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  • Hydrocleys nymphoides

      Unwanted Organism, National Pest Plant Accord
    • Water poppy

    • Scientific Name: Hydrocleys nymphoides
    • Origin: Native to tropical South America
    • Type: Weed
    • Plant Life-form Type: Floating-leaved
    • Taxonomy: (Humb. et Bonpl.) Buchneau
    • Presence: Locally naturalised, eradicated from most known sites, first record from Te Aroha, Waikato in 1914
    • Habitat: Still and flowing water bodies
    • Temperature (°C): Oct-22
    • pH range: 6.8 - 7.2
    • Hardness (ppm): 50 - 200
    • Light: Strong
    • Height: 100mm
    • Difficulty: Easy
    • Notes: Problem weed in still and flowing water bodies, poor dispersal capacity has limited spread. Introduced into NZ now an aggressive coloniser of ponds streams farm dams & lake margins to a depth of 2 metres. Found Rotorua Waikato Auckland Lake Rotoehu
    • Propagation: Vegetative spread by stolon fragments, deliberate planting
    • Features: Underwater stem is elastic, creeping, or floating near the water surface. Leaves and roots attached at each node along the stem. Leaf is a bright glossy green, oval, 7 cm long, and with an inflated main vein on the underside. The leaf sinus is shallow. Flowers consist of 3 yellow petals with a purple centre (filaments) and are up to 8 cm across.
    • Source: TIFBIS
    • Regional: Regional Pest Management Strategy: AUK, BOP, NTL, WKO.
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