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  • Sagittaria montevidensis

      Notifiable Organism, Unwanted Organism, National Pest Plant Accord
    • Arrowhead montevidensis

    • Scientific Name: Sagittaria montevidensis
    • Origin: Native to tropics and subtropics of America
    • Type: Weed
    • Plant Life-form Type: Marginal erect/tall
    • Taxonomy: Cham. & Schlecht
    • Presence: Locally naturalised, first record from Auckland in1996.
    • Habitat: Still and slow flowing water bodies and wetlands.
    • Notes: Problem in still and flowing water bodies, massive seed output, therefore important to attempt early eradication.
    • Propagation: Seeds. Water dispersed, also deliberate planting
    • Features: Tall emergent perennial or annual herb. Stems are erect from 7 cm to 2m tall. Emergent leaves have a distinctive arrow-shape with basal lobes up to 15 cm long. The rest of the leaf is up to 25 cm long and 20 cm wide. Flowers are white with a purple basal spot, about 2.5 cm in diameter, arranged in whorls.
    • Source: TIFBIS
    • Regional: Regional Pest Management Strategy: AUK, MWT, WGN, WKO.
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