Baumea rubiginosa
Spikelets in broad-ovoid to subglobular clusters on arcuate to ascending peduncles, greyish-brown to reddish-brown, usually with 3 flowers but sometimes reduced to 2. Nut smooth. Leaves sub-terete to compressed, sometimes sub-septate. Glumes usually ciliate. Rhizomatous perennial up to 1 m high. Widespread. Damp places