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How do mature fruits of the mint family usually separate into four nutlets?
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Lamiales
The lilac-pink flowers of the water mint attract butterflies and beetles.
In the Lamiaceae (mint) family, the ovary is composed of two carpels that are divided by secondary partitions to create four distinct chambers, each containing a single seed. When the fruit reaches maturity, it typically splits along these partitions, allowing it to separate into four individual, one-seeded nutlets.1