Myriophyllum caput-medusae

Coarse Water-milfoil

Perennial herb rooting at the base, emergent section many branched. Submerged and emergent leaves different.

Additional information

  • FamilyHaloragaceae
  • StoreyLower storey
  • Sizestems 0.3-2 m long
  • Plant groupingAquatic & Semi aquatic
  • LeavesSubmerged - egg-shaped, 12-20 mm long in rings of 3-8, leaves divided to midrib with narrow segments like teeth on a comb; Emergent - rings of 3-5 entire egg-shaped bluish-green leaves 6.5-8 mm long, often purplish tipped, becoming alternate,
  • Flower colourMale - yellow to reddish; female - green with red stigmas
  • Flowering timeOctober to April
  • FlowersSingle stalkless male and female flowers in upper leaf axils. Spikes of male flowers above female flowers. Olive brown fruit, cylindric with spines when mature.
  • Bird attractingNo
  • Butterfly attractingNo
  • Frog habitatYes
  • Growing conditionsAquatic to a depth of 2 m in billabongs. Full sun, semi-shade.
  • Garden usePlant in dams and large ponds.
  • Commercially availableWholesale only - order in advance
  • Conservation statusSignificant within the Shire. Known from very few local sites. More common outside the Shire boundary.
Photographer/s: 1 Euan Moore, Atlas of Living Australia website at http://www.ala.org.au. ©; 2 G. Thomlinson, Royal Botanic Gardens Board ©

Plant Communities

  • 47 Open Water - Reservoirs, lakes, etc (EVC 718)
  • 35 Floodplain Wetland Complex (EVC 172)
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