The perianth consists of a valvate calyx with usually 5 distinct or basally connate sepals and a corolla of an equal number of petals or sometimes the corolla is sepaloid or absent. The androecium consists of usually many stamens that are distinct or basally connate or in fascicles. The fruit is variable. Corchorus olitorius, jute. Note the 5 or 6-merous, differentiated perianth and numerous stamens.
Conspicuous stipules are also visible.
Triumfetta semitriloba, Sacramento bur. Note the five-merous perianth whorls. In this case the calyx is somewhat petaloid, at least on the front surface. In this species the perianth is 4-merous and the sepals are petaloid. Numerous stamens are evident.