Pseudoraphis spinescens (R.Br.) Vickery

Panicle spreading, 5–9 cm long. Spikelets distant on filiform branches, obtuse. Lower glume less than 1 mm long. Stems creeping or floating in water. Leaf blades flat, 4–5 cm long. In or near water. Fl. summer. Floating Couch or Mudgrass