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How are the two lips of a typical Lamiales flower formed?

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Water mint (Mentha aquatica) — Lamiales The lilac-pink flowers of the water mint attract butterflies and beetles.

In many species within the Lamiales order, the corolla is bilaterally symmetric and formed into two distinct lips. These lips are composed of the flower's petals: the upper lip is formed by two petals, while the lower lip is formed by three petals.1

While this structural arrangement is characteristic of many members of the order, the number of petals contributing to each lip is not always visually obvious. Additionally, the size of these lips can vary, with some species displaying lips of equal size and others featuring one lip that is markedly larger than the other.1