782 COMPOSITAE (COMPOSITE FAMILY) 



1. EUPATORIUM proper. Receptacle flat. 



* Heads cylindrical, 3-15-flowered ; the publish 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-PvE WEED, TRUMPET WEED.) Stems tall (0.5-3 

 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 south w. Var. 

 ANGUSTIFOLIUM T. & G. (var. 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 flattish-topped cymose- 

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

 Generally in wetter places, Nfd., westw. and south w. 



Var. amoSnum ( l j ursh) 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 &-'2Q-flowered ; involucre 0/8-16 more or less imbricated and unequal 



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



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



flowered. 



2. E. capillifblium (Lam.) Small. (Doc FENNEL.) Smooth or nearly so, 

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

 (E. foeniculaceum Willd.) Va., near the coast, and south w.; adventive near 

 Philadelphia. 



-- *- Leaves long-petioled, the upper ones alternate; heads \2-l5-flowcred, 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 vi-iny, 

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

 Md. to Minn., e. Kan., and south w. 



--- Leaves sessile or nearly so, with a narrow base, mostly opposite ; heads 

 ^ mostly 5-flowered. 



++ Involucral bracts with white and scarious acute tips. 



4. E. album L. Eoughish-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 south w.; 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. .1. 



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 south w. 



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



the flowers. 



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

 linear or nearly so, 3-5 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 south w. 



