Journal of the Elisha Mitchell Society 76: 76, fig. 3, map 5. 1960.
Herbs, perennial, to 35 cm; rhizomes absent; stolons present; corms present. Leaves submersed and emersed; submersed phyllodial, flattened, 9.5–16.5 × 0.6–1.5 cm; emersed with petiole nearly terete, 3–25 cm, blade linear-lanceolate to ovate, 5.5–8.5 × 0.5–2.1 cm. Inflorescences racemes, of 2–5 whorls, emersed, 4.5–15 × 2–6 cm; peduncles to 35 cm; bracts connate ¼ total length, lanceolate, 2–4.5 mm, delicate, not papillose; fruiting pedicels spreading to recurved, cylindric, 1.5–4.5 cm. Flowers to 1 cm diam.; sepals appressed to spreading, not enclosing flower or fruiting head; filaments dilated, ± equaling anthers, glabrous; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 0.5–0.6 cm diam; achenes obovoid, abaxially keeled, 2.5–3 × 1.2–1.5 mm, beaked; faces not tuberculate, wings 1, ± entire, glands 0–1; beak lateral, horizontal, ca. 0.5 mm.
Phenology: Flowering spring–summer.
Habitat: Swamps, bogs, and wet roadside ditches
Elevation: 250–1000 m
Of conservation concern.