Abh. Math.-Phys. Cl. Königl. Akad. Wiss. 1: 365 (1832) APNI
Rhizomes vertical, to c. 30 cm long, c. 4 cm thick, with long horizontal stolons produced at apex; new plants produced at nodes of stolons. Leaves suborbicular with a radial sinus, to c. 25 cm diam., dark green and brown-blotched above, crimson-brown with blackish dots below, margins obscurely and finely sinuate. Flowers to c. 12 cm diam., borne up to 12 cm above the water on rigid pedicels, closing at night; sepals 4, green; petals c. 25, elliptic, acute, bright yellow, passing into petaloid stamens; stamens c. 50, yellow; ovary lobes large with stigmatic surface on lower 60%. Berry ovoid, c. 2.5 cm long; seeds (rarely formed in Australia) many, c. 5 mm long or more. Flowers mostly summer.
*VRiv. Also naturalised Qld, NSW. Native of Mexico. So far recorded as naturalised in Victoria only along an anabranch of the Goulburn River near Nagambie, where the infestation is expanding rapidly, and near Glenthompson. It is potentially a very troublesome weed that can block waterways and eradication has proved difficult.
The taxonomy of the species is under review and the above description includes hybrids derived from N. mexicana.
|Bioregion||Occurrence status||Establishment means|
|New South Wales|
|Australian Capital Territory|