58o REPORT OF NEW JERSEY STATE MUSEUM. 



Beach Island there are only a few small pond holes, which dry up 

 in large part during the summer. These pond holes are the 

 habitat of such interesting species as Zannichellia paliistris and 

 Potamogcton pectinatus in the water, while on the wet, muddy, 

 sandy margin, or on the bottom as the water recedes, are 

 Limosclla, Hypericum horcale, Cyperus diandrus, Ilysanthes 

 anagallidia, Scirpus nanus, etc. 



In such a habitat grows the plant here temporarily referred 

 to Ltidwigiantha arcuata. It grows in extensive mats, creeping 

 over the moist sand and mud on the margin of a pond hole at 

 St. Albans. It appears to be a much miore robust plant than the 

 southern species and differs constantly from it in nunierous 

 characters, the most striking of which is the length of the flower 

 peduncle, which is shorter than the leaves, instead of longer. It 

 has not been possible, as yet, to make cormparison with material 

 from Virginia, the nearest known station, but unless this should 

 prove intermediate between the New Jersey plant and material 

 from farther south, the former would appear to represent a 

 distinct species." 



Fl. — July and August, probably. 



Cocsf 6'^n>.— St. Albans (L), (BC). 



ISNARDIA L. 



Isnardia palustris L. Marsh Purslane. ' 



Isnardia palustris Linnjeus, Sp. PI. 120. 1753 [Europe and Virginia]. — Bar- 

 ton, Fl. Phila. I. 85. 1818. 

 Ludwigia palustris Knieskern 14. — Britton 109. 



Ditches and edges of ponds ; common in the Northern. Middle 

 and Coast districts. Very rare and probably introduced in the 

 Pine Barrens. 



Fl. — Mid-June into September. Fr. — Mid-July into October. 



Middle District. — Farmingdale, Pemberton (NJ), New Egypt, Delanco 

 (S), Delair, Fairton (S). 



Pine Barrens. — Hammonton (T), Pleasant Mills (T). 



Coast Strip.— Forked River (NB), Surf City (L), Spray Beach (L), 

 Palermo (S), Ocean City (S), Holly Beach (UP), Cold Spring (OHB), 

 Cape May (P). 



LUDVIGIA L 



Ludvigia sphaerocarpa Ell. Globe-fruited Ludwigia. 



Ludwigia sphwrocarpa Elliot, Bot. S. C. and Ga. I. 213. 1817 [Orangeburgi, 

 S. Carolina]. — Willis 24. — Britton 109. — Keller and Brown 232. 



