TETRANDRIA.— MONOGYNIA. To 



HAB. In water. July — Aug. lj. . Root creep . ; stem 



partly submerge red ;fi. sm., axillary. 

 P. pcctinacea : leaves all pectinately pinnatifid. 

 HAB. Sandy swamps. Aug. y. . Leav. finely pec- 



finate; angles of the cap. rather obtuse. 



TETRANDRIA 

 MONOGYNIA. 



A. Flowers superior. 

 | Monopetalous. 



104. CEPHALANTHUS. Common col ; proper mi- 



nute, angular, 4-cleft. Cor. tubular, slender, 4- 

 cleft. Style much exserted ; stig. globose. Cap. 

 2-celled, 2-seeded, (mostly 2-partile.) Recept, 

 globose, hairy. 



105. DIPSACUS. Flowers in an ovate or roundish capi- 



tulum. — Common cal. (involucrum) many-leaved, 

 foliaceous ; proper superior, of one leaf. Cor. 

 tubular, 4-cleft. Seed solitary. Recept. conic, 

 paleaceous. Pappus cyathiform. 

 J 1)6. GALIUM. Cal. 4-toothed. Cor. monopetalous. 

 rotate, 4-cleft. Seeds 2, globose. 



i07. SPERMACOCE. Cal. 4-toothed. Cor. infundibu- 

 liform, 4-cleft. Cap. 2-celled, not 2-parted ; cells 

 1 -seeded, bidentate. Seeds with inflected mar- 

 gins. 



108. DIODIA. Cal. deeply 2-cleft, persistent. Cor. 

 tubiilar-infundibuliibrm, 4-cleft. Cap. 2-celled : 

 \ cells one-seeded. 



,11) IIOUSTOMA. Cal. 4-toothed. Cor. infundibu- 

 liform, '4-cleft. Cap. half-superior, 2-celled. 2 

 valved, many-deeded, opening transversely. 



HI. MITOHELLA. Flower.-, by pairs upon the same 

 nnen. Cal* 4-toothed. Cor. infundibuliform ; 

 tube cylindrie ; limb 4 -parted, spreading, villous 

 on the inner side. Slam, scarcely exserted. Stig 

 4-cleft. (jerry, by the union of 2 germens, didy- 

 mo- led 



