200 



Cyperaceae 



Eleocharis 



50 



Map 382 



Eleocharis Rob bin si i Oakes 



o 50 



Map 383 



Eleocharis oh vacea Torr. 



50 



Map 384 



Eleocharis geniculate (U R. & S. 



1. Eleocharis equisetoides (Ell.) Torr. (Eleocharis interstincta of 

 authors.) Knotted Spikerush. Map 380. In shallow water on the sandy 

 bottoms of some of our northern lakes. 



Mass. to Fla. and Tex. and inland to Mich., Wis., and Mo. 



2. Eleocharis quadrangulata (Michx.) R. & S. var. crassior Fern. 

 (Rhodora 37: 393. 1935.) (Eleocharis mutata of Britton and Brown, 

 Illus. Flora, ed. 2, not Scirpus mutatus L. and Eleocharis quadrangulata 

 of Indiana authors, not Scirpus quadrangulatus Michx.) Angled Spike- 

 rush. Map 381. In sandy or mucky soil in shallow water or on the 

 borders of lakes, ponds, and sinkholes. 



Mass. to s. Ont., southw. to Ga., Tex., and Mexico. 



3. Eleocharis Robbinsii Oakes. Robbins Spikerush. Map 382. In 

 marly soil on the borders of lakes. This species apparently does not fruit 

 every year and it may be more frequent in Indiana than our records 

 indicate. 



N. S. and s. N. B. to Fla., chiefly along the Coastal Plain, and westw. 

 through cent. N. Y. to Mich., Ind., and Ont. 



4. Eleocharis olivacea Torr. (Eleocharis flaccida (Reichenb.) Urban 

 var. olivacea (Torr.) Fern. & Grisc. Rhodora 37: 155. 1935.) Bright 

 Green Spikerush. Map 383. Wet, sandy or muddy, marl borders of 

 lakes. 



N. S., Ont. to Mich., southw. to Fla., Pa., Ohio, and Ind. 



5. Eleocharis geniculata (L.) R. & S. (Rhodora 41: 50-52. 1939.) 

 (Eleocharis capitata R. Br. and Eleocharis caribaea (kottb.) Blake.) Map 

 384. In wet, marl borders of lakes and in dried-up sloughs. In addition 

 to the counties shown on the map, it is known in the Great Lakes area 

 only from Washtenaw County, in southeastern Michigan and from south- 

 ern Ontario. 



