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 Perianth of a flower

The perianth is the outer envelope enclosing a flower and is made up of either:

  • an outer calyx and inner corolla;
  • a calyx or corolla; or
  • calyx and corolla combined and undifferentiated from one another. 

The corolla of a flower is divided up into petals whereas the calyx (which usually encloses the corolla at its base) is made up or sepals. If the calyx and corolla are combined into one undifferentiated unit, then the individual parts are referred to as tepals.

Aptosimum flower (Scrophulariaceae) showing perianth made up of calyx and corolla. Petals are fused into a tube.

Agapanthus flower. Calyx and corolla are undifferentiated from one another, hence use to term tepal instead of sepal or petal.

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