Skip to main content

Yellow floating heart

(Nymphoides peltata)

Photo of yellow floating heart
Photo credit: Leslie J Mehrhoff, University of Connecticut, Bugwood.org

Perennial, water lily-like plant with long-stalked, heart-shaped leaves. It is sometimes used as a water garden plant and can threaten waterbodies if spread to natural areas.

Overview

Other names for this plant include:
  • Common names: floating heart, fringed water lily, entire marshwort
  • Scientific names: N. natans; N. nymphaeoides; Limnanthemum petlatum
Ecological threat:
  • Invades lakes, riparian zones, watercourses, wetlands.
  • Grows in dense patches, excluding native species and even creating stagnant areas with low oxygen levels underneath the floating mats.
  • Makes recreational activities like fishing, water skiing, swimming, and canoeing difficult, if not impossible.
 Overview map of prohibited classification in WI
Prohibited (red) counties

Classification in Wisconsin: Prohibited

Species Assessment Groups (SAG) were assembled to recommend a legal classification for each species considered for NR 40. The recommendation for yellow floating heart was based upon this literature review [PDF] developed by the department.

Identification

Leaves: Heart-shaped and 3-10 cm across; alternately arranged on the stems and oppositely arranged on the flower stalks. Leaves float on the water surface, have slightly wavy margins and frequently have purplish undersides.

Flowers: 2-5 bright yellow flowers arise from erect flower stalks; 3-4 cm in diameter. Five petals are arranged like the spokes of a wheel, each with a distinctive fringe along the edges.

Fruits & seeds: Fruit is a long-beaked capsule (to 2.5 cm) that splits on one side. One fruit is produced from each flower and contains few to many smooth, shiny seeds with wing-like margins.

Roots: Short, thick clusters of roots originate from modified stems (rhizomes) growing partly or completely below the sediment.

Similar species: Spatterdocks (Nuphar spp.), which have much larger leaves, and cup-like flowers without fringed petals. Water shield (Brasenia schreberi) which has small oval floating leaves often with a jelly-like covering on the undersides, and small purple flowers. Also, other species of Nymphoides (N. aquatica and N. cordatum), which are sold as ornamental plants.

Distribution

See the reported locations of yellow floating heart in Wisconsin.

Do you know of additional populations? Send us a report.

Control

Mechanical: Harvesting can reduce the population, but frequent monitoring and follow-up are required.

Chemical: Aquatic approved herbicides can be very successful. The application must be applied by a licensed applicator and may require a permit.

Photos

View yellow floating heart pictures in our photo gallery!

Resources

Sources for content:
  • Washington State Department of Ecology: Nyphoides peltata [exit DNR]
  • Global Invasive Species Database: Nymphoides peltata [exit DNR]. Last updated September 20, 2006.
  • Massachusetts Department of Conservation and Recreation Office of Water Resources, Lakes and Ponds Program. "Yellow Floating Heart: An Exotic Aquatic Plant", December 2004
Links for more information: