Great reedmace is recorded by a competent New Zealand authority as an introduced, invasive or managed threat subject. Source context (Auckland Council): Perennial aquatic reed, less than 3 m tall. Rhizomes form a thick mat; leaves are broad, flat, stiff and pale grey-green. Erect dark brown/black sausage-shaped flower spikes are diagnostic; tufted fruits appear in early summer.
The source identifies ecological, biosecurity or habitat risks that make this subject relevant to NZ Ex Games intelligence.
Distribution and current presence are place-specific and must be established from current authoritative or verified evidence.
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These are parts of the public picture that could become clearer with better evidence.
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Great reedmace — The Hit List — NZ Ex Games
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/hit-list/weed-great-reedmace