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What
Lagarosiphon is recorded by a competent New Zealand authority as an introduced, invasive or managed threat subject.
The Hit List
Verified public Target identity
freshwater · flora / algae
Lagarosiphon
Lagarosiphon major
Also known as Oxygen weed
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Visual markers
- Submerged stems carry narrow leaves arranged alternately in a spiral, with the leaf tips characteristically curved downward.
- Check leaf arrangement before using overall growth form: lagarosiphon leaves are alternate rather than whorled.
Why
The source identifies ecological, biosecurity or habitat risks that make this subject relevant to NZ Ex Games intelligence.
Where
Distribution and current presence are place-specific and must be established from current authoritative or verified evidence.
Identification notes
- Egeria: Egeria has leaves in obvious whorls around the stem rather than alternate spiral leaves. Compare dossier.
- Hornwort: Hornwort has repeatedly forked, bristly leaves in whorls and lacks true roots. Compare dossier.
Keep in mind: Aquatic plants can be difficult to identify from distant surface photographs; collect no material where biosecurity rules prohibit movement.
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
- Field guide to aquatic plants of New ZealandNIWA · Aquatic plant identification and comparison
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 Lagarosiphon- Where is lagarosiphon currently established or emerging in New Zealand?Research question · evidence needed
- What evidence distinguishes current ecological impact from presence alone for lagarosiphon?Research question · evidence needed
Shout Out
Shout Out
Share this record so others can explore the same question, place or ecological work. The link keeps its context and sources together.
Lagarosiphon — The Hit List — NZ Ex Games
Canonical link
/hit-list/weed-lagarosiphon