Alternanthera denticulata
Inner bracts 1.5–2.5 mm long. Perianth segments lanceolate, 2–3 mm long. Leaves 20–60 mm long. Flower clusters 4–8 mm diam., sessile. Fruits not much shorter than the perianth. Widespread. Margins of swamps and rivers. Weed of pastures and waste places. Lesser Joyweed