ORDER LXVIII. — COMPOSITE. 361 



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

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

 leave?. Seeds angled ; pappus scabrous. — Purple. 2£. Sept. — Oct. 

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



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

 perfoliatum 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 larga 

 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. M. scan'dens, (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'cens, (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. 2f. July — August. 

 Common. 15 — 20 feet. 



Genus XIIL— CONOCLIN'IUM. D. C. {Eupatorium ccelestinum, L.) 

 (From koiws, 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. ccelestinum, (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. 2f.. Sept. — Oct. Rich shaded soils. 

 2—3 feet. 



Tribe III.— ASTEROI'DE^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. 



Genus XIV.— GALATEL'LA. Cass. {Aster hyssopi/olia, Nees.) 

 (From gala, milk.) 



Heads many-flowered, heterogamous ; ray florets neutral, 

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



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