Blog / Nymphaea caerulea (Blue Water Lily): Botany, Identification & Look-Alikes
Nymphaea caerulea (Blue Water Lily): Botany, Identification & Look-Alikes
Quick answer: Nymphaea caerulea is the scientific name of the blue lotus, also called the Egyptian blue lotus or blue water lily. It is a day-blooming water lily native to the Nile and eastern Africa, with star-shaped sky-blue to lavender flowers and a pale yellow center. Botanists now often list it as Nymphaea nouchali var. caerulea. It is not a true lotus: the pink sacred lotus, Nelumbo nucifera, belongs to a different plant family. This guide covers its botany, how to identify it, and how it differs from look-alikes.
Nymphaea caerulea at a glance
| Scientific name | Nymphaea caerulea Savigny (1798); accepted by many botanists as Nymphaea nouchali var. caerulea (Savigny) Verdc. (1989) |
|---|---|
| Common names | Blue lotus, Egyptian blue lotus, blue water lily, sacred blue lily |
| Family | Nymphaeaceae (the water lily family) |
| Native range | The Nile and much of eastern and southern Africa, plus parts of southern Arabia |
| Habitat | Freshwater lakes, ponds, pools, and slow rivers |
| Flowers | About 8 to 12 cm (3 to 5 in) across, with 14 to 20 pointed petals and 100 to 200 or more stamens |
| Flower color | Pale bluish-white to sky blue or mauve, fading to pale yellow at the center |
| Bloom habit | Day-blooming. Opens mid-morning, closes near dusk, and each flower lasts about four days |
| Leaves | Round floating pads with a slit to the center, roughly 8 to 35 cm across |
| Key compounds | Aporphine alkaloids, including apomorphine and nuciferine, plus flavonoids |
Is blue lotus a lotus or a water lily?
It is a water lily. The name "lotus" comes from history and translation, not botany. Ancient Egyptians revered two water lilies, and early European writers called both of them lotuses. True lotuses belong to the genus Nelumbo, in the family Nelumbonaceae, which is not closely related to water lilies at all. The resemblance is a case of two unrelated plants evolving to thrive in the same kind of habitat.
Blue lotus vs. sacred lotus vs. white lotus
| Blue lotus Nymphaea caerulea |
White Egyptian lotus Nymphaea lotus |
Sacred lotus Nelumbo nucifera |
|
|---|---|---|---|
| Plant family | Nymphaeaceae | Nymphaeaceae | Nelumbonaceae |
| Flower color | Sky blue to lavender, yellow center | White | Pink or white |
| Petal shape | Narrow and pointed, star-like | Broader, rounded tips | Broad, rounded, cupped |
| Blooms | By day | At night | By day |
| Where flowers sit | On or just above the water | On or just above the water | Held high above the water on tall stalks |
| Leaves | Floating, with a slit, smooth edges | Floating, with a slit, toothed edges | Round, no slit, often raised above the water |
| Seed head | Hidden, develops underwater | Hidden, develops underwater | The distinctive "shower head" seed pod |
| Native to | Nile and eastern Africa | Africa and parts of Asia | Asia |
How to identify genuine blue lotus
Living plants
- Pointed, star-shaped petals in sky blue to lavender, turning pale yellow toward the center
- A crowded ring of golden stamens
- Flowers that open in the morning and close by evening
- Round floating leaves with a slit to the center, sometimes purplish underneath
Dried flowers for tea
- Narrow, pointed petals that dry to blue-violet, lavender, or blue-gray
- A cream to golden center packed with stamens
- A sweet, floral, slightly hay-like scent
- No pink petals and no woody seed pods. Those point to Nelumbo lotus instead
Look-alikes are common. Many flowers sold online as blue lotus are other water lilies or hybrids, and some are dyed. Because dried flowers can be hard to tell apart by eye, a laboratory identity test is the most reliable way to confirm you have real Nymphaea caerulea. Our blue lotus tea buying guide explains what to ask sellers for.
Where Nymphaea caerulea grows
In the wild, blue lotus grows in still or slow fresh water along the Nile and across much of eastern and southern Africa. It can be a dominant plant in deeper, nutrient-poor water. Today it is also grown worldwide in ponds, water gardens, and greenhouses. As a tropical water lily, it needs warm water, full sun, and still conditions to bloom well, and in cold climates it is grown as a summer plant or overwintered indoors. Read more in where blue lotus grows and how to grow blue lotus.
The name: a short history
French naturalist Marie Jules César Savigny described the plant as Nymphaea caerulea in 1798, from specimens connected to Egypt. Caerulea is Latin for "sky blue." In 1989, botanist Bernard Verdcourt reclassified it as a variety of the widespread Nymphaea nouchali, which is why you will see both names. Sellers, researchers, and regulators still widely use Nymphaea caerulea, including the Louisiana statute that restricts it.
What is in blue lotus?
Blue lotus contains aporphine alkaloids, most notably apomorphine and nuciferine, which interact with dopamine and serotonin receptors, along with flavonoids and other plant compounds. The amounts vary a lot from plant to plant and product to product. These compounds are the reason blue lotus has a reputation for gentle relaxation. See blue lotus effects for what the research does and does not show.
How people use Nymphaea caerulea
- Tea. The dried flowers are steeped as an herbal tea. See how to make blue lotus tea.
- Ornamental gardening. A favorite tropical water lily for ponds and water features.
- Fragrance. Its sweet scent has been used in perfumes and oils since ancient Egypt. Read about its history in our guide to the Egyptian blue lotus.
Delta North Blue Lotus Tea uses only Nymphaea caerulea flowers, and each batch is lab tested to confirm the plant's identity.
Frequently asked questions
What is the scientific name for blue lotus?
Nymphaea caerulea. Many botanists now classify it as Nymphaea nouchali var. caerulea.
Is the blue water lily the same as blue lotus?
Yes. "Blue water lily," "blue lotus," and "Egyptian blue lotus" all refer to Nymphaea caerulea.
Is Nymphaea caerulea legal?
It is legal to grow and, in most of the United States, to buy as a tea. Louisiana restricts blue lotus products intended for consumption or smoking. Details in Is Blue Lotus Legal?
What does blue lotus smell like?
Fresh flowers have a sweet, delicate floral fragrance. Dried flowers smell softer and a little like sweet hay.
Can you grow blue lotus indoors?
It is possible in a large, sunny container or greenhouse pond, but it needs warm water and many hours of direct sun to flower. Most growers keep it outdoors in summer.
