Virginia Tech Weed Identification Guide

Marsh Dayflower, Asian Dayflower, or Asian Spiderwort:

 Murdannia keisak

Weed Description:  A succulent annual that is usually emersed and grows along stream banks, swamps, and along the edges of ponds and lakes.  Found primarily in the piedmont and coastal plain regions of the southeastern United States.
Leaves: Alternately arranged, lanceolate in outline, up to 3 inches long and 5 mm wide.  The bases of the leaves clasp and surround the stems.

Stems: Succulent, rooting at the nodes.  Stems grow prostrate along the ground and eventually ascend to approximately 18 inches in height.

Fruit:  A capsule that is approximately 1/3 inch long.

Flowers: The flowers occur at the ends of the stems or arise from the position between the stems and leaves (leaf axils).   Flowers can occur singly or in clusters of 2 to 4.  All flowers occur on short flower stalks (pedicels) and consist of 3 pink to purple petals that are approximately 1/3 inch long.
Identifying Characteristics:   Emersed aquatic plants that usually grow along the edges of ponds, lakes, or in marshes.  Additionally, the stems that root at the nodes, lanceolate leaves, and flowers with 3 pink to purple flowers are all characteristics that help in the identification of marsh dayflower.