782 COMPOSITAE (COMPOSITE FAMILY^ 



§ 1. EUPAT6rIUM proper. Beceptade flat. 



^ Heads cylindrical^ S-15-flowered ; the purplish bracts numerous^ closely im 

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

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



1. E. purpureum L. (Joe-Pye Weed, Trumpet Weed.) Stems tall (0.6-3 

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

 acuminate, thin, smoothish, rather finely crenate-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 ground, often in woods and thickets, N. H., westw. and southw. Var. 

 angustif6lium T. & G. (\?ir. falcatum 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 wetter 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. folibsum Fernald. Leaves thin, elongate, the upper much overtopping 

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



* * Heads S-20-flowej'ed ; involucre of S-15 more or less imbricated and unequal 

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



■1- Leaves all alternate, mostly dissected; heads panicled, very small, 3-5^ 



flowered. 



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

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

 \e. foeniculaceum VVilld.) — Va., near the coast, and southw.; adventive neat 

 Philadelphia. 



•1- -»- Leaves long-petioled, the upper ones alternate; heads ll-ib-floioered, 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- H- Leaves sessile or nearly so, with a narrow base, mostly opposite; heads 



mostly b-flowered. 



++ Involucral bracts noith white and scarious acute tips. 



4. E. dlbum 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. subven5sum Gray. Less rough ; leaves 2.5-5 cm. long, finely toothed 

 and less veiny. — L. L 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. I., N. J., and southw. 



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



the flowers. 



6. E. hyssopif6lium L. Minutely pubescent, 3-6 dm. high ; leaves narrow, 

 linear or nearly so, S-6 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. 



