Hydrocotyle novae-zelandiae DC. (New Zealand) – A very rare turf weed, known since 1984 from the Zoo in Antwerpen (Billiet 2004). Fully naturalised, locally spreading and apparently herbicide resistant.
Hydrocotyle novae-zelandiae is offered for sale as an ornamental (ground cover) but at its unique Belgian location it was probably brought in unintentionally.
The British collections belong with var. montana Kirk. (Clement & Foster 1994), distinguished by small, coriaceous, glabrous leaves (Allan 1961).
Allan H.H. (1961) Flora of New Zealand, vol. 1. Government Printer, Wellington: 1085 p.
Billiet F. (2004) Hydrocotyle novae-zelandiae dans le jardin zoologique d’Anvers, nouveau pour la Belgique. Dumortiera 82: 26-27.
Clement E.J. & Foster M.C. (1994) Alien plants of the British Isles. BSBI, London: XVIII + 590 p.
Webb C.J. (1990) New Zealand species of Hydrocotyle (Apiaceae) naturalised in Britain and Ireland. Watsonia 18: 93-95.