162 TRIANDRIA. TRIGYNIA. pRosERPiNACAi 



Leaves alternate, sessile, about 2 inches long, very acutely 

 serrate, attenuated at the base, smooth ; the lower or sub- 

 merged ones pinnatifid, with linear divisions. Fioivers axil- 

 lary, solitary or aggregated, (2—4,) oblong, triangular. Calyx 

 with 3 lanceolate spreading segments. Stamens included. 

 Styles ; stigmas 3 ; pubescent, spreading. Nut very acutely 

 triangular, with the sides broadly cordate. 

 Hab. In ditches and on the borders of ponds, &c. July- 

 August. 



2. P. pectinacea L a m. : leaves all pectinatelypinnatifid. 

 Lam. III. I. p. 214. t. 50. f. 1. Pursk FU I. p. 92. 

 Elliott SA:. I. p. 192. Roetn. ir Schult. II. p. 874. 

 P. palustris ^. Mich. Fl. I. p. 76. 



Root perennial. Stem about as high as in the preceding species. 



Leaves handsomely pectinated, with very narrow divisions. 



Cafisules with the angles rather obtuse, rugose when mature. 

 Hab. Sandy swamps in the pine barrens of New-Jersey. In 



Pennsylvania. Afu A /<?n A er 5-. August. 



The P- fiectinacea is made a variety of fialustris by Mi- 



ehauar, but I think, with Furshj that it is a distinct spe-> 



dcs. 



