The Plant List, created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden recognizes about 70 species in 11 genera within the order, but a phylogenetic study of the genus Nymphaea implies that the number of species could be more than 90. The difference in species numbers is due almost entirely to the difficulty of delineating species...
Found on
http://en.wikipedia.org/wiki/Nymphaeales
the water-lily order of flowering plants, belonging to the class called dicotyledon (characterized by two seed leaves). The order is composed of ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/n/65
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