Classification
Class
Magnoliopsida Brongn.
Order
Lamiales Bromhead
Family
Plantaginaceae Juss.
Genus
Callitriche L.
 Nomenclature
Scientific Name:
Callitriche aucklandica R.Mason, Austral. J. Bot. 7: 307 (1959)
 Description

Monoecious terrestrial herb. Stems creeping with lax, ± sprawling branches 2–10 cm long, to 20 cm when submerged. Lvs on broad membranous connate petioles; lamina thick, 3.7–8 × 1.2–4 mm, spathulate, 3-nerved, entire; base broad, membranous and connate. Fls solitary or sometimes 2 together, ebracteate. Filaments to 9 mm long, tapering from broad base. Styles 2–2.5 mm long, persistent. Fr. 1.1 × 1.2–1.3 mm, with narrow membranous wing; faces rounded; commissural groove fairly wide, deep and sharp.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]

 Biostatus
Indigenous (Endemic)
 Phenology

Flowering: Oct.

 Bibliography
de Lange, P.J.; Norton, D.A.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Hitchmough, R.; Townsend, A.J. 2009: Threatened and uncommon plants of New Zealand (2008 revision). New Zealand Journal of Botany 47: 61–96. [Naturally uncommon]
de Lange, P.J.; Norton, D.A.; Heenan, P.B.; Courtney, S.P.; Molloy, B.P.J.; Ogle, C.C.; Rance, B.D. 2004: Threatened and uncommon plants of New Zealand. New Zealand Journal of Botany 42(1): 45–76.
de Lange, P.J.; Rolfe, J.R.; Barkla J.W.; Courtney, S.P.; Champion, P.D.; Perrie, L.R.; Beadel, S.N.; Ford, K.A.; Breitwieser, I.; Schönberger, I.; Hindmarsh-Walls, R.; Heenan, P.B.; Ladley, K. 2018: Conservation status of New Zealand indigenous vascular plants, 2017. New Zealand Threat Classification Series. No. 22. [Naturally Uncommon]
de Lange, P.J.; Rolfe, J.R.; Champion, P.D.; Courtney, S.P.; Heenan, P.B.; Barkla, J.W.; Cameron, E.K.; Norton, D.A.; Hitchmough, R.A. 2013: Conservation status of New Zealand indigenous vascular plants, 2012. New Zealand Threat Classification Series 3. Department of Conservation, Wellington. [Naturally Uncommon]
Lansdown, R.V. 2022: The genus Callitriche (Plantaginaceae, Callitricheae) in Australasia and Oceania. Phytotaxa 547(3): 243–284.
Mason, R. 1959: Callitriche in New Zealand and Australia. Australian Journal of Botany 7: 295–327.