|Nymphaea 'Peach Glow'|
About 36 species, see text
Nymphaea // is a genus of hardy and tender aquatic plants in the family Nymphaeaceae. The genus has a cosmopolitan distribution. Many species are cultivated as ornamental plants, and many cultivars have been bred. Some taxa occur as introduced species where they are not native, and some are weeds. Plants of the genus are known commonly as water-lilies. The genus name is from the Greek νυμφαια, nymphaia and the Latin nymphaea, which mean "water-lily" and were inspired by the nymphs of Greek and Latin mythology.
Water-lilies are aquatic rhizomatous perennial herbs, sometimes with stolons, as well. The leaves grow from the rhizome on long petioles. Most of them float on the surface of the water. The blades have smooth or spine-toothed edges, and they can be rounded or pointed. The flowers rise out of the water or float on the surface, opening during the day or at night. Many species of Nymphaea display protogynous flowering. The temporal separation of these female and male phases is physically reinforced by flower opening and closing, so that the first flower opening displays female pistil and then closes at the end of the female phase, and reopens with male stamens. Each has at least 8 petals in shades of white, pink, blue, or yellow. There are many stamens at the center. Water-lily flowers are entomophilous, meaning they are pollinated by insects, often beetles. The fruit is berry-like and borne on a curving or coiling peduncle.
Water-lilies are not only decorative, but provide useful shade which helps reduce the growth of algae in ponds and lakes. Many of the water-lilies familiar in water gardening are hybrids and cultivars. The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:
- 'Escarboucle' (orange-red)
- 'Gladstoniana' (double white flowers with prominent yellow stamens)
- 'Gonnère' (double white scented flowers)
- 'James Brydon;' (cupped rose-red flowers)
- 'Marliacea Chromatella'' (pale yellow flowers)
- 'Pygmaea Helvola' (cupped fragrant yellow flowers)
Water-lilies have several edible parts. The young leaves and unopened flower buds can be boiled and served as a vegetable. The seeds, high in starch, protein, and oil, may be popped, parched, or ground into flour. Potato-like tubers can be collected from the species N. tuberosa.
This is one of several genera of plants known commonly as lotuses. It is not related to the legume genus Lotus or the Chinese and Indian lotuses of genus Nelumbo. It is closely related to Nuphar lotuses, however. In Nymphaea, the petals are much larger than the sepals, whereas in Nuphar the petals are much smaller. The process of fruit maturation also differs, with Nymphaea fruit sinking below the water level immediately after the flower closes, and Nuphar fruit remaining above the surface.
Subdivisions of genus Nymphaea:
- section Chamaenymphaea
- section Nymphaea
- section Xanthantha
The flowers of the Egyptian blue water-lily (N. caerulea) open in the morning and then sink beneath the water at dusk, while those of the Egyptian white water-lily (N. lotus) open at night and close in the morning. Egyptians found this symbolic of the separation of deities and of death and the afterlife. Remains of both flowers have been found in the burial tomb of Ramesses II.
A Syrian terra-cotta plaque from the 14th-13th century B.C.E. shows the goddess Asherah holding two lotus blossoms. An ivory panel from the 9th-8th century B.C.E. shows the god Horus seated on a lotus blossom, flanked by two cherubs.
Water lilies are also used as ritual narcotics. This topic "was the subject of a lecture by William Emboden given at Nash Hall of the Harvard Botanical Museum on the morning of April 6, 1979".
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