Leersia hexandra

Rhizomatous perennial, culms to 1.5 m high, plants often forming swards in or near water and rooting from submerged nodes. Leaf-blades flat, to 20 cm long and 10(–15) mm wide, prominently veined, glabrous but distinctly scabrous on upper surface; ligules firm, 1.5–3 mm long. Inflorescence narrow to somewhat spreading, to 15 cm long, at least initially enclosed at base by upper leaf-sheath, branchlets weakly or barely flexuose. Spikelets 3–4.5 mm long, shortly pedicellate; lemma 5-nerved (3 obvious, 2 submarginal), scabrous-ciliate along keel, scabrous on lateral and submarginal nerves, internerves smooth or sparsely scabrous; palea 3-nerved, keeled, loosely clasped by narrowly incurved lemma margin, hispid along keel; anthers 6, c. 2 mm long. Flowers Feb.–May.