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CLASS IV. TETRANDRIA. 

 ORDER I. MONOGYNIA. 



72. CEPHALANTHUS, L. Gen. pi. 147. (Rubiacece.) 



Common calix ; proper superior, small and 

 angular, 4- cleft. Corolla tubular, slender, 

 4- cleft. Stamina included ; stigma globose. 

 Capsule mostly bipartile, (2 to 4 4 ) 2- ceiled, 

 2-seeded ; cells semi-bivalve ; exterior valve 

 angular, indurated, interior flat and flexile. 

 Seed solitary, sheathed at the apex with 

 a suberose callus. Receptacle globose, hai- 

 ry. — A r utt. 



occidentals. 1, C. leaves opposite and ternate. — Willd. 

 Icon. Pluk. aim. t. 77. f. 4. 



American Button-wood, Globe-flowered Shrub. 

 Pond Dogwood. 



Nothing- is more common in swamps, on the borders of ri- 

 vers, creeks, and ponds, than this shrub. The shores of the 

 Delaware and Schuylkill abound with it. About 5 feet is 

 commonest height, though it not unfrequently attains a great- 

 er stature. The inner bark is medicinal. July. 



73. DIPSACUS, L. Gen. pi. 148. (Dipsacex.) 



Flowers collected into an ovate or roundish 

 capitulum. — Common calix many-leaved, fo- 

 liaceous, (involucrum) ; proper superior, of 

 1 leaf. Corolla 4-lobed. Receptacle pa- 

 leaceous, chaff rigid, mostly longer than the 

 flowers. Pappus cup-shaped. — Nutt. 



