Classification
Class
Magnoliopsida Brongn.
Order
Lamiales Bromhead
Family
Plantaginaceae Juss.
Genus
Callitriche L.
 Nomenclature
Scientific Name:
Callitriche petriei R.Mason, Austral. J. Bot. 7: 315 (1959)
Vernacular Name(s):
Starwort
 Description

Monoecious or dioecious herb of wet ground with creeping unbranched stems ascending 3–7 cm, less often aquatic with submerged stems to 20 cm or more long, without definite rosettes. Terrestrial lvs (1)–2.2–(8) mm long, thin, spathulate or obovoid to suborbicular, entire, 3–5-nerved; submerged lvs slightly longer and linear or linear-spathulate, 1-nerved. Fls usually solitary in 1 lf axil of each pair, ebracteolate. Filaments 2–4 mm long; Style 1.7–2.2 mm long, ± persistent. Fr. 0.6–0.9 × 0.7–1.1 mm, suborbicular and broader than long; wing 0; faces strongly convex; commissural groove shallow and narrow.

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

 Biostatus
Indigenous (Endemic)
 Phenology

Flowering: Dec.–Feb.

 Bibliography
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. [as Callitriche petriei R.Mason subsp. petriei] [Not Threatened]
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. [as Callitriche petriei R.Mason subsp. petriei] [Not Threatened]
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.