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  • Najas marina

      Notifiable organism
    • Spiny naiad, holly-leaved naiad, sawtooth

    • Scientific Name: Najas marina
    • Origin: Almost cosmopolitan
    • Type: Weed
    • Plant Life-form Type: Submerged
    • Taxonomy: L.
    • Presence: Not known to be in NZ
    • Habitat: Fresh and brackish water, and may be annual or perennial depending on the seasonality of the habitat
    • Temperature (°C): 16 - 22
    • pH range: 7.0 - 7.5
    • Hardness (ppm): 100 - 200
    • Notes: Potentially a major weed in New Zealand. Often found in stagnant water with a high percentage of organic mud.
    • Propagation: Plant fragments and seed
    • Features: N. marina is a rooted submerged aquatic plant and maybe annual or perennial depending on the habitat. It has stems up to 100 cm long, with a spiny appearance and few roots. The leaves are sessile, seemingly opposite or whorled, linear to lanceolate in shape (up to ca 4 to 6 cm long by 0.5 to 2.5 mm wide) and generally stiff. The leaf margins are coarsely toothed (triangular). Plants are dioecious, the male flowers have a spathe, the female flowers without.
    • Source: TIFBIS
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