What is "hydrocleys"

Hydrocleys is a genus of aquatic plants in the Alismataceae, native to the Western Hemisphere, though one is naturalized elsewhere and sold as an ornamental for decorative ponds and artificial aquatic habitats. At present (May 2014), five species are recognized:

• Hydrocleys martii Seub. in C.F.P.von Martius - Brazil, Argentina, Uruguay
• Hydrocleys mattogrossensis (Kuntze) Holm-Niels. & R.R.Haynes - Brazil, Bolivia
• Hydrocleys modesta Pedersen - Brazil, Argentina, Paraguay
• Hydrocleys nymphoides (Humb. & Bonpl. ex Willd.) Buchenau - widespread across South America, Central America, Puerto Rico, Trinidad and the Netherlands Antilles. Also naturalized in Australia, New Zealand, South Africa, Fiji, New Caledonia, French Polynesia, Florida, Louisiana and Texas
• Hydrocleys parviflora Seub. in C.F.P.von Martius - Mexico, Central America, Venezuela, Colombia, Bolivia, Brazil