PliA^NTS OF SOUTHERN NEW JERSEY. 173 



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

 merged when the tide is high. 



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

 before September. 



Middle District. — Camden, Fish House, Bridgeport. 



Family VALUSNERIACE^. 



Several submerged aquatic plants with flowers that reach the 

 surface of the water on slender scapes. 



Key to the Species. 



a. Leaves short (5-10 mm.), whorled or opposite. Philotria, p. 173 



aa. 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. 1753 [Pisa, Italy]. — Knieskern 

 30. — Britton 229. 



Larger streams of the North and Middle districts. 



Fl. — July to September (apparently). 



Middle District. — Bordentown, Delaire, Cooper's Creek, Timber Creek, 

 Westville. 

 Coast Strip.— Tt. 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. 1807 [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., 1900, p. 657) is 

 obviously Zostera marina. 



