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  • Sagittaria sagittifolia

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

    • Scientific Name: Sagittaria sagittifolia
    • Origin: Native to Asia and Europe
    • Type: Weed
    • Plant Life-form Type: Marginal erect/tall
    • Taxonomy: L.
    • Presence: Locally naturalised, first record from Coromandel Peninsula in 2002.
    • Habitat: Still and slow flowing water bodies and wetlands.
    • Temperature (°C): Dec-24
    • pH range: 7.2 - 8.0
    • Hardness (ppm): 100 - 150
    • Notes: A potentially important irrigation weed; poor dispersal capacity has limited current spread. This species has been included in this survey only to demonstrate a use most Sagittarias have in SE Asia. The rootstock or corm of many Sagittaria species & particularly S. sagittifolia is farmed as an edible vegetable somewhat like taro. I have also used its emerged leaf form to illustrate the extremes in shape.
    • Propagation: Apparently by deliberate planting and subsequent spread by water movement. Possibly cultivated as a vegetable by some ethnic groups
    • Features: Tall summer-green perennial dying back to underground parts over winter. Emergent leaves have a distinctive glossy arrow-shape with long basal lobes. Petioles are triangular in cross-section. Rhizomatous with round tubers, up to 3 cm across, produced on these. No flowers seen on New Zealand material.
    • Source: TIFBIS
    • Regional: Regional Pest Management Strategy: AUK, WKO, WGN.
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