Nuphar lutea

Notifiable Organism, Unwanted Organism, National Pest Plant Accord

• yellow water lily, brandy bottle

• Scientific Name: Nuphar lutea
• Origin: Native to Eurasia and northern Africa
• Type: Weed
• Plant Life-form Type: Floating-leaved
• Taxonomy: (L.) Sm.
• Presence: Two field sites targeted for eradication, first record from Horseshoe Lake, Hawkes Bay in 1975
• Habitat: Still and slow flowing water bodies
• pH range: 6.8 - 7.0
• Hardness (ppm): 50 - 80
• Light: Strong
• Height: 100 - 300mm
• Difficulty: Less Demanding
• Notes: Problem in still water bodies, poor dispersal capacity has limited spread. Submerged leaves in rosettes are light green and thinly membranous and transparent deeply cordate 10 - 30cm long and wide. A young rhizome may live for a few years. The formation of floating leaves is inhibited by a poor planting medium. Requires good light.
• Propagation: Rhizome fragments and seed
• Features: Stout spongy, tuberous rhizome that is up to 10 cm across. The floating leaf is ovate, with entire leaf margins, a deep sinus, and up to 30 cm long. The submerged leaf is very thin and lettuce-like. Flower is golden yellow with 6 petals and up to 6 cm across with a strong alcoholic aroma. The flower is held above the water surface by a stout stalk.
• Source: TIFBIS
• Regional: Regional Pest Management Strategy: HKB, AUK.