Alternanthera philoxeroides

Scrambling, stoloniferous, aquatic or terrestrial perennial to 50 cm high, glabrous, stems hollow, to 10 m long, rooting at nodes. Leaves obovate to narrowly elliptic, 20–70 mm long, 10–20 mm wide; margins entire. Flowers in axillary or terminal subglobose spikes, 8–10 mm long, pedunculate; peduncle to 5 cm long; bracts and bractoles ovate, acute to accuminate, c. 3 mm long; tepals equal, elliptic, 4–6 mm long, white; anthers 5, staminodes 5. Fruit not seen. Flowers Sept.–Mar.