perianth
Noun
Meaning
The leaves of a flower generally, especially when the calyx and corolla are not readily distinguished.
A saclike involucre which incloses the young fruit in most hepatic mosses. See Illust. of Hepatica.
Source: Webster's dictionarySynonyms
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Examples
The immature seeds are infested and desapped by larvae staying in the portion covered by the perianth of the immature seed; the seeds then drop off or survive deformed.
The style is much longer than the perianth, and is initially trapped by the upper perianth parts.
When the styles and perianth parts are different colours, the visual effect is of a colour change sweeping along the spike.