ORDER LXVIII. — COMrOSITJE. 361 



lanceolate, coarsely serrate, glabrous, doted on the under surface. 

 Fhicers in terminal corymbs; involucre with 10 — 12 ovate, obtuse 

 loaves. Seeds angled; pappus scabrous. — Purple. If. Sept. — Oct. 

 Middle and upper Car. and Geo. 4 — 6 feet. 



Many of the species of Eupatorium possess decided medical properties. The E. 

 perforatum is a well-known domestic medicine, and has been used with much success 

 in arresting disease in its incipient state. It is a tonic and diaphoretic, and in large 

 doses an emetic. 



Genus XII— MIKA'NIA. "Willd. 



(In honor of Prof. James Mikan.) 



Involucre 4 — 6-leaved, equal, with 4 — 6 florets. Corolla 5- 

 toothed, dilated. Receptacle naked ; florets all perfect, tubular. 

 Style long, deeply cleft. Pappus pilose. Achenia angled. 

 Twining plants. 



1. If. scan'dexs, (Willd.) Stem twining, glabrous. Leaves cordate, 

 acuminate, repand toothed, with unequal divaricate lobes. Flowers in 

 axillary corymbs. — Bluish-white. 2£. July — Sept. Margins of rivu- 

 lets. Common. 10 — 15 feet. Climbing Thoroughwort. 



2. M. pubes'cexs, (Muhl.) Stem twining, pubescent ; striate. Leaves 

 cordate, acuminate, angularly toothed, somewhat hastate at the base. 

 Flowers in axillary and terminal paniculate corymbs ; involucre 5- 

 leaved, one smaller than the rest, hairy. Flowers fragrant. Seed ob- 

 long, striate ; receptacle dotted. — Pale purple. % . July — August. 

 Common. 15 — 20 feet. 



Gran XIII.— COXOCLIX'IUM. D. C. {Eupatorium ccelestinum, L.) 

 (From konos, a cone, and klino, a bud, in allusion to the receptacle, which is conic.) 



Heads many-flowered Involucre campanulate, scales in 2 — 

 3 series, linear, acute. Receptacle naked, conical. Corolla 5- 

 cleft. Pappus pilose, scabrous, in one series. Achenia angled, 

 glabrous. Herbaceous plants with opposite, toothed leaves. 

 Heads in terminal crowded corymbs. 



1. C. coilestixum, (L.) Stem pubescent. Leaves opposite, cordate- 

 ovate, on short petioles, deltoid, slightly scabrous, obtusely toothed. 

 Flowers in fastigiate corymbs ; involucre with numerous linear, pubes- 

 cent leaves. Seed angled ; pappus scabrous. Receptacle conic. — Light 

 blue, with red dots. Fragrant. If. Sept. — Oct. Rich shaded soils. 

 2—3 feet. 



Tribe III.— ASTEROFDE^E. 



Capitula heterogamous, rarely homogamous or dioecious. 

 Staminate flowers tubular, regularly toothed. Style with the 

 branches flat, linear or lanceolate, pubescent externally at the 

 base. 



Gents XIV.— GALATEL'LA. Cass. (Aster hyssopifolia, Xees.) 

 (From aala, milk.) 



Heads many-flowered, heterogamous ; ray florets neutral, 

 those of the disk perfect. Involucre shorter than the disk, with 



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