Plant to 1 m or so tall. Leaves ovate, blades 10-20 cm long, 7-10 cm wide, base cordate to truncate. Flower clusters in 2-6 whorls with 5-15 flowers per whorl; summer. Flowers about 1.5 cm wide on stalks to 6 cm long. Stamens 12-20. Fruits 2-3.5 cm long, beaked.
E. osiris Rataj from Brazil is also available.
Source: (2005). Alismataceae. In: . Horticultural Flora of South-eastern Australia. Volume 5. Flowering plants. Monocotyledons. The identification of garden and cultivated plants. University of New South Wales Press.