Sagittaria is a genus of about 20 species of aquatic plants whose members go by a variety of common names, including arrowhead, duck potato,iz-ze-kn, katniss, kuwai, swan potato, tule potato, and wapatoo. Several species bear tubers edible as a starchy root vegetable that are collected from the wild or cultivated as crops in North America and East Asia. Description Stock often stoloniferous and tuberiferous. Leaves aerial, floating or submerged. Flowers unisexual or polygamous, in umbela, ra… (More on Sagittaria)