Menyanthes/Vallarsia (which includes Nymphoides) grows all over the world... Europe, Africa, Australia, India. It is both white and yellow.
The New World gulf species is so similar to the Old World species, botanists actually thought it was an Old World plant that had been brought over with the colonists. It was not until they studied the genetics that they discovered it was native to the New World. So... some of the Old World and New World species are so similar, visual inspection isn't enough to tell them apart.
The New World gulf species is so similar to the Old World species, botanists actually thought it was an Old World plant that had been brought over with the colonists. It was not until they studied the genetics that they discovered it was native to the New World. So... some of the Old World and New World species are so similar, visual inspection isn't enough to tell them apart.