Definition: Calycanthin is a type of pigment found in certain plants, particularly in the leaves of plants like the Calycanthus and Cypripedium plants. It is composed of a compound called calycanthine which is also known as calycanthin or calycanthinol. The exact mechanism by which these pigments are produced is not fully understood, but it is believed that they may be involved in the regulation of light absorption through their ability to absorb specific wavelengths of light