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Term Definition
Biseriate perianth Referring to a perianth with two whorls or rows; i. e. with both calyx and corolla. Compare with uniseriate. Parts of the perianth. Drawing by B. Angell
Perianth The collective term for the calyx and the corolla, even when they are not differentiated (i.e., represented by tepals). Parts of the perianth. Drawing by B. Angell
Uniseriate perianth Referring to a perianth with a single whorl composed of either the calyx or the corolla; e.g., the perianth of Nyctaginaceae and Thymelaeaceae. Flowers of two species of Myristicaceae. Photos by C. A. Gracie.