Only flowering plants produce sepals, which are green-coloured vegetative parts of plants. The flower's outermost layer, known as the calyx, encloses the flower bud and is its outermost layer. A stamen is the leaf-like part of a flower. Parenchyma, secretory cells are known as laticifers, tannin cells, and other specialised plant cell organelles make up the majority of the sepals. Depending on the plant species, the sepals have a wide range of colours. The cells of green sepals contain chloroplasts, separate palisade, and spongy mesophylls.