Images | Earth Sciences New Zealand | NIWA

On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

NIWA

Manchurian wild rice herbicide trial.
R. Wells

Hornwort specimen (Photo: R. Wells)
NIWA

Current distribution of hornwort in New Zealand waterways, showing the potentially eradicated South Island site.
J. Clayton

Lake weed caught on a boat trailer - this is a typical way for weeds like hornwort to spread to new sites (Photo: J. Clayton).
NIWA

Hornwort can form very dense, tall weed beds in the littoral zone of lakes.
from Coffey and Clayton, 1988

Plants in Lake Wanaka
from Coffey and Clayton, 1988

Specimen of R. limosella
from Coffey and Clayton, 1988

G. diandrum in the upper Waikato River
Spongia manipulatus (Cook & Bergquist, 2002).
NIWA

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NIWA

Grab samples of road runoff
R. Wells

O. ovalifolia