Abstract
Hybridization has long been used as a means of producing new Nymphaea L. cultivars for ornamental ponds. Most Nymphaea hybrids involve interspecific crosses between closely related species, although more distant crosses were claimed (but not substantiated) by J.E. Planchon, W.E. Sturtevant, and W. Tricker (Conard, 1905). Notably, several intersubgeneric crosses in Nymphaea were reported by J.B. Latour-Marliac (subgenera LotosDC. and Nymphaea) and O. Ames (subgenera Lotos DC. and Hydrocallis (Planch.) Conard) (Ames, 1900; Grey, 1900). However, Conard (1905) dismissed the validity of these claims due to a lack of evidence of pollen parentage and, in some cases, strong indications that traits were inherited from related species within the same subgenus. A successful cross between Nymphaea subgenera has been verified recently using molecular genetic techniques (Les et al., 2004). This novel hybrid is newly described here as Nymphaea ʻWilliam Phillipsʼand not only represents the first proven intersubgeneric cross in the genus, but also is a tropical water-lily with highly desirable ornamental qualities.
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