What is "nymphaea caerulea"

Lotus \Lo"tus\ (l[=o]"t[u^]s), n. [L. lotus, Gr. lwto`s. Cf. Lote.]

1. (Bot.)

   1. A name of several kinds of water lilies; as Nelumbium speciosum, used in religious ceremonies, anciently in Egypt, and to this day in Asia; Nelumbium luteum, the American lotus; and Nymph[ae]a Lotus and Nymph[ae]a c[ae]rulea, the respectively white-flowered and blue-flowered lotus of modern Egypt, which, with Nelumbium speciosum, are figured on its ancient monuments.

   2. The lotus of the lotuseaters, probably a tree found in Northern Africa, Sicily, Portugal, and Spain ( Zizyphus Lotus), the fruit of which is mildly sweet. It was fabled by the ancients to make strangers who ate of it forget their native country, or lose all desire to return to it.

   3. The lote, or nettle tree. See Lote.

   4. A genus ( Lotus) of leguminous plants much resembling clover. [Written also lotos.]

      European lotus, a small tree ( Diospyros Lotus) of Southern Europe and Asia; also, its rather large bluish black berry, which is called also the date plum.

2. (Arch.) An ornament much used in Egyptian architecture, generally asserted to have been suggested by the Egyptian water lily.

Nymphaea caerulea, known primarily as blue lotus (or blue Egyptian lotus), but also blue water lily (or blue Egyptian water lily), and sacred blue lily (or sacred narcotic lily of the Nile), is a water-lily in the genus Nymphaea. Like other species in the genus, the plant contains the psychoactive alkaloid apomorphine. It was known to the Mayan and Ancient Egyptian civilisations.