Definition: Calliana is a genus of flowering plants in the family Apiaceae, native to tropical regions around the world. It contains over 75 species and is known for its distinctive leaves that are often arranged in groups called "calli." These calli are typically green or brown, with a slightly serrated surface and sometimes a central vein. Calliana flowers are usually solitary or in clusters on stems, and their fruit is a small, oval-shaped seed.