Xyris complanata R.Br.

Peduncle flattened, 1–2.5 mm diam., 20–60 cm long. Leaves linear, 5–30 cm long 1–4 mm wide. Flower heads ovoid to cylindrical, 1–2.5 cm long, 7–10 mm diam. Widespread. Damp places. Fl. spring–summer