Having nine sepals; used in botanical descriptions of flowers with nine cup-like leaf structures.
From Greek 'ennea' (nine) + 'sepalon' (sepal, a part of the calyx), with '-ous' forming the adjective. This technical botanical term describes specific flower anatomy.
Sepals are the small leaf-like structures protecting a flower bud, and most flowers have 4, 5, or 6—so a flower rare enough to need the term 'enneasepalous' (nine sepals) has an unusual anatomy that botanists can instantly recognize by name.
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