New Zealand Plant Conservation Network
  • Member login
  • Join
Facebook
  • Home
  • Flora
    • Flora species
    • Vascular
    • Non Vascular
    • Plant identification
    • Fungi
    • Make your own book
    • Quiz
  • Threats
    • Exotic Plants (Weeds)
    • Pest Animals
    • Other threats
  • Ecosystems
    • Plant communities
    • Ecosystem services
    • Novel ecosystems
  • Publications
    • Plant lists
    • Botanical Society journals
    • Newsletter
    • NZPCN publications
    • Documents
  • Conservation
    • Seedbank
    • Training
    • Restoration
    • Monitoring
    • Habitat protection
    • Funding
    • Botanic gardens
  • NZPCN
    • Members
    • Council members
    • Awards
    • David Given Scholarship
    • Events
    • Shop
    • Favourite Plant
    • Join
    • News
    • Donate
    • Trilepidea newsletter
    • Why join NZPCN?
  • Contact us
  • Help
    • FAQ
    • Query
    • Glossary

Search flora

You are here:
  1. Home
  2. Flora
  3. Flora species
  4. Helosciadium nodiflorum

Helosciadium nodiflorum

Mangatangi. Nov.<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
Mangatangi. Nov.<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
Heretaunga, Upper Hutt.<br>Photographer: Jeremy R. Rolfe, Date taken: 17/06/2006, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Heretaunga, Upper Hutt.<br>Photographer: Jeremy R. Rolfe, Date taken: 17/06/2006, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Heretaunga, Upper Hutt.<br>Photographer: Jeremy R. Rolfe, Date taken: 17/06/2006, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Silverstream, Upper Hutt.<br>Photographer: Jeremy R. Rolfe, Date taken: 29/12/2006, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Wainuioimata River mouth.<br>Photographer: Jeremy R. Rolfe, Date taken: 26/12/2006, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Whanganui. Dec 2011.<br>Photographer: Colin C. Ogle, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Flowering Apium nodiflorum.<br>Photographer: Paul Champion, Date taken: 17/02/2004, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Foliage of Apium nodiflorum.<br>Photographer: Rohan Wells, Date taken: 25/10/2003, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Foliage of Apium nodiflorum.<br>Photographer: Trevor James, Date taken: 05/01/2005, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Download PDF Comment on factsheet

NZPCN members can select up to 20 plant species and automatically create a full colour, fully illustrated A4 book describing them (in PDF format).

  • Find out more...
  • Join NZPCN...
Find in plant lists
iNaturalist NZ View observations Donate Support NZPCN

Common name

water celery, fool’s watercress

Synonyms

Apium nodiflorum (L.) Lagasca

Family

Apiaceae

Authority

Helosciadium nodiflorum (L.) W.D.J.Koch

Flora category

Vascular – Exotic

Structural class

Herbs - Dicotyledons other than Composites

NVS code

The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.

APINOD

Conservation status

Not applicable

Brief description

Sprawling emergent perennial aquatic plant that can grow over a metre in height, with bright green leaves arranged in pairs up each stem, and white flowers close to leaf bases.

Distribution

Scattered distribution from Northland to Wellington, abundant in many areas. Has also established in the north and west of the South Island.

Habitat

Shallow water ponds, drains, and the margins of slow moving streams.

Wetland plant indicator status rating

Information derived from the revised national wetland plant list prepared to assist councils in delineating and monitoring wetlands (Clarkson et al., 2021 Manaaki Whenua – Landcare Research Contract Report LC3975 for Hawke’s Bay Regional Council). The national plant list categorises plants by the extent to which they are found in wetlands and not ‘drylands’. The indicator status ratings are OBL (obligate wetland), FACW (facultative wetland), FAC (facultative), FACU (facultative upland), and UPL (obligate upland).

OBL: Obligate Wetland

Almost always is a hydrophyte, rarely in uplands (non-wetlands).

Features

Stout perennial herb with prostrate and ascending stems. The stems are hollow, finely furrowed, may be up to 2m long and root at the lower nodes. The leaves are glossy, bright green to 70 cm long with 2 to 8 pairs of toothed stalkless oval to lance-shaped leaflets. The individual flowers are small (2 to 2 mm) with five white petals, and occur in short stalked clusters/umbels (2 to 4 cm) in diameter. The fruit are dark brown, small (2mm long) and ovoid/egg shaped and ribbed.

Similar taxa

Wild celery (Apium graveolens), New Zealand celery (Apium prostratum) and Watercress (Nasturtium spp.). Wild celery is similar but does not root at the nodes, and NZ celery has thicker three lobed and shortly pinnate leaves.

Flowering

November to February

Flower colours

White

Fruiting

Late summer to autumn

Life cycle

Seed germinate on damp substrates. Regrows from detached shoots, which readily form roots, and from seed.

It can be mistaken for watercress and be collected and distributed as such.

Year naturalised

1947

Origin

Native to Britain, central Europe, Asia and North Africa.

Reason for introduction

Possibly seed contaminant or contaminant of ornamental pond plants.

Control techniques

Can be controlled manually, mechanically or herbicidally depending on situation (Newman, 2004).

Tolerances

Seed germinate on damp substrates.

Attribution

Factsheet prepared by Paul Champion and Deborah Hofstra (NIWA).

References and further reading

Johnson PN, Brooke PA (1989). Wetland plants in New Zealand. DSIR Field Guide, DSIR Publishing, Wellington. 319pp.

Newman J (2004), Information sheet 28: Fools watercesss. Centre for Ecology and Hydrology , UK.

Popay et al (2010). An illustrated guide to common weeds of New Zealand, third edition. NZ Plant Protection Society Inc, 416pp.

Johnson, A. T., Smith, H. A. (1972). Plant Names Simplified: Their pronunciation, derivation and meaning. Landsman Bookshop Ltd: Buckenhill, UK.

▲ Back to top
  • Home
  • Flora
  • Threats
  • Ecosystems
  • Publications
  • Conservation
  • NZPCN
  • Contact us
  • Help

© 2023 New Zealand Plant Conservation Network • Website by RS

Coastlands Plant Nursery Wildlands

Website sponsor

  • Home
  • Flora
    • Flora species
    • Vascular
      • Ferns
        • King fern
        • True ferns
        • Adder's tongue ferns
        • Fork ferns and whisk ferns
        • Horsetails
      • Conifers
        • Celery pines
        • Kauri
        • Podocarps
          • Podocarpus
          • Dacrydium
          • Prumnopitys
          • Dacrycarpus
          • Halocarpus
          • Lepidothamnus
          • Manoao
        • Cypress
      • Flowering plants
        • Parasites
          • Leafy mistletoes
          • Pygmy mistletoes
            • Korthalsella hosts
            • Dispersal of Korthalsella
            • Korthalsella flowers
            • Associates of Korthalsella
          • Root parasites
          • Saprophytes
        • Epiphytes
          • NZ
            • Typical
            • Occasional
            • Hemi-epiphytes
            • Ephemeral
            • NZ list
        • Monocots
          • Orchids
            • Structure
          • Grasses
        • Dicots
          • Hebes
          • Kowhai
          • Coprosma
          • Beech
          • Rata
        • Carnivorous
        • Deciduous plants
        • Aquatic plants
      • Poisonous natives
      • Threatened plant lists
      • What's a vascular plant?
      • Club mosses
    • Non Vascular
      • Bryophytes
        • Liverworts
        • Mosses
        • Hornworts
      • Algae
        • Seaweeds
      • Lichens
    • Plant identification
      • Written descriptions
      • Experts
      • Plant keys
        • Key to parasitic plant genera
      • Collecting plants
        • Should I collect
        • Choosing a specimen
        • Field notes
        • Fresh plant material
        • Pressing and drying
        • Mounting specimens
        • Labelling specimens
    • Fungi
    • Make your own book
    • Quiz
  • Threats
    • Exotic Plants (Weeds)
      • Unwanted organisms
      • DOC weeds
      • Plant me instead
      • Pest Plant Accord
    • Pest Animals
      • Mammals
        • Mustelids
        • Rodents
        • Ungulates
        • Possums
      • Fish
      • Insects
    • Other threats
      • Natural events
        • Insects
      • Human induced
        • Habitat loss
        • Collection
        • Climate change
  • Ecosystems
    • Plant communities
      • Dunes
        • Volcanic
        • Coastal
          • Pingao research
          • What you can do
          • Common species
          • Research on dunes
          • Threats
      • Wetlands
        • Estuaries
          • Common estuarine species
          • Research on estuaries
        • Ephemeral
        • Restiad peat bogs
      • Forests
        • Kauri-podocarp-broadleaved
        • Podocarp broadleaved
        • Beech
      • Scrub/shrublands
        • Geothermal
          • Distribution of geothermal vegetation
          • Geothermal plants
          • Geothermal vegetation types
          • Threats to geothermal vegetation
        • Frost flat/hollow
        • Manuka fens
        • Gumlands
      • Grasslands
        • Tussock grasslands
      • Bare ground
        • Braided rivers
        • Alpine
        • Cliff
        • Scree and boulderfields
        • Shingle beaches
      • Herbfields
        • Saltpan
    • Ecosystem services
    • Novel ecosystems
  • Publications
    • Plant lists
      • How to prepare a plant list
      • National plant lists
      • Plant lists by region
      • Search plant lists
    • Botanical Society journals
    • Newsletter
    • NZPCN publications
    • Documents
  • Conservation
    • Seedbank
      • Project 2 - Alpine flora and the Forget-Me-Nots
      • Project 3 - Kowhai and its relatives
      • Project 1 - Pohutukawa, Rata and Myrtaceae
      • Project 4 - Podocarps and trees of the forest
    • Training
      • Module 1: Plant life
      • Module 2: Covenants
      • Module 3: Propagation
      • Module 4: Wetlands
      • Pilot course 2006
    • Restoration
      • Gardening
        • Being weed wise
        • Garden plants
          • Ferns
          • Climbers
          • Trees and shrubs
          • Broad-leaved herbs
          • Grass-like herbs
        • Attracting wildlife
        • Planting for lizards
          • Rules
      • Species recovery
        • Plant translocations
      • Ecological restoration
        • Case studies
          • Tavora Reserve
          • Waiwhakareke
      • Revegetation
      • Eco-sourcing
      • Find a restoration group
    • Monitoring
      • Number count
        • Number count method
        • Pros and cons of number counts
        • Data analysis and interpretation
      • Presence/absence surveys
        • Presence/absence survey methods
        • Pros and cons of presence/absence surveys
        • Data analysis and interpretation
      • Mapping spatial extent
        • Pros and cons of spatial extent mapping
        • Data analysis and interpretation
        • Spatial extent mapping methods
      • Photo points
        • Photo point guidelines
    • Habitat protection
      • Legal protection
        • Nga Whenua Rahui
        • QEII covenants
        • DOC Covenants
      • Animal pest control
      • Weed control
      • Fencing
    • Funding
    • Botanic gardens
  • NZPCN
    • Members
    • Council members
      • Council 2009
      • Council 2010
      • Council 2011
      • Council 2012
      • Council 2013
      • NZPCN council member profiles
      • Council 2003
      • Council 2004
      • Council 2005
      • Council 2006
      • Council 2007
      • Council 2008
      • Council 2014
      • Council 2015
      • Council 2016
      • Council 2017
      • Council 2018
      • Council 2019
      • Council 2020
      • Council 2021
      • Council 2022
      • Council 2023
    • Awards
      • NZPCN Awards
        • 2018
        • 2016
        • 2015
        • 2014
        • 2013
        • 2012
        • 2011
        • 2010
        • 2009
        • 2008
        • 2007
        • 2006
        • 2005
        • 2017
        • 2019
        • 2022
    • David Given Scholarship
      • David Given Scholarship Recipients
    • Events
      • Conference 2019
      • Conference 2017
      • Conference 2015
        • Speakers
        • Workshops
        • Field trips
        • Charity auction
      • Conference 2013
        • Speakers
        • Timetable
      • Conference 2022
        • 2022 conference field trips
        • 2022 conference workshops
        • Code of conduct
        • 2022 conference sponsors
        • COVID-19 information
        • Abstract and poster submission
        • 2022 Conference venue and accommodation
        • 2022 conference postponement
        • Conference Workshop: Restoration Pathways
        • Conference programme summary
      • 2023 Restoration Pathways Workshop
    • Shop
    • Favourite Plant
    • Join
    • News
    • Donate
    • Trilepidea newsletter
    • Why join NZPCN?
  • Contact us
  • Help
    • FAQ
      • The Network
      • Network website
      • New Zealand plants
      • The law
      • Your discoveries
      • Joining the Network
    • Query
    • Glossary