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 An
Illustrated Guide to
Common Weeds
of New Zealand
Lagarosiphon
major
lagarosiphon
Family
HYDROCHARITACEAE
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 Nationwide Book Distributors
Wholly
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.
Habitat
Clear, still or slow-moving,
low fertility freshwater of ponds, lakes, streams and rivers.
Distribution
Scattered throughout
NI, more local in SI. Originally from South Africa.
Comments
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).
Derivation
of botanical name
Lagarosiphon (Gr.)
= thin tube, the narrow perianth tube; major (Lat.) =
larger.
Web-notes:
Weed Links
On this site
Reproduced from Common Weeds
of New Zealand:
External Links
 Weedbusters
New Zealand
- Weedbusters is a weeds awareness and education programme that aims to
protect New Zealand's environment from the increasing weed problem.
- AgPest
- A free tool to assist farmers and agricultural professionals in decision-making regarding weed and pest identification, biology, impact and management.
 New Zealand Weeds Key
- An interactive identification key to the weeds of New Zealand. Developed at Landcare Research.
New
Zealand Plant Conservation Network naturalised plants
- Search for information on more than 2500 naturalised and weedy plants.
 New
Zealand Plant Protection Society
- Their main objective: "To pool and exchange information on the biology
of weeds, invertebrate and vertebrate pests, pathogens and beneficial organisms
and methods for modifying their effects."
-
 Massey
University Weeds Database- A site providing information about New Zealand weeds and weed control.
It has a series of pages showing pictures of New Zealand weeds, notes on
identification and control. It also provides information on a university
paper entitled Controlling Weeds.
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