PUANTS OF SOUTHERN NEW JERSEY. 169 



/=■/.— Early July to late August. Fr.— Early August to early 

 October. 



Middle District.—liew Egypt, Delanco, Delair, Swedesboro. 



Coast Strip.— Anglesea. (UP). 



Cape May.—E. of Court House, Wildwood Jnc, Bennett, Cape May. 



HELIANTHIUM Engelmann. 



Helianthium parvulum (Engelm.). Dwarf Water Plantain. 



Echinodorus parvulus Engelmann in A. Gray Manual Ed. 2. 438. 1856 



[Michigan]. 

 Alisma tenellum Stone, Proc. Acad. Nat. Sci. igo8, 457. 



This delicate little plant was apparently unknown from New 

 Jersey until August 10, 1907, when it was discovered by the 

 writer in company with Messrs. Stewardson Brown and Samuel 

 S. Van Pelt on the edge of Nelly's Pond, north of Delanco. 



Fl. — ^Late July to late August. Pr. — Mid-August to mid- 

 September. 



Middle District. — Delanco. 



SAGITTARIA L. 

 Sagittaria latifolia Willd. Common Arrow-head.* 



Sagittaria latifolia Willdenow, Sp. PI. IV. 409. 1806 [Canada to Carolina], 



Sagittaria variabilis Knieskern 30. 



Sagittaria sagittafoUa formae obtusa latifolia et hastata. — Britton, p. 255. 



This is the common Arrowhead of the Middle district, especi- 

 ally along the Delaware and oDher larger streams and their tribu- 

 taries and also in the northern counties. While it has not been 

 found on the coast it does occur on the lower Egg Harbor River 

 along with species that have evidently worked their way inland. 



* Lophotocarpus spongiosus Engelmann (in Gray Man. Ed. 5. 493. 1867) 

 is included in Britton's Catalogue from tidal mud in the Delaware, Camden 

 Co., N. J., authority of Mr. Chas. F. Parker. Mr. Parker's specimens, 

 preserved with the rest of his herbarium at Princeton University, represent 

 a plant that has been frequently collected at the above locality, and is well 

 represented in the Academy herbarium. It has been generally, and I think 

 rightly, regarded as a submerged form of Sagittaria graminea. The flower- 

 ing scapes are 5-6 in. long, with very small flowers on pedicels J^-J^ in. long. 

 The leaves are 2-3 in. long, tapering to a point and about }i in. wide near 

 the base. I have never seen any fruiting specimens. The plant is certainlv 

 not Lophotoca/rpus. 



