Commemorating Giuliano Pontedera (1688–1757), Professor of Botany at Padua.
Perennial herbs with submerged, floating or creeping stems. Leaves floating, submerged or emergent, linear or stalked. Flowers in a spike, blue; summer. Perianth of 2 lips, each with 3 lobes. Stamens 6. Fruit a nutlet.
Grown for the strong foliage and spikes of blue flowers.
Division, cuttings or seed.
P. cordata has an edible 1-seeded fruit.
Flowers 2-lipped with each lip having 3 lobes, the lowermost more deeply cut.
6 species from North and South America and Caribbean. Australia has 1 naturalised species.
Source: (2005). Pontederiaceae. 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.