|Connecticut Botanical Society|
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Large water-plantain: Alisma triviale
Small water-plantain: Alisma subcordatum
The water-plantains have small flowers with three petals on greatly branched stems. The two species that grow in Connecticut look very much alike, other than the size of the flowers. Large water-plantain flowers are 1/4 inch wide; those of small water-plantain are less than 1/8 inch wide.
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: Water-plantain (Alismataceae)
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