Vascular – Exotic
Dicotyledonous Herbs other than 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.
Minute herb with wedge-shaped leaves up to 7 mm long growing from underground parts, flower stalks much larger, usually around 10 cm long, with 2 to 8 oblong violet or white flowers up to 1.5 cm long.
Only known from two sites in Waitakere District, Auckland.
Dune slack wetlands amongst oioi (Apodasmia similis).
Annual or perennial, terrestrial. Rhizoids few to many, capillary, simple. Stolons up to 5.0 cm long, few, apillary, much branched. Leaves few, usually one at peduncle base, others scattered on stolons; lamina 0.2-7.0 × 1.0-6.0 mm, narrowly cuneate or obovate to reniform, petiolate. Traps numerous on rhizoids, stolons, and leaves, 1-2 mm long, ovoid, stalked. Inflorescences 2-80 cm long, erect, solitary, simple or branched above; peduncle 0.5-2.0 mm diam., terete, glabrous. Bracts c. 1 mm long, basifixed, ovate to ovate-deltoid. Flowers 2-8, distant to congested; pedicels 1-3 mm long, terete, erect in flower, spreading or reflexed in fruit; calyx 2-5 mm long; corolla 5-15 mm long, violet, lower floral limb transversely wrinkled; filaments c. 1 mm long; ovary globose; style cylindrical, short. Capsule c. 2 mm long, globose, dehiscing by longitudinal slits. Apparently seed is not produced in naturalised populations.
Other so-called ‘terrestrial’ Utricularia species have similar leaves, although the native U. dichotoma and U. delicatula do not have wedge-shaped leaves. Two other introduced species U. sandersonii and U. arenaria have a spur that extends well beyond the lower lip of the flower.
Deliberate planting and water borne dispersal of rhizome fragments
Tropical and southern Africa, Madagascar and Mexico.
Reason for introduction
utricularia: A small bladder
Factsheet prepared by Paul Champion and Deborah Hofstra (NIWA).
References and further reading
Heenan, P.B.; de Lange, P.J.; Cameron, E.K.; Ogle, C.C.; Champion, P.D. (2004). Checklist of dicotyledons, gymnosperms and pteridophytes naturalised or casual in New Zealand: additional records 2001-2003. New Zealand Journal of Botany 42: 797-814.