Plants of the genus Aponogeton are strictly emersed and cannot live out of water. Aponogeton originally evolved in Australia then migrated all the way to Africa, then migrated back to Australia, leaving species all the way there and back.
Aponogeton distachyos, described in 1792 is the foundation species and exists in the oldest fossils. More recent species have more complex flowers. A. distachyos flowers are sold canned in South Africa where they are one of three ingredients in a regional lamb stew.