314 LXXV. COMPOSITE. EUPATORIUM. 



series; receptacle naked ; corolla 5-tootlied, enlarged at the throat; 

 branches of the style much exserted ; achenia 5-angled, crowned with 

 a cup-shaped pappus of 5, obtuse, horny scales. % Aquatic, glabrous, 

 simple, with 1 3 terminal heads. Lvs. verticillate. Fls. purple. 



S. VERTICILLATA. Cass. (Sparganophorus. Michx.} 



In shallow water, N. J. to Flor. Stem decumbent at base, 1 2f high. 

 Leaves in numerous whorls of about 6, linear-setaceous, entire, 1' in length. 

 Head commonly solitary, at top of the stem. Jl. Sept. 



4. EUPATORIUM. 



Dedicated to Eupater, king of Pontus, who first used the plant in medicine. 



Flowers all tubular ; involucre imbricate, oblong ; style much ex- 

 serted, deeply cleft ; anthers included ; receptacle naked, flat ; pappus 

 simple, scabrous 5 achenia 5-angled. % Herbs, with opposite or verti- 

 cillate leaves. Hds. corymbose. Fls. of the cyanic series, that is, white, 

 blue, red, fyc.. never yellow. 



* Leaves verticillate. Flowers purpk.-f 



1. E. FISTULOSUM. Barratt. (E. purpureum. Willd. in part. E. macn 

 latum. Linn, in part. E. purpureum. y. angustifolium. T. fy Or.) Trum- 

 pet-weed. St. fistulous, glabrous, glaucous-purple, striate or fluted ; Ivs. 



in about 12 whorls of 6s, largest in the middle of the stem, rather finely glan- 

 dular-serrate ; midvein and veinlets livid purple ; corymb globose, with whorled 

 peduncles. Thickets, U. S. and Can., very abundant in the Western States ! 

 Height 6 lOf, hollow its whole length. Leaves, including the 1' petiole, 8' by 

 2'. Corymb often If diam. Flowers purple. The glaucous hue and suffused 

 redness of this majestic plant are most conspicuous in flowering-time. It does 

 not appear to possess the acrid properties of E. maculatum. July Sept. 



2. E. MACULATUM. (E. purpureum, 0. Dart.} Spotted Eupatorium. 



St. solid, striate, hispid or pubescent, greenish and purple, with numerous 

 glands and purple lines; the glands on the stem and leaves give out an acrid 

 effluvium in flowering-time; Ivs. tripli-veined, 3 5 in a whorl. Low grounds, 

 U. S. and Can. Stem 4 Of high. Leaves petiolate, 6 T by 3 4', stronglv 

 serrate. Flowers purple. July Sept. 



/?. urticcefolium. Barratt. Height 4 5f; st. solid, slender; Ivs. thin, much 

 longer than the usual form of E. maculatum. 



3. E. PURPUREUM. Linn, not of DC. Willd. nor Ph. (E. verticillatum. Willd.) 

 St. solid, glabrous, green, sometimes purplish, with a purple band at the 



joints about 1' broad ; Ivs. feather- veined, in whorls of 3,4 and 5, smooth above, 

 with a soft pubescence beneath along the midvein and veinlets, coarsely serrate. 

 Dry woods or meadows, common, U. S. and Can. Stem 6f high. Leaves 

 thin and soft, 9 12' (including the 1' petiole) by 3 4'. Corymb lax, pale pur- 

 ple, varying to whitish. Aug. Sept. 



/?. album. Barratt. (E. trifoliatum. Darl.} Fls. dull white ; Ivs. 5 in a whorl, 

 large and distant. It occurs also with 4 leaves in a whorl a tall variety, 

 upper leaves subfalcate ; also with 3 leaves in a whorl tall and slender. 



4. E. TERNIFOLIUM. ELI. (in part.) 



St. solid, somewhat hispid and glandular, greenish, with purple dots and 

 lines ; Ivs. mostly 3 in a whorl, the upper and last whorls smooth and finely ser- 

 rate. 



0. vesiculosum. Barratt. St. striate, purplish, solid, 2 3f high. Abundant 

 in meadows and pastures. A handsome variety, with a profusion of purple 

 flowers in a large, spreading corymb. The leaves present a vesicular appear- 

 ance in a remarkable degree on their upper surface. 



* * Leaves opposite. Heads 3 5-flowered. 



5. E. HYSSOPIFOLIUM. Narrow-leaved Eupatorium. 



Lvs. opposite (the upper ones alternate), often verticillate, linear-lanceo-/ 



t This section according to Dr. Barratt. See preface. 



