Virginia Tech Weed Identification Guide

American Water Plantain: Alisma subcordatum

Weed Description:  Aquatic perennial with erect or floating leaves.  Found in shallow water, marsh areas, and pond and stream borders from Massachusetts to Minnesota and from Florida to Texas.
Leaves:  Oval or elliptic, approximately 1 1/4 to 8 inches long, 1 1/4 to 6 inches wide, and sharply pointed at the leaf apex (acute).  Leaves have petioles that are often longer than the leaf blade.
Flowers:  Occur on flowering stems (scapes) in panicles with whorled branches of flowers within each panicle.  Flowering stems (scapes) range from 4 inches to 21 inches in height and are spreading.  Petals are 1 to 2 mm long and pink in color.

Fruit:  An achene approximately 1.5 to 2.5 mm long.

Identifying Characteristics:  Aquatic plants that are found in shallow water and resemble the common plantain weeds often found in turfgrass and lawns.