EuPATORiuM. COMPOSITiE. 327 



tided. — E. purpureum, j8. Linn. sp. ed. 1. I. c. E. purpureum, var. maculatum, Darlingt. 

 I. c; Torr. <^ Gr. I. c. E. maculatum, Linn. sp. ed. 2. p. 1174; Willd. I. c. ; Michx. I. c; 

 Bart. fl. Am. Sept. t. 102. E. punctatum, Willd. enum. 2. p. S53 ; Pursh, fl. 2. p. 515, 

 E. amoenum, Fursh, I. c. E. ternifolium, Ell. sk. 2. p. 306. E. trifoliatum, Linn. I. c. 



An extremely variable plant. Stem 3-8 feet high, hollow, or more or less completely 

 filled with pith. Leaves 3-8 inches long and 2-3 inches wide, sometimes (particularly in 

 dry open situations) very rugose and of a thick texture, at other times (especially in shady 

 swamps) thin and membranaceous, often cuneate at the base, with a very distinct petiole. 

 Corymb sometimes nearly a foot in diameter. Involucre purplish or whitish ; the scales 

 12 - 18, lanceolate and oblong, slightly 2 - 3-nerved. Corolla pale purple or flesh-color. 

 Style very much exserted, bulbous at the base. 



Swamps, borders of low woods, and wet thickets ; very common. August. 



The various forms of this plant have been regarded as distinct species by many botanists, 

 but they seem to pass insensibly into each other. A decoction of the root is used as a remedy 

 for gravel. The popular name is said to be that of an Indian who recommended it to the 

 whites. 



^ 2. Heads somewhat cylindrical or campanulate, 5 - many-flowered : scales 8-15, more or less 

 imbricate ; the exterior shortest : leaves opposite : flowers white : leaves, corolla and achenia 

 more or less dotted with resinous grains. 



2. EupATORiuM LEucoLEPis, T. 8f G. (PI. xlviii.) WMte-scoled Hemp-weed. 



Stem mostly simple, puberulent ; leaves opposite, divaricate, lanceolate or linear, obtuse, 

 closely sessile, serrate, very rough on both sides, punctate, strongly one-nerved , the lower 

 ones obscurely 3-nerved or somewhat veiny ; corymb fastigiate, canescent ; scales of the 

 involucre 8-10, lanceolate, acute or acuminate, very pubescent and glandular on the back, 

 white and scarious at the summit, as long as the flowers ; achenia minutely glandular. — 

 Torr. ^ Gr. fl. N. Am. 2. p. 84. E. glaucescens, (3. leucolepis, DC.prodr. 5. p. 111. E. 

 linearifolium, Michx. fl. 2. p. 97 (partly) ; Pursh, fl. 2. p. 513 (partly) ; Nutt. gen. 2. p. 135. 



Stem about 2 feet high, slender. Leaves 2 inches long and 4 — 5 lines wide, spreading and 

 often a little recurved, sometimes fascicled in the axils, of a pale glaucous hue ; the serratures 

 appressed. Branches of the small compound corymb clothed with a short whitish pubescence. 

 Corolla dilated at the base ; the limb campanulate ; lobes ovate, short. Style much exserted. 



Rather dry sandy swamps ; near Sag-Harbor, Long Island {Mr. S. B. Buckley). Fl. 

 August - October. 



3. EuPATORiUM TEUCRiFOLiUM, Willd. Germander-leaved Hemp-wecd. 



Stem roughish-pubescent, corymbose at the summit ; leaves opposite (the uppermost often 

 alternate), closely sessile, ovate-oblong and ovate-lanceolate, obtuse or truncate at the base, 



