Vascular – Exotic
Herbs - Dicotyledonous composites
The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.
Creeping herb, with crowded paired round leaves along horizontal creeping stems, rooting where leaf bearing stems touch the soil, flowers yellow, up to 2.5 cm across.
Scattered distribution, recorded from the Waikato, Bay of Plenty and Westland.
Damp places such, as river banks and low-lying pastures.
Glabrous, evergreen herb with creeping aerial stems, rooting at nodes. Lvs opposite, shortly petiolate. Lamina 1-2.5 × 1-2.5 cm, orbicular to subreniform, glandular-punctate, entire; base rounded to subcordate; apex rounded or shallowly emarginate. Fls solitary in the axils; bracts 0. Pedicels 1.5-2 cm long, glabrous. Calyx 7-8 mm long, glandular-punctate; lobes ovate or triangular-ovate, cordate at base, short-acuminate at apex. Corolla limb 2-2.5 cm diam., yellow, minutely glandular-ciliate; lobes c. 1.5 cm long, ± obovate, rounded. Stamens 4-5 mm long; filaments united at base, glandular-scaly. Style almost = or slightly > stamens, scarcely glandular-scaly. Capsule not seen.
No other creeping, opposite orbicular leaved and yellow flowered wetland plant.
November to April
Apparently no seed set in New Zealand, dispersal by stem fragments spread by water movement, deliberate planting or garden discards.
Reason for introduction
Not controlled in New Zealand.
nummularia: Coin bearer
Factsheet prepared by Paul Champion and Deborah Hofstra (NIWA). Features description from Webb et al. (1988).
References and further reading
Webb, C.J.; Sykes, W.R.; Garnock-Jones, P.J. (1988). Flora of New Zealand Volume 4: Naturalised pteridophytes, gymnosperms, dicotyledons. Botany Division, DSIR, Christchurch.
Clapham, A.R.; Tutin, T.G.; Warburg, E.F. (1962). Flora of the British Isles. Cambridge University Press, Second Edition. 1269pp.