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Broadleaf arrowhead is an herbaceous perennial that produces a large underground storage organ in the form of a corm.
Basal leaves arise from the corm. Petioles measure approximately 20-30 inches in length. Leaf blades are arrowhead-shaped and 1.5-2 feet long by 6-12 inches wide.
Inflorescences are large groups of flowers measuring 2 inches in diameter. Flowers have three white petals and three green sepals and are either male or female. Flowering and fruiting occurs from summer to fall.
Plants live in ditches, marshes, and pools and along the banks of streams and lakes.