Elaiosome

Elaiosomes (Ancient Greek: ἔλαιον élaion "oil" + σόμα sóma "body") are fleshy structures that are attached to the seeds of many plant species.

This type of seed dispersal is termed myrmecochory from the Greek "ant" (myrmex) and "circular dance" (khoreíā).

[1] The various origins and developmental pathways apparently all serve the same main function, i.e. attracting ants.

[2] The particular elaiosome in the spurge family Euphorbiaceae is called caruncle (Latin caruncula "wart").

A fully referenced current list of plants that have seeds with elaiosomes can be found in Lengyel et al.