr. Goldie,) 

 New Jersey ! to Florida ! Louisiana ! and Texas ! July-Sept. — Stem 2-3 

 feet high, slender. Leaves 1-2 inches long. Pappus a little longer than 

 the corolla. — Wild Hore-hound. 



14. E. puhescens (Muhl.) : stem very pubescent or somewhat hirsute, 

 corymbosely branched at the summit ; leaves opposite, ovate, mostly acute, 

 slightly truncate at the base, sessile, somewhat tripli-nerved, veiny, more or 

 less pubescent, slightly scabrous, obscurely glandular-punctate, dentate- 

 serrate ; corymb fastigiate ; heads 7-8-flowered ; scales of the involucre 

 10-14, pubescent and glandular; the exterior very sliort; the interior lanceo- 

 late, acute, rather shorter than the flowers; achenia glandular. — Muhl. in 

 Willd. ! spec. 3. p. 1755 ; Willd. ! enum.. 2. p. 852 ; Pursh, Ji. 2. jj. 514 

 (excl. syn. Michx.) ; Ell. sk. 2. p. 301 ; DC. prodr. 5. f. 178/ E. scabri- 

 dum. Ell. I. c. p. 299.? E. ovatum, Bigel. fl. Bost. ed. 2. p. 296. E. ro- 

 tundifoUum ft.1 ovatum, Torr.! in DC. I. c. E. obovatum, Raf. in med. 

 repos. [hex. 2) 5. p. 359. 



Massachusetts ! New Jersey ! Pennsylvania, and probably in the Southern 

 States, in similar situations with the preceding. Aug.-Sept. — Stem 2-4 feet 

 high, usually a stouter and more branching plant than E. rotundifolium. 

 Leaves broadly ovate or ovate-oblong, 2-3 inches long and about 1^ wide 

 near the base, rather obtusely and coarsely serrate ; the teeth (as in the pre- 

 ceding) either simple and equal, or occasionally unequal, thus becoming 

 somewhat doubly serrate. Scales of the involucre with scarious summits. 

 Corolla, pappus, &c. as in E. rotundifolium, which it sometimes approaches 

 perhaps too closely ; but the heads appear to be uniformly more than 5- 

 flowered. — The specimens in Willdenow's herbarium (particularly fol. 2.) 

 certainly belong to this species ; but that author states the heads to be 5- 

 flowered. 



t t Leaves closely sessile or partly clasping at the base, or sometimes connate : 

 heads 10-20- (rarely 5-) flowered. 



15. E. sessilifolium (Linn.) : glabrous; stem corymbosely branched above; 

 leaves opposite, closely sessile or partly clasping, distinct, rounded at the 

 base, lanceolate or ovate-lanceolate, tapering from near the base to the acu- 

 minate apex, sharply serrate, veiny, obscurely punctate and paler beneath ; 

 corymb compound, pubescent ; heads 5-flowered ; scales of the involucre 10, 

 imbricated somewhat in a triple series, oval or oblong, obtuse, cunescently 



