What four kinds of flowers does Four Gentlemen in Flowers refer to?

What four kinds of flowers do the four gentlemen of flowers refer to?

1, Meihua: It has a strong, elegant and unyielding flower language.

2. Orchids: bloom from March to May every year, and the meaning of flowers is elegant and virtuous.

3. Bamboo: Its branches and leaves are evergreen all the year round, and it is often used to describe people with high moral character.

4. Chrysanthemum: The pattern is elegant, symbolizing purity and purity.