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plural perianths
(botany) The sterile parts of a flower; collectively, the sepals and petals (or tepals). examples
(botany, bryology) The sterile, tubelike tissue that surrounds the female reproductive structure in a leafy liverwort. quotations
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.
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, page 5