In botany, having seven petals.
From Greek 'hepta' (seven) + 'petalous' (having petals, from 'petalon', leaf). A descriptive botanical term for flower structure.
Seven-petaled flowers are surprisingly rare—most flowers follow patterns of five, six, or other numbers—so when botanists see a heptapetalous flower, it's noteworthy and helps identify unusual plant species.
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