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Variation of petal numbers in sectors of sepals 1–5 in the examined material of the two species of Nuphar.
| Sector of sepal 1 | Sector of sepal 2 | Sector of sepal 3 | Sector of sepal 4 | Sector of sepal 5 | |
| N. lutea | 3 | 3–4 | 3–4 | 2–3 | 2–3 |
| N. pumila | 2–3 | 3 | 3 | 2 | 1–2 |
