64 SPARGANIACEAE. 
y 2. Sparganium androcladum (Engelm. ) 
X Morong. Branching Bur-reed. (Fig. 139.) 
“ Sparganium nee a var. androcladum Engelm. in A. 
Gray, Man. Ed. 5, 481. 1867. 
Sparganium androcladum Morong, Bull. Torr. Club, 15: 
78. 1888, 
7 é 
Stem slender, more or less branching, 10’-2° high. 
Pistillate heads 3-7, sessile or the lowest peduncled, 
axillary or the peduncles and branches axillary; style 
I; stigma 1 (rarely 2); fruiting heads 6/’-12” in di- 
ameter; nutlets fusiform, 2’’-3’’ long, 114’ 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 1’ long or more. 
_ In bogs or shallow water, Nova Scotia to Ontario and Brit- 
ish Columbia, south to Florida and Louisiana. June-Aug. 
Sparganium androécladum fluctuans Morong, Bull. Torr. 
Club, 15:78. 1888. 
Sparganium simplex Var, fluttans Engelm, in A. Gray, 
Man. Ed.5, 481. 1867. Not Sparganium fluitans Fries. 
Floating in deep water with long slender stems, and thin leaves 1''-3's"' wide; inflorescence 
usually sparingly branched; fruiting heads 4’'-6'' in diameter. In cold ponds, New Brunswick to 
Pennsylvania. 
3. Sparganium simplex Huds. Simple- 
stemmed Bur-reed. (Fig. 140.) 
Sparganium simplex Huds. Fl. Angl. Ed. 2, 401. 1788. 
Stem slender, 1%4’—24’ high, simple. Leaves more 
or less triquetrous, 2’’-4’’ wide ; inflorescence 10//-S’ 
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 
1’’ 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, '4'’-1!s'' wide, their sheaths often inflated vat the 
base; staminate and pistillate heads 1-4; fruiting heads 3/'-7"’ in 
diameter. In mountain lakes and slow streams, New foundiand 
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, %’/-214’’ wide ; inflorescence 1’ 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, 1’’-2’’ long, twice 
as long as the denticulate scales ; stigma oval, often oblique, 
about as long as the style; stalk of the nutlet //—'s’’ 
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- 
em Europe. Dwarf forms, growing out of water, sometimes 
occur with stems 3’-6’ high. June-Aug. 
