Myriophyllum muelleri Sond.

Hooded Water-milfoil

Linnaea 28: 233 (1856) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Slender perennial aquatic herb; stems to 60 cm long, c. 1 mm diam., rooting mainly at the base, emergent parts branched. Leaves mostly decussate, lowermost rarely in whorls of 3, uppermost sometimes alternate, orbicular, mostly 5–11 mm long, pectinate, with 12–16 pinnae. Bracteoles of male flowers ovate to orbicular, c. 1.3 mm long, apiculate, white; bracteoles of female flowers similar, c. 0.4 mm long; flowers solitary. Male flowers terminal, usually single, on a slender peduncle to 20 mm long and on a receptacle 0.4–1 mm long, enclosed in a hooded bract; sepals 4, vestigial; petals 4, 2.1–2.2 mm long, red, deciduous; stamens 8. Female flowers sessile, naked, 2–4 per branch of inflorescence, situated below male flower; sepals and petals absent; ovary 4-celled, styles teardrop-shaped, creamy-yellow, stigmas smooth. Fruit cylindric, silvery-grey to reddish; mericarps cylindric, 1.7–1.8 mm long, truncate, smooth. Flowers Sep.–Feb.

Brid, DunT, GipP, Glep, HNF, OtP, VVP, WaP, Wim. Also WA, SA, Tas. Scattered across southern Victoria west from French Is., where found growing in lakes and swamps in both fresh and brackish water.

A distinctive species readily recognized by its decussate pectinate leaves, large fruit and pedicellate male flowers subtended by a hooded bract. The hooded bracts are unique in the genus (Orchard 1985).

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

Orchard, A.E. (1985). Myriophyllum (Haloragaceae) in Australasia. II. The Australian Species, Brunonia 8: 173-291.

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 muelleri in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Myriophyllum muelleri in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Glenelg Plain present native
Bridgewater present native
Victorian Volcanic Plain present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Dundas Tablelands present native
Highlands-Northern Fall present native

State distribution

Distribution map
Western Australia
South Australia