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Browse the 1966 Encyclopaedia of New Zealand
Graphic: An Encyclopaedia of New Zealand 1966.


This information was published in 1966 in An Encyclopaedia of New Zealand, edited by A. H. McLintock. It has not been corrected and will not be updated.

Up-to-date information can be found elsewhere in Te Ara.



Introduced Plants

In addition, there are some introduced plants which have become very abundant, in some cases blocking streams and rivers. Among these is watercress, Nasturtium officinale, one of the plants introduced by early colonists as a food, which became a nuisance in the Avon River and streams about Christchurch. Pond weeds, which have become very abundant and in certain instances a serious problem of control, are Ottelia ovalifolia, from Australia, and Aponogeton distachyon, a water hyacinth from South Africa. A greater threat comes from another water hyacinth, Eichhornia crassipes, the growing of which is strictly prohibited in New Zealand. It has attractive pink-mauve flowers with yellow and purple markings on one petal. It grows very rapidly, has extensive rhizomes, and may root in mud or float on water.

by Olive Rita Croker, M.A., Botanist, Wellington.