Pittonia 2: 158. 1890.
Herbs, perennial, to 130 cm; rhizomes present; stolons absent; corms present. Leaves emersed, sessile, phyllodial, lenticular, or with petiole triangular, to 53 cm, blade lance-elliptic, 11–18 × 1.5–4.5 cm. Inflorescences racemes, of 3–9 whorls, emersed, 2–13.5 × 3–6 cm; peduncles to 75 cm; bracts connate more than ¼ total length, lanceolate, 5–8 mm, delicate, not papillose; fruiting pedicels recurved, cylindric, 0.5–2.5 cm. Flowers to 3.5 cm diam.; sepals spreading in staminate, erect in pistillate, enclosing flower or fruiting head; filaments club-shaped, longer than anthers, pubescent; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 0.7–1.2 cm diam.; achenes oblanceoloid, abaxially keeled, 2–3 × 1.4–2.1 mm, beaked; faces not tuberculate, wings absent, glands 0–1; beak lateral, erect, 0.2–0.6 mm. Chromosome number unknown.
Phenology: Flowering summer (Jul–Sep).
Habitat: Ditches, streams, and lake margins
Elevation: 10–300 m
Of conservation concern.