The APG II system, of 2003 (unchanged from the APG system, 1998), also recognizes this family, and assigns it to the order Poales in the clade commelinids, in the monocots. The family consists of only one genus Sparganium of less than two dozen species, perennial plants of wet habitats. By the APG III system of 2009, Sparganium had been found to be fairly closely related to Typha, and so was placed with that genus in family Typhaceae.
Stout, monoecious, rhizomatous perennial herbs rooted in mud. Stems erect, simple, without nodes, terminated by dense cylindric flower spikes. Leaves distichous, simple, linear, ± glaucous, entire, ± all basal, with long, open, but tightly clasping sheathing bases; the free part of the leaves usually twisted. Flowers unisexual, very numerous, densely crowded in a terminal spike, the male flowers in the upper part, the female flowers below. Male flowers subtended by scales or bracteoles; perianth 0 or of 3-6 small scales. Female flowers with or without bracteoles; perianth of slender hairs; abortive female flowers often present. Ovary superior, 1-locular with a solitary ovule. Fruit ellipsoid or subcylindric.
Barcode of Life Data Systems (BOLD) Stats Specimen Records:217 Specimens with Sequences:285 Specimens with Barcodes:256 Species:38 Species With Barcodes:37 Public Records:84 Public Species:18 Public BINs:0