Water chestnut, floating water chestnut
- Scientific Name: Trapa natans
- Origin: Asia, Europe, Africa
- Type: Weed
- Plant Life-form Type: Floating-leaved
- Taxonomy: L.
- Presence: Not known to be in NZ
- Habitat: Lakes, ponds, canals and slow moving water.
- Notes: Potentially a major weed in New Zealand
- Propagation: Plant fragments and seed set
- Features: Plants have toothed diamond shaped upper leafs that float on the water surface forming a rosette. They are arragned on spongey/swollen stalks. The stems give rise to long, narrow or feather like underwater laves and are rooted in the sediment. The fruit is a large (2.5 cm) hard, woody nut with spines (2 to 4) that are sharp.
- Source: TIFBIS