the.com/calyx

The flower's bodyguard — sepals that take the bruises so petals can show off.

means The outer ring of sepals that encloses and protects a flower bud before it opens.

from From Greek kalyx, meaning 'husk,' 'cup,' or 'covering' — related to the verb kalyptein, 'to cover or conceal' (the same root that gives us 'apocalypse,' literally an 'uncovering'). The Greeks saw the bud-casing as a little cup holding the flower, and the word passed into Latin as calyx before entering botanical English largely unchanged.

etymology
Greek for husk or cup
job
protects the bud before it opens
made of
sepals, fused or separate
bonus role
in kidneys, collects urine too
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