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  • Sagittaria platyphylla

      Unwanted Organism, National Pest Plant Accord
    • Sagittaria platyphylla

    • Scientific Name: Sagittaria platyphylla
    • Origin: Native to North America
    • Type: Weed
    • Plant Life-form Type: Marginal erect/tall
    • Taxonomy: (Engelmann) Smith
    • Presence: Locally naturalised, first record from North Shore, Auckland in 1989.
    • Habitat: Still and slow flowing water bodies and wetlands.
    • Temperature (°C): 15 - 25
    • pH range: 7.2 - 8.0
    • Hardness (ppm): 100 - 200
    • Light: Medium
    • Height: 200 - 500mm
    • Difficulty: Less Demanding
    • Notes: Problem in still and flowing water bodies, massive seed output, therefore important to attempt early eradication. A major irrigation weed in Victoria. A swamp plant 20 - 50cm tall from the Mississippi River valley.Submerged leaves as illustrated are 10 - 25cm long & up to 3cm wide relatively thick & turgent & prone to snap (like celery). Emerged leaves are oval to heart-shaped never arrow-shaped.
    • Propagation: Spreads by water dispersed seed, rhizomes, and tubers. Also deliberate planting
    • Features: Emergent perennial herb. Submerged leaves are strap-shaped, 10-50 cm long and 3 cm wide with clearly visible longitudinal veins. Leaves above the water have a long petiole (about 40 cm) which is triangular in cross section and a lance-shaped leaf blade. Flowers are white with 3 petals and about 6 cm across. Tubers form on rhizomes.
    • Source: TIFBIS
    • Regional: Regional Pest Management Strategy: AUK, MWT, WGN, WKO.
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