Part of a flower, usually green, that surrounds and protects the flower in bud. The sepals are derived from modified leaves, and are collectively known as the calyx.
In some plants, such as the marsh marigold Caltha palustris, where true petals are absent, the sepals are brightly coloured and petal-like, taking over the role of attracting insect pollinators to the flower.
The flag was said to represent the nation's hope for a green revolution in agriculture. Green expresses the people's Muslim faith. Effective date: 20 November 1977.