Part 1, 1909] SPARGANIACEAE 9 
stalked ; staminate heads 2-4; fruiting heads about 1.5 cm. in diameter; sepals spatulate, 
erose at the apex, without distinction between blade and claw; achenes dark olive-brown, 
not nerved ; stipe 1-2 mm. long; body fusiform, 3-4 mm. long, usually decidedly constricted 
at the middle ; beak 1.5-2 mm. long; stigma about 1 mm. long; anthers about 1 mm. long 
and one fourth as thick. 
TYPE LOCALITY: Lake Verde, Prince Edward Island. 
iS fo : Muddy shores and swamps, from Newfoundland to Virginia, Iowa, and South 
akota. 
11. Sparganium multipedunculatum (Morong) Rydb. Bull. 
Torrey Club 32: 598. 1905. 
Sparganium simplex multipedunculata Morong, Bull. Torrey Club 15: 79. 1888. 
Sparganium subvaginatum Meinsh. Mél. Biol. Acad. St. Petersb. 13: 390, in part. 1893. 
Perennial, with a creeping rootstock; stem erect or sometimes floating, 3-5 dm. high, 
rarely only 1-2 dm. high; leaves 3-5 dm. long, 5-10 mm. (rarely 3-4 mm.) wide, of a firm 
texture, slightly keeled, dilated and scarious-margined towards the base, acute; bracts 
similar but still more dilated at the base ; inflorescence usually simple; pistillate heads 2-5, 
the lower 1 or 2 decidedly peduncled, some of them supra-axillary ; staminate heads 3-5, usu- 
ally distant from the pistillate ones, but close to each other, the uppermost usually con- 
fluent ; fruiting heads 1.5-2 cm. in diameter; sepals distinctly clawed, the blades spatulate, 
erose at the apex; achenes brown; stipe2-2.5 mm. long; body fusiform, about 4mm. long; 
beak 2.5-3 mm. long; stigma linear, about 1 mm. long; anthers about 1 mm. long, about 
one third as broad. 
TYPE LOCALITY: Great Falls, Montana. 
DISTRIBUTION: Ponds and marshes from British Columbia to California, Colorado, western 
Ontario, and Mackenzie. 
12. Sparganium angustifolium Michx. Fl. Bor. Am. 2: 189. 1803. 
Sparganium natans angustifolium Pursh, Fl. Am. Sept. 34. 1814. 
Sparganium simplex angustifolium Torr. Fl. N. Y. 2: 249. 1843. 
Sparganium natans affine A. Gray, Man. ed. 2. 430. 1856. 
Sparganium affine Macoun, Cat. Can. Pl. 4: 71. 1888. Not S. affine Schnizl. 1845. 
Sparganium subvaginatum Meinsh. M61. Biol. Acad. St. Petersb. 13: 390, in part. 1893. 
Perennial, with a rootstock, usually somewhat thickened at the base of the stem; stem 
slender, in deep water floating, 3-12 dm. long, in shallow water occasionally erect, 2-3 dm. 
high; leaves 3-6 dm. long, 3-4 mm. wide, dark-green, cellular-reticulate beneath; lower 
bracts 1-2 dm. long, dilated and sometimes slightly scarious-margined below; the upper 
bracts short, lanceolate or ovate, 1-2 cm. long; peduncles usually arcuate-flexuose; pistillate 
heads 2-4, the lower 1 or 2 usually on supra-axillary pedicels 1-3 cm. long, the upper 
distant, in fruit about 1.5 cm. in diameter; sepals spatulate, short-clawed, erose at the 
apex, nearly two thirds as long as the achenes; achenes dirty-brown with reddish-brown 
bases, stipitate, beaked, constricted at or above the middle, abruptly contracted above; 
stipe about 1.5mm. long; beak about 2 mm. long; stigma usually less than 1 mm. long; 
staminate heads 1-6, sometimes confluent with each other but distant from the pistillate 
ones; anthers oblong-clavate, 1 mm. long, 3-4 times as long as broad. 
TYPE LOCALITY: Canada. 
DISTRIBUTION: Ponds and slow streams, from Newsoundland to Connecticut, Pennsylvania, 
Colorado, California, and British Columbia. 
ILLUSTRATIONS: Bull. Torrey Club 15: f/. 79, f. 8; Britt. & Brown, Ill. Fl. f. 240 (as S. simplex). 
13. Sparganium fluctuans (Morong) B. L. Robinson, Rhodora 7:60. 1905. 
Sparganium simplex fluitans Engelm.; A. Gray Man. ed. 5. 481. 1867. 
Sparganium androcladum fluctuans Morong, Bull. Torrey Club 15: 78. 1888. 
Perennial, with a rootstock and numerous roots at the base of the stem; stem slender, 
floating, 3-15 dm. long; leaves only slightly if at all carinate, 3-6 dm. long, 3-11 mm. wide, 
cellular-reticulate ; bracts 3-12 cm. long, dilated and somewhat scarious-margined towards 
the base ; inflorescence usually branched ; branches usually with 1 pistillate and 2 staminate 
heads, the main axis with 2-4 staminate heads; fruiting heads about 2 cm. in diameter; 
sepals spatulate, erose at the apex, almost without a distinction between blade and claw; 
body of the brown achenes fusiform, sometimes constricted at the middle; stipe short; beak 
