High Quality Content by WIKIPEDIA articles! Family - Alismataceae. Leaves - Petioles thick, terete, spongy, mostly erect but also reclining, to +.75m. Blades sagittate, glabrous. Inflorescence - Typically shorter than leaves, decumbent. Flowers in whorls or pairs at nodes. Flowers - Perfect. Petals 3, white with yellow base. Sepals 3, green. Pedicels thick, to 5 cm long. Sagittaria montevidensis Cham. & Schl. subsp. calycina (Engelm.) Family - Alismataceae. Leaves - Petioles thick, terete, spongy, mostly erect but also reclining, to +.75m. Blades sagittate, glabrous. Inflorescence - Typically shorter than leaves, decumbent. Flowers in whorls or pairs at nodes. Flowers - Perfect. Petals 3, white with yellow base. Sepals 3, green. Pedicels thick, to 5 cm long.