CATALOGUE OF PLANTS. 411 



P. Ehrenbergii (Corda), A. Br. 

 Frequent in pools. 



P. tetras, Ehrb. 



Same habitat. 



CCELASTRUM, Nseg. 

 C. Cambricum, Arch.* 

 In ponds. 



C. microporum, Nseg. 

 Same habitat. 



Sub-Class 4.-CONJUGAT-ffi. 



MESOCAKPE.E. 



MBSOCARPUS, Hass. 



M. scalaris (Hass.), De By. 



In marsh and meadow pools ; frequent. 



M. nummuloides, Hass. 



In similar localities. 



PLBUROCARPUS, A. Br. 

 P. mirabilis, A. Br. 



In pools ; very common ; sterile. 



STAUROSPBRMUM, Kutz. 



S. Capucinum, Kiitz. 



Burlington : Atsion, Pleasant Mills, and generally frequent m 

 ponds. 



S. quadratum, Kiitz. 



Morris : Budd's Lake, and other ponds. 



* Replaces P. sphcericum of the Preliminary Catalogue. C. Ncegelli of that cata- 

 logue is not now regarded as a New Jersey plant. 



