ORDER LXViir. — COMPOSITE, 361 



lanceolcate, coareely serrate, glabrous, doted on the under surface. 

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

 leaves. Seeda angled ; pappus scabrous. — Purple. IX. 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 large 

 doses an emetic. 



Genus XII.— MIKA'NIA. WiUd. 



(In honor of Prof. James Mikan.) 



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

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

 Style long, deeply cleft. Fcq^jyus pilose. Achenid angled. 

 Twining plants. 



1. M. scan'dens, (Willd.) Stem twining, glabrous. Leaves cordate, 

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

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

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



2. M. PUBEs'cEKS, (Muhl.) Stem twining, pubescent ; striate. Leaves 

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

 Flowers in axilhiry and terminal paniculate corymbs ; involucre 5- 

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

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

 Common. 15 — 20 feet. 



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

 (From ko7ios, 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, iu one series. Achenia angled, 

 glabrous. Herbaceous plants with opposite, toothed leaves. 

 Heads in terminal crowded corymbs. 



1. C. CCELESTINUM, (L.) StcjH pubesccut. Leaves opposite, cordate- 

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

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

 cent leaves. Seed aaglad ; pappus scabrous. Receptacle come. — Light 

 blue, with red dots. Fragrant. U- Sept.— Oct. Ricii shaded soils. 

 2—3 feet. 



Tribe HI.— ASTEROl'DE.*:. 



Capitula helerogamous, rarely bomogMiuous or dioecious. 

 Staminate flowers tubuhir, regularly tootlied. Style with the 

 branches flat, linear or lanceolate, pubescent externally at the 

 base. 



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

 (From gala, milk.) 



Heads many-flowered, helerogamous; ray florets neutral, 

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



