Classification
Class
Magnoliopsida Brongn.
Order
Alismatales R.Br. ex Bercht. & J.Presl
Family
Potamogetonaceae Bercht. & J.Presl
Genus
Potamogeton L.
 Nomenclature
Scientific Name:
Potamogeton suboblongus Hagstr. (1916)
Vernacular Name(s):
Mānihi; Mud pondweed; Rērēwai
 Description

Leaves mostly floating, long- or short-petiolate, mostly broad-elliptic and subacute, longitudinal nerves (11)–13–21. Spike 1–2 cm long, dense. Achenes swollen, not obviously keeled, often reddish.

[From: Healy and Edgar (1980) Flora of New Zealand. Volume 3.]

 Biostatus
Indigenous (Endemic)
 Phenology

Flowering: Dec.–Feb.; Fruiting: Jan.–Mar.

 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. [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. [Not Threatened]
Mason, R. 1949: Notes on Some Water Plants. Wellington Botanical Society Bulletin 21: 10–13.