Arrow Arum (Peltandra virginica)

Where to plant: a few inches below high-water mark; leaves must be above water
Type: herbaceous perennial
Height x spread:   1.5-2.0 x 1.5-2.0 ft
Blooms late spring, early summer
Bloom showy, greenish-white to greenish-yellow
Sun: tolerates partial shade, but young seedlings need some direct sunlight​
Water:  wet
Maintenance: medium
Wildlife: provides cover for water fowl, wading birds, & insects.

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https://pondmegastore.com/products/arrow-arum

https://en.wikipedia.org/wiki/Peltandra_virginica