What is the meaning of Cassia?

The spice made from the bark of members of the genus Cinnamomum other than true cinnamon (C. verum), when they are distinguished from cinnamon.

Such trees themselves, particularly the Chinese cinnamon, Cinnamomum cassia.

Any of several tropical leguminous plants, of the genus Cassia.

Any of several tropical leguminous plants, of the genus Senna.

The sweet osmanthus (O. fragrans).

Chinese cinnamon (Cinnamomum cassia)

golden shower (Cassia fistula)

Source: wiktionary.org