Murdannia keisak, Marsh Dewflower

Invasive Species December 16, 2015 Print Friendly and PDF

Invasive Species: Murdannia keisak, Marsh Dewflower

Marsh dewflower (wart-removing-herb) is an annual, emergent plant that invades wetlands in the southeastern and northwestern United States. Plant stems are succulent, form roots at the nodes, and grow prostrate along the ground. Stems are 12-30 in. (30.5-76.2 cm) long. Leaves are alternate, lance-shaped, and up to 3 in. (7.6 cm) long. In September to November, small, pink, 3-petaled flowers occur singly or in small clusters at the apex of the stems and in the leaf axils. The fruit is a capsule that each contains several small seeds. Marsh dewflower invades water edges and marshes and often grows immersed. It forms dense mats that outcompete native vegetation. Marsh dewflower is native to eastern Asia and was accidentally introduced into the United States, in South Carolina, around 1935.

What are invasive species and why should we be concerned about them? 


Taxonomy: Scientific and Common Names for This Species

Commelinales > Commelinaceae > Murdannia keisak (Hassk.) Hand.-Maz.

Synonym(s): aneilima, Asian spiderwort, wartremoving herb, marsh dayflower

Murdannia keisak - USDA PLANTS Profile

Distribution Maps

Marsh dewflower - The reported distribution of this invasive species across the United States (Source: Invasive Plant Atlas of the United States)

Up-to-the-minute distribution maps and why they are important. 

Reporting This Invasive Species

What is the best way and place to report the occurrence of an invasive species? 

 How to report an invasive species sighting to EDDMapS - Early Detection & Distribution Mapping System

EDDMapS - Report an invasive species to EDDMapS.

Cooperative Extension Offices - Find your local Cooperative Extension office on this map provided by USDA.

How to Identify

This invasive species can be identified by looking for the characteristics described in the paragraphs that follow.

Plant

Marsh dewflower is an annual, emergent plant. Plant stems are succulent, form roots at the nodes, and grow prostrate along the ground. Stems are 12-30 in. (30.5-76.2 cm) long.

marsh dayflower marsh dayflower
Nancy Loewenstein, Auburn University, bugwood.org Linda Lee, University of South Carolina, bugwood.org

Foliage

Leaves are alternate, lance-shaped, and up to 3 in. (7.6 cm) long.

marsh dayflower marsh dayflower
Linda Lee, University of South Carolina, bugwood.org Linda Lee, University of South Carolina, bugwood.org

Flower

In September to November, small, pink, 3-petaled flowers occur singly or in small clusters at the apex of the stems and in the leaf axils.

marsh dayflower

marsh dayflower
Linda Lee, University of South Carolina, bugwood.org Linda Lee, University of South Carolina, bugwood.org

Fruit

The fruit is a capsule that each contain several small seeds.

   
bugwood.org bugwood.org

Native Species That Can Resemble Marsh Dewflower

Commelina diffusa, spreading dayflower - Bugwood.org

spreading dayflower spreading dayflower
John D. Byrd, Mississippi State University, bugwood.org Forest & Kim Starr, Starr Environmental, bugwood.org

Commelina erecta, whitemouth dayflower - Bugwood.org

spreading dayflower (Commelina diffusa) whitemouth dayflower
Karan A. Rawlins, University of Georgia,
bugwood.org
Rebekah D. Wallace, University of Georgia, bugwood.org

Additional Images for Marsh Dewflower

Marsh dewflower - Images at Invasive.org

Additional Information, Biology, Control and Management Resources

Control and management recommendations vary according to individual circumstances. Location, habitat, weather, and a variety of other conditions are factors that help determine the best treatment choice. To find the safest and most effective treatment for your situation, consult your state's land-grant institution. If you will use chemicals as part of the control process, always refer to the product label.

United States Land-Grant University System - Find your land-grant university's college of agriculture, Cooperative Extension office, or other related partner on this map provided by USDA.

Plant Invaders of Mid-Atlantic Natural Areas - National Park Service and U.S. Fish and Wildlife Service

Invasive Alien Plant Species of Virginia - Virginia DCR and Virginia Native Plant Society

Archived Invaders of the Month - The MARYLAND INVASIVE SPECIES COUNCIL (MISC)

Invasive Species - The University of Georgia Marine Extension service


Connect with us

  • Twitter
  • Facebook

Welcome

This is where you can find research-based information from America's land-grant universities enabled by eXtension.org

LOCATE

USDA / NIFA

This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.