PUANTS OF SOUTHERN NEW JERSEY. 173 



caulon parkeri, etc;, exposed at low tide and completely sub- 

 merged when the tide is high. 



Fl. — Late July to late August. Fr. — .Fully mature very rarely 

 before September. 

 Middle District. — Camden, Fish House, Bridgeport. 



Family VALLISNERIACE^. 



Several submerged aquatic plants with flowers that reach the 

 surface of the water on slender scapes. 



Key to the Species. 



a. Leaves short (s-io mm.), whorled or opposite. Philotria, p. 173 



ad. Leaves long and narrow and grass-like, pistillate flowers on filiform 



scapes (6-12 dm. long), later coiling spirally, staminate flowers detached, 



floating. Vallisneria, p. 173 



aaa. Leaves heart-shaped, broad and spongy, petioled. Limnobium, p. 173 



PHILOTRIA Rafinesque. 

 Philotria nuttallii (Planch.). Water Weed. 



Anacharis Nuttallii Planchon, Ann. Mag. Nat. Hist. H. i. 86. 1848 [North 

 America] . 



Ponds and streams North and Middle districts. 

 Fl. — ^June to August (probably). 



Middle District. — New Egypt, Delair, Camden, Cooper's Creek, Paulsboro, 

 Repaupo, Swedesboro. 



VALLISNERIA L. 



Vallisneria spiralis L.. Wild Celery. Tape Grass.* 



Vallisneria spiralis Linnaeus, Sp. PI. 1015. I7S3 [Pisa, Italy] .—Knieskern 

 30. — Britton 229. 



Larger streams of the North and Middle districts. 

 Fl. — ^July to September (apparently). 



Middle District.— BorAe.nto^x\, Delaire, Cooper's Creek, Timber Creek, 

 Westville. 

 Coast Strip.— Ft. Pleasant (NY), Island Hts. (NY). 



LIMNOBIUM L. C. Richard. 

 Limnobium spongia (Bosc). Frog's Bit. 



Hydrocharis Spongia Bosc, Ann. Mus. Paris IX. 396. PI. 30- i8o7 [South 



Carolina] . 

 Limnobium spongia Knieskern 30.— Willis 60.— Britton 329.— Keller and 



Brown 26. 



*The plant referred to by Harshberger under this name as abundant on 

 the shore of Barnegat Bay (Proc. Acad. Nat. Sci., Phila., igoo, p. 657) is 

 obviously Zostera marina. 



