GENUS i. 



BUR-REED FAMILY. 



7 1 



4. Sparganium lucidum Fernald & Eames. 

 Shining-fruited Bur-reed. Fig. 164. 



Sparganiuin lucidum Fernald & Eames, Rhodora 9: 

 87- i97- 



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

 strongly keeled, i$"-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 i pistillate head and some- 

 times 1-4 staminate heads ; fruiting heads about 

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

 body fusiform, about 4" long; stigma linear, 

 ii"-if" 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 i$-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 i or 2 peduncled, the staminate 

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

 nutlets brown or sometimes greenish-brown, the 

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

 the middle; stigma linear, about i" 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' : 8. 

 1909. 



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

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

 i $"-34" 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 i" long. 



In marshes and rivers, western New York to Iowa 

 and Indiana. July-Sept. 



