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Calyx vs Perianthe - What's the difference?

calyx | perianthe |

calyx

English

(wikipedia calyx)

Noun

(en-noun)
  • (anatomy) A cup-like structure in the mammalian kidney.
  • (botany) The outermost whorl of flower parts, comprising the sepals, when it is not the same in appearance as the next such whorl (the corolla).
  • (zoology) The crown of a crinoid.