Helosciadium nodiflorum

Semi-aquatic or aquatic perennial to 1.5 m high, rooting at lower nodes. Leaves with 3–17 pinnae, to 70 cm long and 10 cm wide; pinnae ovate to lanceolate, 1–4 cm long, to 2.5 cm wide, serrate or crenate, sometimes lobed. Umbels 2–4 cm diam.; rays 4–14, 2–3 cm long; bracts 0–2; bracteoles 4–8, narrowly lanceolate, equalling or exceeding pedicels, margins white. Fruit ovoid, 1.5–2.5 mm long. Flowers Nov.–Feb.