SPARGANIACEAE. 



2. Sparganium androcladum (Engelm.) 

 Morong. Branching Bur-reed. (Fig. 139.) 



Sparganium simplex var. androcladum Engelm. in A. 



Gray, Man. Ed. 5, 481. 1867. 

 Sparganium androcladum Morong, Bull. Torr. Club, 15: 



78. 1888. 



Stem slender, more or less branching, io / -2 high. 

 Pistillate heads 3-7, sessile or the lowest peduncled, 

 axillary or the peduncles and branches axillary; style 

 i ; stigma i ( rarely 2 ) ; fruiting heads 6 // -i2 // iu di- 

 ameter ; nutlets fusiform, 2 // -3 // long, \y~" thick, 

 usually even, often strongly contracted at the middle, 

 tapering into the style ; scales oblong, as long as the 

 nutlets or shorter, the exterior ones narrower ; stalk 

 of fruit i " long or more. 



In bogs or shallow water. Nova Scotia to Ontario and Brit- 

 ish Columbia, s.outh to Florida and Louisiana. June-Aug. 



Sparganium androcladum fliictuans Morong. Bull. Torr. 



Club, 15: 78. 1888. 



Sparganium simplex var. fluitans Engelm. in A. Gray, 

 Man. Ed. 5. 481. 1867. ?ot Sparganium /f/f/'/awsFries. 

 Floating in deep water with long slender stems, and thin leaves i"-^" wide; inflorescence 

 usually sparingly branched; fruiting heads 4" -6" in diameter. In cold ponds, Xew Brunswick to 

 Pennsylvania. 



3. Sparganium simplex Huds. Simple- 

 stemmed Bur- reed. (Fig. 140.) 



Sparganium simplex Huds. Fl. Angl. Ed. 2, 401. 1788. 

 Stem slender, i^ / -24 / high, simple. Leaves more 

 or less triquetrous, 2 // -4 // wide ; inflorescence io // -8 / 

 long ; staminate heads 4-6; pistillate 2-6, sessile or the 

 lowest peduncled ; fruiting heads 5 "-8" in diameter ; 

 nutlets fusiform or narrowly oblong, obtusely angled 

 at the apex, more or less contracted in the middle, 

 smaller than those of the preceding species and more 

 tapering at the summit ; scales denticulate, about 

 one-half as long as the nutlets ; stigma linear, as long 

 as the style or shorter, rarely 2 ; stalk of fruit about 

 \" long. 



Borders of ponds and streams, Newfoundland to British 

 Columbia, south to Pennsylvania, Montana and California. 

 Ascends to 2500 ft. in the Catskill Mountains. June-Aug. 



Sparganium simplex angustifolium (Michx. ) Engelm. in A. Gray, Man. Ed. 5, 481. 1867. 

 Sparganium angustifolium Michx. Fl. Bor. Am. 2: 189. 1803. 



Floating in deep water. Leaves very long, l A"-\^" wide, their sheaths often inflated at the 



base; staminate and pistillate heads 1-4; fruiting heads 3" -7" in 

 diameter. In mountain lakes and slow streams. Newfoundland 

 to Oregon, south to New York and California. 



4. Sparganium minimum Fries. Small Bur- 

 reed. (Fig. 141.) 



Sparganium minimum Fries, Sum. Veg. 2: 560. 1846. 



Floating, stems very slender, 4'-3 long. Leaves thin and 

 lax, W~2 l /2 f ' wide ; inflorescence i' or more long ; stami- 

 nate heads 1-2 ; pistillate, 1-3, sessile, axillary, supra- 

 axillary or the lowest on an axillary peduncle ; ripe fruit- 

 ing heads 2"-5" in diameter ; nutlets ovoid, slightly trian- 

 gular, tapering abruptly into the style, i // -2 // long, twice 

 as long as the denticulate scales ; stigma oval, often oblique, 

 about as long as the style ; stalk of the nutlet X"-#" 

 long, often apparently none. 



In ponds and streams. New Brunswick to Manitoba and Ore- 

 gon, south to New Jersey, Michigan and Utah. Also in north- 

 ern Europe. Dwarf forms, growing out of water, sometimes 

 occur with stems J-6' high. June-Aug. 



