Tetrarrhena R.Br. >
Inflorescence a simple spike (Fig. 49 b) Tetrarrhena
Leaf blades tightly involute around the culm, smooth, up to 1 mm wide. Inflorescence mostly less than 3 cm long. Densely tufted rhizomatous perennial up to 1.3 m high. Widespread. Swamps and along creek banks. Fl. spring–summer Tetrarrhena turfosa