collective term when it comes to outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils
- The leaves of a flower usually specially when the calyx and corolla aren't readily distinguished
- The leaves of a flower usually, especially when the calyx and corolla are not easily distinguished.
- A saclike involucre which incloses the younger fruit in most hepatic mosses. See Illust. of Hepatica.
"envelope of a flower," 1706, from French p
In function the perianth may be compared with a unilocular ovary containing a single ovule; the projecting integument, which at the time of pollination secretes a drop of liquid, serves the same purpose as the style and stigma of an angiosperm.