marsh dayflower: Murdannia keisak (Commelinales: Commelinaceae): Invasive Plant Atlas of the United States

marsh dayflower	USDA PLANTS Symbol: MUKE U.S. Nativity: Exotic Habit: Forbs/Herbs
Murdannia keisak (Hassk.) Hand.-Maz.

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Taxonomic Rank: Liliopsida: Commelinales: Commelinaceae
Synonym(s): marsh dewflower, aneilima, Asian spiderwort, wartremoving herb, marsh dayflower
Native Range: Temp. & trop. Asia (GRIN);
Appearance Murdannia keisak 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. Foliage Leaves are alternate, lance-shaped, and up to 3 in. (7.6 cm) long. Flowers From 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. Fruit The fruit is a capsule that contains several small seeds. Ecological Threat M. keisak invades water edges and marshes and often grows immersed. It forms dense mats that out-compete native vegetation. M. keisak is native to temperate and tropical Asia and was accidentally introduced into the United States, in South Carolina, around 1935.

Identification, Biology, Control and Management Resources

Invasive Alien Plant Species of Virginia - Virginia DCR and Virginia Native Plant Society
Plant Invaders of Mid-Atlantic Natural Areas - National Park Service and U.S. Fish and Wildlife Service

Selected Images from Invasive.org

View All Images at Invasive.org

Plant(s); in flower Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage	Flower(s); Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage	Flower(s); Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage	Plant(s); in flower Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage
Plant(s); in flower Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage	Plant(s); Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage	Flower(s); Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage	Plant(s); Linda Lee, University of South Carolina, Bugwood.org Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org