128 



were measured than from elsewhere. Since from southern New- 

 Jersey southward there are trees with the leaves 15 cm. or more 

 long and since this length previously has been used as the dividing 

 line, it might be considered as the arbitrary median between the 

 two populations which the writer prefers to consider as subspecies. 



Length of sheaths" has been ignored because its variation seems 

 directly proportional to the variation in the leaves. Sheaths sub- 

 tending long leaves are proportionally longer than those subtending 

 short leaves. As a taxonomic character in this group, sheath- ■ 

 length is really a repetition of leaf -length. 



Specimens typical of ssp. scrofina have been seen from three 

 counties in southern New Jersey. Cape May Co. : Cold Spring, 

 Bayard Long 5744 (Ph). Cumberland Co.: Ocean View, Henry 

 Fox (Ph), this collection is on the border-line. Gloucester Co.: 

 Swedesboro, Bayard Long (NY), also B. H. Smith & C. D. Lip- 

 pincott (Ph). 



Although specimens from low elevations from southern New 

 Jersey to North Carolina collectively are intermediates, yet in any 

 region there are likely to be trees which are more one way than 

 the other. New Jersey collections which are in the middle, true 

 intermediates, are cited from two counties. Cape May Co. : West 

 Cape May, W . C. Wilson, J. Tanner, and C 2349 (BH, Corn) ; 

 Cape May Court House, Witmer Stone 11742 (Ph) ; Nummytown, 

 S. S. Van Pelt & Witmer Stone (Ph) ; Cold Spring, O. H. Brown 

 (Ph) ; Dennisville, W. Stone 7473 (Ph) ; Cape May Point, C. A. 

 Williamson (Ph). Cumberland Co.: Dividing Creek, F. W. Pen- 

 nell 14870 (Fh). 



PoTAMOGETON ANGUSTiFOLius Berch. & Presl. Morris Co. : 

 rooted on muddy bottom on west side of Budd Lake, E, C, ct al 

 1737 (Corn). 



Taylor (1915) reported this only from Sussex and Warren 

 Counties. The writer has seen no other New Jersey collections. 



PoTAMOGETON CAPiLLACEUS Poiret. Middlesex Co. : shallow 

 backwater of Lawrence River about one mile southwest of Mill- 

 town, E & C 1731. Morris Co.: on sandy bottom at southern end 



^ In this discussion, only sheaths still intact are considered. The breaking 

 away of the sheath in old leaf-clusters causes this character to vary tre- 

 mendously, with the result that the oldest leaves may have the shortest 

 sheaths. Statements made apply to leaf-clusters of the same age. 



