EuPATORiuM. COMPOSITiE. 89 



ino; in tufts, 2-3 feet hia;h. Leaves 4-6 inches long, or often shorter, 4 to 5 

 lines wide, pale, rather membranaceous, cohering to the paper in the pro- 

 cess of drying, on account of the numerous resinous globules intermixed with 

 the close pubescence. Heads rather small, very numerous. Involucre 

 short. Style moderately exserted. — This very distinct and apparently very 

 local species was discovered in the year 1833, by one of the authors of this 

 ■work, in the pine barrens of New jersey, where it occurred abundanth', 

 but we have never received it from any otlier quarter. In the Banksian 

 herbarium, however, there is a specimen from Bartram, said to have been 

 collected in Pennsylvania. In habit it resembles E. leucolepis; but the 

 leaves are rather flaccid, and clothed with a very soft pubescence, and the 

 involucre is ditferent. 



t t t Leaves on slender petioles : heads 12-15-flowered. 



19. E. serolinum (Mirhx.) : stem pulverulent-pubescent, much branched 

 above; leaves opposite, the upper frequently alternate, on slender petioles, 

 ovate-lanceolate, tapering above, acute, tripli-nerved and veinv, pubescent 

 or nearly glabrous, coarsely and sharply serrate ; corymbs numerous, com- 

 pound; heads 1-2-15-flowered ; scales of the involucre 10-12, linear-oblong, 

 with scarious margins, very pubescent, imbricated ; achenia glabrous, sel- 

 dom glandular.— iH/c/zx. .' ji. 2. p. 100 ; EIL! sk. 2. p. 304 ; DC. ! prodr. 

 5. p. 175. 



Damp soil, N. Carolina! to Georgia! and Illinois! to Arkansas! and 

 Louisiana ! Sept.-Oct. — Stem 5-6 feet high, usually diffusely and some- 

 what paniculately branched above; the branches either opposite or alternate. 

 Leaves 5-6 inches long ; the lower ones narrowly ovate, with numerous 

 coarse often irregular teeth ; those of the brandies often with few unequal 

 teeth towards the base. Heads very numerous, rather small. Pappus about 

 the length of the corolla. 



§4. Heads 8-30-JJoivered: scales of the campanulate involucre S-20, nearly 

 equal and in a single series: herbaceous : leaves opposite or rarely alternate, 

 ovate, petioled, not punctate or sprinkled with resinous globules: achenia not 

 glandular : flowers white or purj^le. 



20. E. ageratoides {h'wn. f.) : glabrous ; stem branching; leaves opposite, 

 on long petioles, broadly ovate, sometimes slightly cordate, acuminate, tripli- 

 nerved, membranaceous, coarsely and sharply serrate ; corymbs compound ; 

 heads 12-20-flowered ; scales of the involucre 12-14, equal, in a single 

 series, narrowly lanceolate, scarious and rather obtuse at the tips, slightly 

 pubescent and ciliate ; corolla narrowed below, campanulate at the summit, 

 lonser 'han the pappus; achenia glabrous. — Linn. f. ! suj)pl. p. 355; 



Willd. ! spec. 3. p. 1765 ; Pursh ! jl. 2. p. 516 ; Ell. 'sk. 2. ;;. 303 : Bigd. 

 fl. Bost. ed. 2. p. 298 ; Hook. fl. Bor.-Am. 1. p. 305; Darlingl. fl. Cest. 

 p. 451 ; DC! prodr. 5. p. 175. E. urticEefolium, Reich, syst. 3. p. 719 ; 

 Michx.! fl. 2. p. 100; not of Linn. f. Sf Smith. E. ceanothifolium, DC. 

 I. c. ? E. caule erecto, &c. Linn. ! hort. Cliff, p. 396. Ageratum altissi- 

 mum, Linn..' spec. 2. p. 839. 



Moist rich woodlands and thickets, Canada ! & Upper Missouri ! to Georgia! 

 and Louisiana! common, particularly in the Northern States. Aug.-Sept. — 

 Stem 2-3 feet high ; the summit and brandies a little pubescent. Leaves 

 usually large, 4-6 inches long, glabrous or with a few minute scattered hairs, 

 mostly dilated and obtuse or truncate at the base, sometimes abruptly taper- 

 ing into the petiole ; the latter 1 to 2 inches in length. Flowers pure white, 

 very numerous, exhaling a somewhat unpleasant odor. Lobes of the corolla 

 ovate, glabrous. Style much exserted. 



VOL. II.-12 



