Water poppy

Hydrocleys nymphoides

Identification image pending

What

Water poppy is recorded by a competent New Zealand authority as an introduced, invasive or managed threat subject. Source context (Waikato Regional Council): Perennial water-lily-like plant with thick, shiny, oval bright-green floating leaves; the main vein is inflated underneath. Leaves and roots cluster at nodes on stems floating just beneath the surface. Distinctive three-petalled yellow, poppy-like flowers with purple centres occur from November to April.

Why

The source identifies ecological, biosecurity or habitat risks that make this subject relevant to NZ Ex Games intelligence. Source context (Waikato Regional Council): Dense growth can choke streams, shallow ponds and lake margins, contributing to flooding. It shades other plants, reduces nutrient availability, alters habitat for other organisms, obstructs recreational access and can affect the mauri of freshwater bodies.

Where

Distribution and current presence are place-specific and must be established from current authoritative or verified evidence.

Established knowledge

For consequential field decisions, consider the knowledge state and cited sources for each claim, and consult authoritative guidance where appropriate. Information and reliance terms

50% reference coverage — not scientific certainty or ecological progress

Identification
NZ status
Ecological impact
Sources

Open knowledge

These are parts of the public picture that could become clearer with better evidence.

Distribution
Visual clues
Confusion species
Regional intelligence

Sources & credits

NIWA — Freshwater invasive species of New Zealand 2020authoritative · Canonical identity, New Zealand status and threat context
Waikato Regional Council — Water poppy (what, ecological-impact)authoritative · Supports the attributed what, ecological-impact context. Source scope and dates apply; this does not establish current local presence, current legal status or media reuse permission.

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Field observations

Field observations connect sightings and signs with a place, time and source. They can support evidence after review. This dossier does not accept public submissions.

No field observations are published for this Target.

Commentary

Local experience, corrections and context help explain the public record. Commentary is not verified knowledge. This dossier does not accept public comments.

No commentary is published for this Target.

Questions and Missions

What can the sources tell us, and what still needs evidence? Explore dossier discoveries and research questions to understand this Target. Research leads identify knowledge gaps; they are not field assignments.

Explore Missions and Hunt mode for Water poppy

Where is water poppy currently established or emerging in New Zealand?Research question · evidence needed
What evidence distinguishes current ecological impact from presence alone for water poppy?Research question · evidence needed
What authoritative evidence establishes the introduction history of water poppy in New Zealand?Research question · evidence needed

Shout Out

Share this record so others can explore the same question, place or ecological work. The link keeps its context and sources together.

Water poppy — The Hit List — NZ Ex Games

Canonical link

/hit-list/weed-water-poppy

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