CATALOGUE OF PLANTS. 209 



Porter. Burlington : Pemberton Miss Willmarth. Atlantic : 

 Egg Harbor City Parker ; Hammonton Bassett. Camden : 

 Winslow Parker. Gloucester: Near Mickleton B. Heritage. 



P. Pennsylvanicum, L. 



Low grounds. Common throughout the State. 

 P. incarnatum, Ell. 



In low grounds. Bergen : Rutherfurd Schuh. Sussex : 

 Lake Grinnell Britton. Camden : Banks of the Delaware 

 Martindale. 



P. PERSICARIA, L. Lady's Thumb. 



Waste places ; common. Naturalized from Europe. 

 P. HYDROPIPER, L. Water-pepper. 



Waste places ; common. Naturalized from Europe. 

 P. acre, H. B. K. 



In swamps. Common throughout the State. 

 P. hydropiperoides, Michx. 



In swamps. Frequent in the middle and southern counties ; 

 apparently less abundant northward. 



P. amphibium, L. 



Sussex : Abundant in Morris Pond Britton ; in a railroad 

 ditch near Lake Grinnell Porter. Hunterdon : Best. 



P. Hartwrightii, Gray. 



Sussex : In a swamp along L. & H. R. R. R., between Lake 

 Grinnell and Woodruff's Gap Porter & Britton, 1887. 



P. emersum (Michx.), Britt. (P. amphibium, L., var. terrestre, Willd.) 



Borders of swamps. Bergen : Closter Austin. Sussex : 

 Morris Pond and near Woodruff's Gap Britton. Warren : 

 Shore of the Delaware below Phillipsburg Porter. Huoter- 

 don : Bull's Island Best. Morris : Along the Black River at 

 Chester Britton. Mercer : Meadows below Tretiton E. Volk. 

 Gloucester : In meadows near Mickleton, becoming a nuisance 

 B. Heritage. 



P. Virginianum, L. . . 



In damp woods. Gloucester : Two miles south of Mullica 

 Hill B. Heritage; and common in the middle and northern 



counties. 



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