Myriophyllum lophatum Orchard

Crested Water-milfoil

Brunonia 8: 277 (1986) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: data deficient (k)

Perennial semi-aquatic or emergent herb; stems prostrate, rooting at the nodes, tips erect, 2–3 cm tall, c. 1 mm diam. Leaves opposite, linear, with a terminal gland, 2.5–7 mm long, margins entire. Bracteoles of male flowers oblong to oblanceolate, 1.2–1.8 mm long; bracteoles of female flowers similar 0.5–0.7 mm long; flowers solitary, male and female flowers on same or different shoot. Male flowers initially sessile with the pedicel elongating to 10 mm; sepals absent or 1–4, vestigial, filiform, caducous; petals 4, 1.7–2 mm long, red; stamens 8. Female flowers sessile; sepals and petals absent; ovary 4-celled, styles sessile, stigmas white. Fruit cubiform to cylindric, red to yellowish-brown; mericarps ovoid to cylindric, 0.6–0.8 mm long, truncate, with an irregular dorsal crest and 2 smaller lateral crests. Flowers summer.

GipP, HNF, SnM. Also NSW, ACT. In Victoria apart from an isolated near-coastal occurrence in the Yarram area, apparently confined to the north-eastern border area. Grows along boggy stream margins, around waterholes and in wet depressions.

In the absence of flowers and fruit, this species is almost indistinguishable from Myriophyllum pedunculatum. Myriophyllum lophatum generally has a shorter stature, the flowers lack persistent sepals and the fruit is truncate and crested.

Source: Jeanes, J.A. (1996). Haloragaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2017-08-16
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder [Saxifraganae]
order Saxifragales
family Haloragaceae
genus Myriophyllum
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Myriophyllum lophatum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Myriophyllum lophatum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Gippsland Plain present native
Highlands-Northern Fall present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
New South Wales
Australian Capital Territory