The outermost whorl of a flower, composed of sepals that typically protect the flower bud before it opens. It's usually green and leaf-like but can be colorful in some species.
From Greek 'kalyx' meaning 'cup' or 'covering,' referring to how sepals cup around and protect the developing flower bud. The term has been used in botany since the 17th century.
The calyx is like nature's packaging material - it wraps up the precious flower parts like bubble wrap, but unlike human packaging, it often stays beautiful and functional even after 'unboxing'!
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