Genus i. 



BUR-REED FAMILY. 



7 1 



4. Sparganium lucidum Fernald & Eames. 

 Shining-fruited Bur-reed. Fig. 164., 



Sparganium lucidum Fernald & Eames, Rhodora 9 : 

 87. 1907. 



Stem stout, 2°-3i° high; leaves i°-2° long, 

 strongly keeled, il"-6" wide ; bracts similar to 

 the leaves but shorter; inflorescence simple or 

 somewhat branched, with the branches, or heads, 

 axillary, the main axis bearing 2-4 sessile pistil- 

 late heads and 6-10 staminate heads, the branches, 

 when present, bearing 1 pistillate head and some- 

 times 1-4 staminate heads; fruiting heads about 

 IS" in diameter; nutlets olive-brown, shining, the 

 body fusiform, about 4" long; stigma linear, 

 ii"-i|" long. 



In ponds and streams, Massachusetts to New York, 

 Illinois and Missouri. July-Sept. 



5. Sparganium simplex Huds. Simple- 

 stemmed Bur-reed. Black-weed. Fig. 165. 



Sparganium erectum /3 L. Sp. PI. 971. 1753. 

 Sparganium simplex Huds. Fl. Aug. ed. 2. 401. 1788. 



Stem rather stout, ii°-2° high; leaves ii°-3° 

 long, triangular-keeled, 4"-8" wide; bracts flat or 

 slightly keeled; inflorescence usually simple, the 

 pistillate heads 2-5, at least some of them supra- 

 axillary, the lower 1 or 2 peduncled, the staminate 

 heads 4-8; fruiting heads about 15" in diameter; 

 nutlets brown or sometimes greenish-brown, the 

 body fusiform, 2i"-3" long, often constricted at 

 the middle; stigma linear, about 1" long. 



In lakes and streams, Quebec and Ontario, and in 

 Washington and British Columbia. Also in Europe 

 and Asia. July-Sept. 



6. Sparganium chlorocarpum Rydb. 



Green-fruited Bur-reed. Fig. 166. 



Sparganium chlorocarpum Rydb. N. A. Fl. 17 1 : 8. 

 1909. 



Stem slender, i°-2° tall, or sometimes floating; 

 leaves i°-2° long, at least the middle ones keeled, 

 ii"si" wide ; bracts similar to the leaves, slightly, 

 if at all, dilated or scarious at the base; inflores- 

 cence simple, the pistillate heads 2-4, sessile or 

 the lowest one peduncled, the staminate heads 3-7 ; 

 fruiting heads io"-I2" in diameter : nutlets green, 

 rather dull, the body fusiform, 2"-2.\" long; 

 stigma less than 1" long. 



In marshes and rivers, western New York to Iowa 

 and Indiana. July-Sept. 



