Myriophyllum striatum Orchard

Striped Water-milfoil

Brunonia 8: 243 (1986) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: vulnerable (v); listed in Flora and Fauna Guarantee Act 1988

Perennial terrestrial or aquatic herb, sometimes dioecious; terrestrial plants mat-forming 10–15 cm tall, stems to 1 mm diam., rooting at the nodes; aquatic plants with stems to 30 cm long. Leaves in terrestrial plants alternate, linear, 5–8 mm long, margins entire. Leaves in aquatic plants dimorphic; submerged leaves in pseudo-whorls or scattered, ovate, mostly 10–18 mm long, pectinate, with up to 20 pinnae; emergent leaves alternate, whorled above, terete, mostly 10–18 mm long, margins entire. Bracteoles of male flowers triangular to oblong, 0.6–0.9 mm long; bracteoles of female flowers linear-lanceolate, c. 0.4 mm long; flowers solitary. Male flowers initially sessile, later on pedicel 0.4–5 mm long; sepals absent or vestigial; petals 4, 2.5–2.8 mm long, cream to reddish; stamens 8. Female flowers sessile; sepals and petals absent; ovary 4-celled, styles reflexed, stigmas white. Fruit cubiform, purplish-black; mericarps cylindric, 0.7–1 mm long, truncate, with 2–4 longitudinal ribs formed by fused papillae. Flowers spring–summer.

Gold, MuF, NIS, VRiv. Also Qld, NSW. Rare species currently known only from the Wedderburn, Terrick Terrick, and Nathalia areas of northern Victoria. Grows mainly fully emergent in damp situations on creekbanks and around waterholes, but occasionally found in deep water.

A variable species with 2 distinct growth forms. The type form is fully emergent and lacks pectinate foliage. However, the leaves of plants growing in deep water are dimorphic, and these plants resemble larger specimens of Myriophyllum simulans but, unlike that species, the male flowers lack sepals.

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 striatum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Myriophyllum striatum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Riverina present native
Murray Fans present native
Goldfields present native
Northern Inland Slopes present native

State distribution

Distribution map
New South Wales