Habit: Nymphoides grayana grows as a perennial herb from with a basal rosette of leaves that float at the waters surface. The leaves are orbicular/cordate to 10 cm across with a rounded to round leaf apex an entire sometimes repand leaf margin.
The complete, perfect, actinomorphic flower is solitary and raised above the water surface emerging from near the leaf blade. The calyx has 5 fused green sepals. The corolla has 5, pubescent, yellow petals. There are 5 stamens and 5 staminodes. The ovary is superior and has 1 locule containing numerous ovules. The fruit is a capsule at maturity.
Flowers emerge from the water in the mornings and when pollinated sink below the water surface before the end of the day.
Habitat: Nymphoides grayana grows in Fresh Water Wetlands.
Distribution: Nymphoides grayana occurs in the northern island groupings of the Lucayan Archipelago, Cuba and Florida.
Medicinal/Cultural/Economic usage: Nymphoides grayana is not known to be used medicinally in the Lucayan Archipelago.