Perennial glabrous herbs, trailing and rooting at nodes (T. fluminensis) or branches erect. Leaves with basal sheath hyaline, 5–10 mm long, ciliate distally; petiole up to c. 2 mm long; lamina ovate to narrowly ovate, 3–6.5 cm long, 1–2.5 cm wide, green above and below, glossy. Inflorescence subtended by 2 unequal leaf-like bracts. Sepals green, 6–8 mm long, ± hairy along outer midrib; petals spreading, white, 7–10 mm long, delicate; stamens 6. Fruit a 3-chambered capsule usually with 6 seeds.
65 species from the Americas, 1 naturalised in Victoria.