Cycly

Cycly is the count of whorls that a set of floral parts occupies; applied to the perianth specifically, it is the number of whorls of sepals and petals. A uniseriate perianth has just a single whorl of accessory floral parts and is relatively uncommon (Sterculia). A biseriate (dicyclic) perianth has two whorls - an outer, lower one and an inner, upper one - and is the most common condition, as in Hibiscus. A multiseriate (triseriate/tetraseriate) perianth has more than two whorls of non-essential floral parts, as in Chrysanthemum. Separately, a flower is described as dichlamydeous when it has a clearly distinct outer calyx and inner corolla; as homochlamydeous when the perianth is not differentiated into calyx and corolla and instead consists of similar-looking members called tepals (the condition typical of most …