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The perianth of this flower includes the pale petals and the green sepals. The flower's organs hidden behind the petals in this photograph, namely the stamens and pistil, are not part of the perianth.
A mature spore of the liverwort Blepharostoma trichophyllum in its perianth


From French périanthe, from New Latin perianthium, from Ancient Greek περιανθής (perianthḗs, with flowers all around). By surface analysis, peri- +‎ -anth. Doublet of perianthium.


perianth (plural perianths)

  1. (botany) The sterile parts of a flower; collectively, the sepals and petals (or tepals).
  2. (botany, bryology) The sterile, tubelike tissue that surrounds the female reproductive structure in a leafy liverwort.
    • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 5:
      Archegonia are surrounded early in their development by the juvenile perianth, through the slender beak of which the elongated neck of the fertilized archegonium protrudes.


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