Illustrated Guide to
of New Zealand
Weeds of New Zealand
by Ian Popay, Paul Champion & Trevor James
ISBN 0 473 09760 5
by kind permission of the
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.
of the publication Common Weeds of New Zealand must always
Available from Touchwood
submerged, vigorous freshwater perennial up to 4 m tall, growing
from depths of up to 6 m. One of the oxygen weeds.
- Flowers Pink,
minute, 0.25 mm in diameter and up to 6 cm long, threadlike, singly
in axils of upper leaves, female only in NZ. Flowers Jan.
- Fruit Does
not seed in NZ, reproduces vegetatively by stem fragments.
- Leaves Alternate
along the stem, but closely-spaced, overlapping and curled backwards.
Dark green, up to 16 mm long by 2 mm wide. Crowded towards the
tips of the stems, more spaced below.
- Stems Fragile,
slender, 3 mm thick, much-branched.
- Roots Fibrous.
Clear, still or slow-moving,
low fertility freshwater of ponds, lakes, streams and rivers.
NI, more local in SI. Originally from South Africa.
The oxygen weeds include
Egeria, Elodea and Lagarosiphon. In
Lagarosiphon, the leaves are spirally arranged, not in
whorls, and are 16 mm long, stiff and strongly recurved. The flowers
are small, pink and float on the water surface. Lagarosiphon
is similar to Elodea, but is stiffer and larger, with
longer stems. Listed on the National
Pest Plant Accord (see Introduction for details).
of botanical name
= thin tube, the narrow perianth tube; major (Lat.) =