Erect, much-branched and spreading flowerheads with narrowly-oval spikelets. Glumes are pointed, lemmas yellowish-green rough, blunt, oval. Flat, +/- folded leaves with rough sheaths and ligules. A tall, erect grass spreading by rhizomes and forming dense stands in suitable habitats. Height 60-200cm.
Found in and beside lakes, rivers, ditches and ponds, where it can form floating rafts. Most frequently recorded from the eastern half of Ireland.
Similar: Reed Canary-grass, Phalaris arundinaceae
Reed Sweet-grass. Co. Wexford. September 2010