Sagittaria platyphylla is an rhizomatous aquatic plant that can reach heights up to 150cm (EFloras.org, UNDATED). The Auckland Regional Council (2002) reports that, \"S. platyphylla has fleshy rhizomes that are usually submerged below the water surface, while leaves are held above the surface by rigid stems. There are two kinds of leaves: emergent leaves that are linear to ovate, tapering abruptly to a point with stems that are triangular in cross-section and winged towards the base; and submerged leaves that are strap-shaped. The white or sometimes pink flowers are found in clusters of three-flowered whorls at the end of the flower stem.\" EFloras.org (UNDATED) reports that, \"The Inflorescences are racemes of 3-9 whorls. Flowers can be 1.8cm in diameter and the sepals can be spreading to recurved. Fruiting heads are 0.7-1.2cm in diameter\".
The Auckland Regional Council (2002) reports that, \"S. platyphylla grows in static or slow-moving fresh water such as drains, streams and pond margins, up to a depth of 45cm.\" FNZAS (UNDATED) classifies S. platyphylla as a swamp plant. \"In Australia, S. platyphylla has become increasingly more common in irrigation supply channels, drains, shallow creeks and wetlands\" (Parsons and Cuthbertson, 1992).
The Auckland Regional Council (2002) states that, \"S. platyphylla spreads locally by its creeping root system, and to other areas via seed carried in water, by machinery, wildlife and humans. New infestations can also form via rhizome fragments transported by ditch cleaning machinery and spoil.\" Parsons and Cuthbertson (1992) state that S. platyphylla can spread from seed, and displaced rhizomes and tubers. Entire plants can break free and float to new locations.
Principal source: Auckland Regional Council, 2002. Auckland Regional Pest Management Strategy: 2002-2007.
Compiler: National Biological Information Infrastructure (NBII) & IUCN/SSC Invasive Species Specialist Group (ISSG) with support from the Terrestrial and Freshwater Biodiversity Information System (TFBIS) Programme (Copyright statement)
Review: Dr. Surrey Jacobs Principal Research Scientist Royal Botanic Gardens Sydney NSW, Australia
Publication date: 2006-11-29
Recommended citation: Global Invasive Species Database (2020) Species profile: Sagittaria platyphylla. Downloaded from http://www.iucngisd.org/gisd/species.php?sc=855 on 28-01-2020.