Perianth
Perianth (per"i*anth) , noun
[Prefix peri- + Greek 'anqos flower: compare French périanthe.]
(a)
(Botany) The leaves of a flower generally, especially when the calyx and corolla are not readily distinguished.
(b)
(Botany) A saclike involucre which incloses the young fruit in most hepatic mosses. See Illust. of Hepatica.