258 REPORT OF NEW JERSEY STATE MUSEUM. 



f. Spikes 2 mm. broad, scales reddish brown, with a green 

 mid-vein. E. olivacea. p. 259 



ff. Spikes 2-3 mm. broad, scales very pale. 



E. ocreata. p. 259 



Eleocharis interstincta (Vahl.). Knotted Spike-rush. 

 PI. XVII., Fig. 5- 

 Scirpus intcrstiitctus Vahl, Emun. II. : 251. 1806 [Caribaeis]. — Keller and 

 Brown 61.— Stone, Proc. Acad. Nat. Sci., Phila., 1908. 458. 



Known only from a swamp at Repanpo in the Middle district, 

 where it was first disco\-ered by Benjamin Heritage, July 15, 

 1892. 



Fr. — ]\Iid-Jnly to late August. 

 Middle District. — Repaupo. 



Eleocharis quadrangulata Michx. Quadrangular Spike-rush. 

 PI. XVII., Fig. 6. 

 Scirpus qiiadrangulatus Michaux, Fl. Bor. Am. I. 30. 1803 [Carolina]. 

 Eleocharis quadrangulata Torre}', Ann. Lye. N. Y. III. 297. 1836. — Willis 



68. 

 Eleocharis mutata Britton, Jour. N. Y. Micros. Soc. V. 98. 1889.— Britton 

 262. — Keller and Brown 62. 



Found in our region only in wet swamps in the Cape May 

 district, but occurs also at Swartswood Lake, Sussex Co. 

 Fr. — ]Mid-July to mid-August. 

 Cape May. — Dennisville, Dias Creek, Bennett, Cape May. 



Eleocharis robbinsii Oakes. Robbin's Spike-rush. 

 PI. XVII., Fig. 7- 

 Eleocharis Robbinsii Oakes, Hovey's Magazine VII. 178. 1848 [Pondi- 

 cherry pond, Tefiferson, N. H.].— Willis 67.— Britton, Jour. N. Y. Micros. 

 Soc. V. 99. 1889.— Gray Manual Ed. V. 557. 1867.— Britton 262.— 

 Keller and Brown 62. 



Growing in the water in Pine Barren streams and ponds, 

 frequent; rare and local in similar situations in the Middle 

 district. 



pr. — Mid-July to mid- September, good fruit somewhat infre- 

 quent. 



Middle District. — Delanco, Union Grove (S), Fairton. 



Pine Barrens.— Toms River, Forked River, Dover Forge, Pasadena, Pleas- 

 ant Mills, Mullica River, Quaker Bridge, Chatsworth, Hammonton, Berlin, 

 Browns Mills (H), Dennisville. 



Cape May. — Town Bank. 



