Nymphaea alba

Nymphaea alba is a perennial aquatic herb in the family Nymphaeaceae. It grows rooted in the bottom by means of a rhizome, an underground stem that spreads through the substrate; Kew characterizes it as a rhizomatous hydrogeophyte. Its leaves grow on long petioles that keep them at the surface. In water lilies, these petioles connect the floating leaves to submerged, fleshy stems anchored in the mud; the blades are generally rounded, waxy, and equipped with air spaces. In this species, the leaf has a deep, narrow notch that is useful for identifying it.

The flowers are solitary, large, white, and fragrant, and are positioned at the water’s surface or just above it. They are cup-shaped, with spirally arranged petals and numerous stamens; the flowers of N. alba are described as large and fragrant, while other sources characterize them as white. Young leaves may show reddish tones. These structures place the flower and foliage at the interface between water and air, while the rhizome remains on the bottom. The species grows in still fresh water, such as ponds and slow-flowing watercourses, and is associated with aquatic environments in temperate regions.

It is a perennial plant: it persists from one year to the next thanks to its rhizome, rather than completing its life cycle in a single season. A description referring to temperate regions of Europe indicates that it flowers between June and September; this timing should not be taken as a universal date for all its populations. Flowering is the seasonal feature of its life cycle documented here. In terms of its native distribution, it extends across Europe as far as the western Himalaya and reaches northwestern Africa. This geographic range, together with its rooted growth and floating leaves, characterizes the species without attributing a presence to it beyond these limits.