Erect, emergent, perennial herb, rooting in substrate; rhizome tuberous. Leaves erect, emergent; petiole 0.5–1 cm wide, with slightly expanded, membranous wings basally; lamina linear (not Victoria), narrowly elliptic to ovate. Inflorescence erect, panicle-like, with flowers arranged in several successive pseudowhorls which are separated by a long axis; each pseudowhorl of 3–8(–12), flowers and each flower subtended by a bract. Flowers bisexual; inner perianth whorl longer than outer; outer perianth green; inner perianth pale pink; stamens 6, ± in pairs opposite outer perianth lobes; carpels c. 18–20, free. Aggregate fruit of 1-seeded achenes.
9 or 10 species, cosmopolitan; 1 native species and 1 naturalised species in Australia and Victoria.