Nymphaea alba (Castalia alba) is common in some parts of Britain, as is also the yellow Nuphar luteum (Nymphaea lutea).
Aquatic plants with floating leaves: Lemna spp., Hydrochcrris Morsus-ranae, Castalia (Nympliaea) alba.
Heterophylly is rather common among aquatic plants, and is well seen in several aquatic species of Ranunculus, many species of Potamogelon, Sagittaria sagittifolia, Scir pus lacusiris, Castalia (Nymphaea) alba, Hippuris vulgaris, Callitriche spp., Sium latifolium.
CASTALIA, or Fons Castalius, a celebrated fountain in Greece, now called the Fountain of St John, which rises in a chasm of Mount Parnassus, in the neighbourhood of Delphi.
According to some authorities the nymph Castalia was the daughter of Achelous; according to others the water of the spring was derived from the Boeotian Cephissus.
Covering the ovary in Nymphaea (Castalia) and Nelumbium may be regarded as a form of disk.