Myriophyllum aquaticum (Vell.) Verdc

Parrot's Feather

Kew Bull. 28: 36 (1973) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Perennial aquatic or semi-aquatic herb, dioecious, glabrous; stems to 2 m long, 4–5 mm diam., glaucous, rooting at lower nodes. Leaves in whorls of 4–6, pectinate; submerged leaves oblanceolate, to 4 cm long; emergent leaves narrow-oblanceolate, to 3.5 cm long, 5–8 mm wide, glaucous, pinnae 18–36. Bracteoles subulate to trifid, 1.2–1.5 mm long, white. Male flowers absent in Australia. Female flowers shortly pedicellate, solitary; sepals 4, triangular, 0.4–0.5 mm long, white; petals absent; ovary 4-celled; styles clavate, 0.1–0.2 mm long; stigmas white. Fruit not formed in Australia. Flowers spring–summer.

*CVU, *EGL, *GipP, *Gold, *HSF, *VRiv, *VVP, *WaP. Also naturalised WA, SA, Qld, NSW, Tas. Native to South America. Of scattered occurrence in waterways and dams mostly in east of State.

A troublesome weed in south-eastern Queensland and northern New South Wales where it blocks creeks, drains and channels. Male plants are unknown outside South America, and even there fruits are rare. It spreads mainly by vegetative means with broken stem fragments rooting adventitiously.

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 aquaticum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Myriophyllum aquaticum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Gippsland Plain present naturalised
Warrnambool Plain present naturalised
Goldfields present naturalised
Central Victorian Uplands present naturalised
East Gippsland Lowlands present naturalised
Highlands-Southern Fall present naturalised

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales