European Water Clover

European Water Clover

(Marsilea quadrifolia)
*Detected in Michigan*
WATCH LIST

This species is currently allowable for sale and possession in Michigan. If these plants are observed outside of cultivation, please report to:

DEQ Aquatic Invasive Species Program DEQ-WRD-ANC@michigan.gov 517-284-5593

If possible, please take one or more photos of the invasive species you are reporting. Also make note of the location, date and time of the observation. This will aid in verification of your report. You may be asked to provide your name and contact information if follow-up is needed.

- Or - use the Midwest Invasive Species Information Network (MISIN) online reporting tool 

- Or - download the MISIN smartphone app and report from your phone - http://www.misin.msu.edu/tools/apps/#home

Identification:

  • Resembles a four leaf clover
  • Leaves are smooth and can be floating, submerged, or emergent
  • Maximum height: 8 inches
  • Thin green stalks bear a single leaf

European water clover
Marsilea quadrifolia 2, Saxifraga – Jasenka Topic

European water clover
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

European water clover
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Habitat: This aquatic fern anchors into sediment in shallow, slow-moving waters. Preference is given to sandy and loamy soil environments with semi-shade to full sun.

Native Range: Europe and Asia

U.S. Distribution: Reported in Ohio, Illinois, Iowa, Michigan, and Missouri with widespread occurrences in the northeastern states.

Local Concern: European water-clover has the ability to form dense, monospecific stands by outcompeting native aquatic species. Its ability to adjust the angle of floating leaflets to optimize sunlight gives it even more of a competitive edge over native species.

Other Common Names: Four-leaf clover, Pepperwort, Water shamrock

MORE INFORMATION:

European Water-clover Invasive Species Alert - Printable PDF