Connecticut Plants
Large Water-plantain
Alisma triviale Pursh

Large water-plantain and its relative small water-plantain (Alisma subcordatum) look quite similar. Both plants have small flowers with three petals on greatly branched stems. They differ in the size of the flowers. Large water-plantain petals are around 1/4 inch long; petals of small water-plantain are 1/8 inch or less.

Some of the arrowheads (such as broadleaf arrowhead) resemble water-plantains, but their flowers are much larger (1/2 to 1 inch), and they lack the dense branching of the flower stems that is characteristic of the water-plantains.

  • Family: arrowhead (Alismataceae)
  • Habitat: shallow water, mud
  • Height: 8-36 inches
  • Flower size: 1/4 inch across
  • Flower color: white
  • Flowering time: June to September
  • Origin: native

Large water-plantain flower.


Large water-plantain leaves.


Small water-plantain (Alisma subcordatum).