In botany, having seven parts, segments, or whorls, especially referring to flower structures with seven petals or sepals.
From Greek 'hepta' (seven) + 'meros' (part) + Latin '-ous' (having the quality of). Used in botanical classification since the 1800s.
Most flowers have predictable numbers of petals—roses have five, lilies have six—but heptamerous flowers with seven parts are actually quite rare in nature, making them botanically interesting oddities.
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