Corsiaceae is a family of monocotyledonous plants that are part of the order Liliales. It includes two genera: Corsia and Arachnitis, with a total of about 30 known species. These plants are found primarily in the tropical regions of the world, particularly in Southeast Asia, New Guinea, and South America.

Corsiaceae are characterized by their unique morphology and reproductive structures. They have small, simple leaves that are arranged spirally around a short stem. The flowers are typically large and showy, with six tepals (three sepals and three petals) that are fused together at the base. The stamens and carpels are also fused together to form a central column called a gynostemium.

One of the most distinctive features of Corsiaceae is their reproductive biology. They are insect-pollinated, but unlike most other flowering plants, they do not produce nectar as a reward for pollinators. Instead, they have specialized structures called elaiosomes on their seeds that attract ants. The ants carry the seeds to their nests, where they consume the elaiosomes and discard the seeds in their waste, helping to disperse them.

Corsiaceae are of interest to evolutionary biologists because they have a number of unique features that suggest they may represent a separate lineage within the monocots. However, their exact relationships to other plant groups are still not well understood and are the subject of ongoing research.