Erect aromatic herbs (scent similar to that of Lycopus australis), to 140 cm high; rhizomes long, to 20 mm diam. Stems several per node, warty near base. Leaves ovate, 2–17 cm long, 1–10 cm wide; petiole to 1–10 cm long; base cordate; apex acuminate. Inflorescence usually drooping, 5–35 cm long; rachis white; bracts white or green, 1.5–3.0 mm long, fused to pedicel. Schizocarps brown, 1.5–3 mm long, rugose. Seeds brown, smooth. Dec.-Jan.
VVP. Native to North America. Known from a single population in Australia, growing in shallow water near the edge of artificial lake in the suburb of Broadmeadows, where first collected in 2012.
