Not illegal. According to the relevant public information, betel nut has no monopoly provisions, and it is necessary to specify whether there is an agreement in the contract between the two parties. Violation of the agreement will constitute a breach of contract, but it is not illegal. Areca catechu (scientific name: ArecacatechuL. ) is an evergreen tree of monocotyledonous plants, primordia, Palmae and Areca. Its stem is erect and tree-shaped, and its height is over 10 meter, with the maximum of 30 meters. There are obvious annular leaf scars, monoecious, multi-branched, oblong ovary, oblong or ovoid fruit, oval seeds, and three flowering and fruiting periods.