Flora of New Zealand Series

Wolffia , water meal, was first recorded in 1949 from N.Z. (Palmerston North, Ohau R., Waikanae Estuary, Washdyke Lagoon) by R. Mason (Bull. Wellington Bot. Soc. No. 21, 10-11) as W.arrhiza (L.) Wimmer. N.Z. and Australian material has been recently separated as W. australiana (Benth.) den Hartog et van der Plas (Blumea 20, 1972, 151), based on W. arrhiza var. australiana Benth. (Fl. Aust. 7, 1878,162).