1. Sepals: These are the outermost, usually green, leaf-like structures that enclose the flower bud before it opens. They protect the developing flower.

2. Petals: These are the colorful, often fragrant parts of a flower that attract pollinators like bees and butterflies.

3. Stamens: These are the male reproductive parts of a flower. Each stamen consists of an anther (which produces pollen) and a filament (which supports the anther).

4. Pistil: This is the female reproductive part of the flower. It consists of the stigma (which receives pollen), style (which connects the stigma to the ovary), and ovary (which contains the ovules that become seeds after fertilization).