SPARGANIACEAE. 



Vol. I. 



7. Sparganium divers if olium Graebner. 

 Various-leaved Bur-reed. Fig. 167. 



Sparganium diversifolium Graebner, Schrift. Nat. 

 Ges. Danzig. II. 9: 335. 1895. 



Stem rather stout, i°-3° high; leaves narrow, 

 li"-2i" wide, abruptly pointed, the lower ones 

 flat, the upper ones convex on the back or sharply 

 keeled near the base; bracts similar to the upper 

 leaves ; inflorescence simple, often nodding at the 

 tip, the pistillate heads 1-3, distant, the staminate 

 heads 1-6, distant; fruiting heads 10" in diameter; 

 nutlets grayish-brown, the body prominently- 

 nerved, obovoid; stigma linear-lanceolate. 



In bogs, Newfoundland, New Hampshire and Min- 

 nesota. Also in Europe. July-Sept. 



8. Sparganium acaule (Beeby) Rydb. Stem- 

 less Bur-reed. Fig. 168. 



Sparganium simplex acaule Beeby; Macoun, Cat. Can. 



PI. 5: 367. .1890. 

 Sparganium diversifolium acaule Fernald & Eames, 



Rhodora 9: 88. 1907 

 Sparganium acaule Rydberg, N. A. FI. 17 1 : 8. 1909. 



Stem rather slender, J°-i° high; leaves very nar- 

 row, i"-2" wide, triangular-keeled ; bracts nearly 

 similar to the leaves, but dilated and with broad 

 scarious margins at the base; inflorescence simple, 

 erect, the pistillate heads solitary or 2 or 3, and 

 approximate, usually sessile, supra-axillary, the stam- 

 inate 2-4, less crowded than the pistillate ones; fruit- 

 ing heads 7"-8" in diameter ; nutlets olive-brown, the 

 body not nerved, fusiform, ll'-2" long. 



In swamps and on muddy shores, Newfoundland to 

 Iowa, South Dakota and Virginia. July-Sept. 



9. Sparganium multipedunculatum (Morong) 

 Rydb. Many-stalked Bur-reed. Fig. 169. 



Sparganium simplex multipedunculata Morong, Bull. 



Torrey Club 15: 79. 1888. 

 Sparganium multipedunculatum Rydb. Bull. Torrey Club 



32: 598. 1905. 



Stem i°-i§° high or less, or floating, rather slen- 

 der; leaves narrow, 2j"-s" wide or rarely less, 

 slightly keeled, dilated and scarious-margined at the 

 base; bracts similar to the leaves, but relatively more 

 dilated at the base; inflorescence usually simple, the 

 pistillate heads 2-5, the lower 1 or 2 decidedly pedun- 

 cled, some of them supra-axillary, the staminate 

 heads 3-5, approximate to each other,' but usually 

 distant from the nearest pistillate one; fruiting 

 heads f-10" in diameter; nutlets brown, the body 

 fusiform, about 2" long; stigma linear, about 1" 

 long. 



In ponds and marshes, Mackenzie to western On- 

 t 3 ? ',- CoIor ado, British Columbia and California. 

 July-Sept. 



