Compilation
Sparganium fluctuans

Plants limp, to more than 1 m long; leaves and inflorescences floating. Leaves limp, unkeeled, flat, mostly 0.6--1 m  4--10 mm. Inflorescences: rachis 0--2-branched, distal part erect at water surface; bracts ascending, not inflated at base; pistillate heads 0--2 on main rachis, 1--2 on secondary rachises, axillary or supra-axillary, often some contiguous or nearly so, especially in fruit, sessile, 1.5--2.3 cm diam. in fruit; staminate heads 3--6 on main rachis, 1--4 on secondary rachises, contiguous or not, but not contiguous with distalmost pistillate head. Flowers: tepals often with prominent apical dark spot, apically erose to fimbriate; stigmas 1, linear-lanceolate. Fruits eventually dark reddish brown, dull, stipitate, elliptic to obovoid or fusiform, body not faceted, sometimes constricted near equator, 2--5  1.5--2 mm, tapering to beak; beak curved, 2--3.5 mm; tepals borne at middle of fruit stipe, basally adnate to stipe, reaching about nearly to equator. Seeds 1.