Baumea teretifolia (R.Br.) Palla

Spikelets in ovoid to narrow-ovoid clusters on erect peduncles, black to reddish-brown, often with 2 flowers but sometimes reduced to 1. Nut deeply wrinkled. Leaves usually terete but sometimes compressed, ± subseptate. Rhizomatous perennial up to 80 cm high. Widespread. Damp places