Sepal

1836, The Family Magazine, Or Monthly Abstract of General Knowledge, Volume III, Redfield & Lindsay, page 367, When the sepals are distinct, or separate from each other, the calyx is said to be polysepalous.

The sepal and the petal are essentially leaf-like in form and anatomy but generally simpler in detailed structure than a foliage leaf.

In tomato, for example, the first sepal primordium is formed as an outgrowth at the periphery of the apex and the subsequent sepal primordia are initiated in a helical fashion at an angle of approximately 137° from the previous one.