Classification
Class
Magnoliopsida Brongn.
Order
Saxifragales Bercht. & J.Presl
Family
Haloragaceae
Genus
Myriophyllum L.
 Nomenclature
Scientific Name:
Myriophyllum votschii Schindl., Pflanzenreich 23: 85 (1905)
Vernacular Name(s):
Small water milfoil
 Description

Dioecious perennial herb; stems usually prostrate, rarely erect, forming often patches or tight cushions to 7 cm high, branching freely, rooting at nodes, forming clumps to 10 cm diam. Lvs monomorphic, opposite, entire, obovoid or nearly so, 1.8–3.5 × (0.5)–0.7–1.1 mm, ± flat or slightly concave on upper surface, convex below, spreading or slightly upward-curving. Submerged lvs present. Fls in the axils of upper lvs; fertile lvs similar to lower lvs. Bracteoles linear, 0.5–0.7 × 0.1–0.2 mm. ♂ fls sessile, usually in axils of the uppermost pair of lvs only; sepals 0; petals 4, with reddish spot at tip, rarely completely dark red, hooded, 1.5–1.8 × 0.7–1 mm. ♀ fls sessile, in axils of upper 4–8 pairs of lvs; sepals, petals and stamens 0. Frs 0.9–1 × 1.1–1.4 mm diam., depressed-globular, smooth or weakly punctate on dorsal surface of mericarps.

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

 Biostatus
Indigenous (Endemic)
 Phenology

Flowering: Nov.–Feb.; Fruiting: Jan.–Feb.

 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.; 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]
Orchard, A.E. 1979: Myriophyllum (Haloragaceae) in Australasia. 1. New Zealand: a revision of the genus and a synopsis of the family. Brunonia 2: 247–287.
Pflanzenreich