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).