English: Marsh mermaidweed; Common mermaid-weed.
Region: North America, the Caribbean, Central America.
Habitat: swamps, bogs, ponds and marshes.
BotanyHerb.
Leaves: submerged; sessile, 2 to 6 cm long; deeply divided into linear segments; emergent leaves are simply serrated. Fruits: concave sides and sharp or winged angles.