Which part of the flower is usually green in color?
Sepals
In a typical flower, there are four kinds of whorls. These whorls are successively arranged on the swollen end of the stalk or pedicel. The outermost whorl of a flower is called calyx. It is composed of sepals. Sepals are usually green and leaf-like structures. The sepals protect the flower during the bud stage. Petals are usually large, showy and brightly coloured to attract pollinators. Stamen and carpel are the male and female reproductive parts of the flower respectively.