Myriophyllum gracile var. lineare Orchard

Slender Water-milfoil

Brunonia 8: 234 (1985) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: endangered (e); listed in Flora and Fauna Guarantee Act 1988

Perennial aquatic or semi-aquatic herb, sometimes dioecious; stems slender, erect, 5–20 cm tall, mostly c. 1 mm diam., rooting mainly at the base. Leaves alternate, 5–8 mm long; lower leaves linear to narrow-lanceolate, often shortly toothed; upper leaves entire. Bracteoles linear to ovate, 0.3–0.6 mm long; flowers solitary, male and female flowers on same spike, or often, female flowers alone. Male flowers sessile; sepals 4, linear-lanceolate, 0.4–0.5 mm long, erose; petals 4, 2–2.5 mm long, creamy-yellow with red tip; stamens 8. Female flowers sessile or subsessile; sepals and petals absent; ovary 4-celled, styles elongating and reflexing, stigmas white. Fruit cubiform, yellow-brown to deep reddish-brown; mericarps cylindric, 0.5–0.7 mm long, smooth or papillose in lower half, often with an apical rim.  Flowers mainly in spring.

MuF, NIS, VRiv. Also Qld, NSW. In Victoria, known only from a few collections near Numurkah where it grows in damp areas that become pools in winter.

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
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Distribution map


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Myriophyllum gracile var. lineare in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Myriophyllum gracile var. lineare in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Riverina present native
Murray Fans present native
Northern Inland Slopes present native

State distribution

Distribution map
New South Wales