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Book cover - Common Weeds of New ZealandAn Illustrated Guide to
Common Weeds
of New Zealand

 

Myriophyllum aquaticum
parrot's feather

Family HALORAGACEAE

Reproduced from
Common Weeds of New Zealand
by Ian Popay, Paul Champion & Trevor James
ISBN 0 473 09760 5
by kind permission of the
New Zealand Plant Protection Society

Publication or other use of images or descriptive text on these pages is unauthorised unless written permission is obtained from the authors and publisher.
Appropriate acknowledgement of the publication Common Weeds of New Zealand must always be given.

Available from Touchwood Books

Myriophyllum aquaticum - parrot's feather

Bottom-rooted, aquatic perennial, with stems emerging above the water surface. Leaves feather-like, finely divided. Forms dense mats floating on the surface, or on damp ground. Occurs in shallow, still or slow-moving freshwater less than 2.5 m deep.

  • Flowers Minute, without petals. Broadly-triangular white sepals 0.5 x 0.3 mm enclose the four-ribbed ovary. Female flowers solitary in the axils of aerial leaves. Male flowers (on different plants from the female flowers) not seen in NZ. Flowers Sep-Feb.
  • Fruit Not set in NZ.
  • Leaves Pale bluish-green, up to 45 mm long by 15 mm wide, in whorls of five or six. Finely-divided into 25-30 awl-shaped leaflets, each up to 7 mm long.
  • Stems Bluish-green, up to 5 mm in diameter. Up to 2 m long, emerging up to 10 cm above the surface. Submerged parts bare, with constricted nodes.
  • Roots Appearing at the lower stem nodes.

Habitat

Shallow freshwater of peaty or organically rich swamps and drains, lake margins and slow-moving water.

Distribution

Locally common in scattered NI localities in Auckland, Waikato, Wairarapa and southern Manawatu. Originally from South America.

Comments

Listed on the National Pest Plant Accord (see Introduction for details).

Derivation of botanical name

Myriophyllum (Gr.) = many leaves, referring to the finely divided leaves; aquaticum (Lat.) = growing in water.

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Last updated: July 13, 2014