782 COMPOSITAE (COMPOSITE FAMILY) 



§1. EUPATORIUM proper. Beceptaclc flat. 



* Heads cylindrical., o-l6-flowered ; the purplish bracts numerous,, closely im- 



bricated in several roics, of unequal length, slightly striate; stout herbs^ 

 with ample mostly whorled leaves., and flesh-colored flowers. 



1. E. purpureum L. (Joe-Pye VVked, Trumpet Weed.) Stems tall (0.5-3 

 m. high) and stout, simple ; leaves 3-6 in a whorl, oblong-ovate or lanceolate, 

 acuminate, thin, smootliisli, rather finely cre'iate-dentate ; inflorescence hemi- 

 spherical, ovoid, or pyramidal-paniculate, the branches long and spreading, much 

 overtopping the leaves; flowers pale pink or whitish. {E. trifoliatum L.) — 

 Low groimd, often in woods and thickets, N. H., westw. and south w. Var. 

 ANorsTiFOLiiTM T. & G. (vRW falcatuni Britton), with narrowly oblong-lanceolate 

 to lance-linear often falcate leaves, seems to be only a weak form or state. 



Var. maculatum (L.) Darl. More pubescent, with thicker more rugose ovate 

 to ovate-oblong incisely and coarsely toothed leaves and fiattish-topped cymose- 

 panicles of more crowded rose-purple or paler heads, (E. maculatum L.) — 

 Generally in v/etter places, Nfd., westw. and southw. 



Var. amoenum (Pursh) Gray. Low ; leaves fewer, often opposite, ovate 

 or oblong ; heads few. — Range of the preceding variety. 



Var. foliosum Fernald. Leaves thin, elongate, the upper much overtopping 

 the compact flat-topped inflorescence. — Nfd. to n. Mich, and la. 



* * Heads S-20-flowered ; involucre o/8-15 more or less imbricated and unequal 



bracts, the outer ones shorter ; floioers white or nearly so. 



•i- Leaves all alternate, mostly dissected; heads panicled, very small, 3-5- 



flov:ered. 



'2. E. capillifblium (Lam.) Small. (Dog Fennel.) Smooth or nearly so, 

 paniculately much branched, 1-3 m. high, leaves 1-2-pinnately parted, filiform. 

 (B. foeniculaceum Willd.) — Va., near the coast, and southw.; adventive near 

 P'ailadelphia. 



■»-- -(- Leaves long-petioled, the upper ones alternate; heads 12-lo-floivered, in 



compound corymbs. 



3. E. ser6tinum Michx. Stem pulverulent-pubescent, bushy-branched, 1-2 

 m. high ; leaves ovate-lanceolate, tapering to a point, triple-nerved and veiny, 

 coarsely serrate, 0.5-1.5 dm. long ; involucre very pubescent. — Alluvial ground, 

 Md. to Minn., e. Kan., and southw. 



•4- +- 4- Leaves sessile or nearly so, vnth a narrow base, mostly opposite ; heads 



mostly b-flowered. 



*-*■ Involucral bracts ivith white and scarious acute tips. 



4. E. album L. Boughish-hairy, 3-8 dm. high ; leaves oblong-lanceolate, 

 coarsely toothed, veiny ; heads clustered in the corymb ; involucral bracts closely 

 imbricated, rigid, narrowly lanceolate, longer than the flowers. — Sandy and 

 barren places, pine barrens of L. I. to Va., and southw.; also dry slopes of the 

 southern Alleghenies. 



Var. subvenbsum Gray. Less rough ; leaves 2.5-5 cm. long, finely toothed 

 and less veiny. — L. I. and N. J. 



5. E. Ieuc61epis T. & G. Minutely pubescent, simple, 3-6 dm. high ; leaves 

 linear-lanceolate, closely sessile, l-nerved, obtuse, minutely serrate, rough both 

 sides ; corymb hoary. — Sandy bogs, L. L, N. J., and southw^ 



■*-*■ ++ Bracts not scarious or only obscurely so, obtuse, at length shorter than 



the floioers. 



6. E. hyssopif51ium L. Minutely pubescent, 3-6 dm. high ; leaves narrow, 

 linear or nearly so, 3-') cm. long, obtuse, 1-3-nerved, entire, or the lower toothed, 

 often crowded in the axils, acute at the base. — Sterile soil, Mass. to Va., e. Ky., 

 and southw. 



