Fringed Water Lily

Also known as:
Entire Marshwort, Yellow Floating Heart
Family:
Menyanthaceae
Origin:
Europe & Asia

General description

Robust freshwater bottom- rooted perennial. Long branched creeping stems below water surface produce mats of floating leaves, thread-like roots. Heart- shaped leaves, scalloped edges <7cm wide. Leaf upper surface green, occasional reddish-brown flecks; undersides reddish-pink to reddish-purple. Golden-yellow 5- lobed flowers (Oct-Apr) in clusters above water surface; fringed wing on flowers distinguishes it from other water lilies. Abundant, hairy-edged seeds in flattened green capsules.

Flowing to static freshwater <2.5m deep: ponds, lakes, dams. Grows on damp mud. Prefers warmer climate.

Seeds spread by water; hairs on seeds aid dispersal by waterfowl. Localised vegetative spread from creeping stems.

Dense vegetation blocks waterways impeding drainage, disrupting recreational activities, choking hydro turbines. Out-competes native species

Site management

Regular follow up required. Clean all boats, trailers fishing gear etc.

Recommended approaches

1. Report it immediately to the ARC, who will arrange for its control at their expense.
2. Hand clear small infestations.
3. Weedmat larger sites.
4. Spray emergent foliage (200ml glyphosate/10L, use glyphosate formulation approved for use over water). Repeat as necessary.

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

Similar species

yellow water lily
Nuphar lutea

Yellow water lily has thick spongy stolons and larger floating leaves.

marshwort
Nymphoides geminata

Marshwort has rounded leaf margins as opposed to scalloped. Lacks reddish-brown flecks on top of leaf.

water poppy
Hydrocleys nymphoides

Water poppy has the inflated mid vein on the underside of the leaf.

Mexican water lily
Nymphaea mexicana

Mexican lily has thick rhizomes rather than thin stolons.

Search tags

RPMS status

Surveillance - Whole Region
National Pest Plant Accord species - nationwide
fringed water lily - Main species image