Vascular Plants of North Carolina
Account for Marsh Dewflower - Murdannia keisak  
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Section 5 » Order Commelinales » Family Commelinaceae
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DistributionMostly Coastal Plain, Sandhills, and Piedmont; scattered in the Mountains.

Native of Asia; in N.A. in the Southeastern states.
AbundanceFrequent to locally abundant, except uncommon or even rare in the Mountains. Individual populations can be enormous and cover the water surface for many square meters. This is a highly invasive species that should be eradicated where it might be impacting rare native species.
HabitatImpoundments, beaver ponds, slow-moving rivers and streams, back-up channels, maple-gum swamps, roadside marshy wetlands, canals.
PhenologyFlowering and fruiting August-October.
IdentificationMarsh Dewflower is an annual aquatic with long floating or stranded shoots (several feet long). The ;eaves are well-spaced and lance-shaped. Solitary flowers grow on short stalks from upper leaf axils and also terminal, various shades of pink or lavender, 3 petals. This species looks like a dayflower (Commelina) or spiderwort (Tradescantia) in bloom, with a flower spread about 1/2-inch across.
Taxonomic CommentsFormerly placed in the genus Aneilema.

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