Arfeuillea is a monotypic genus in the family Sapindaceae with Arfeuillea arborescens as its only species. Commonly known as hop tree, this species is characterized by compound leaves arranged spirally around the branches, flowers with small white petals and larger red sepals, and dehiscent papery yellow fruits with two black seeds encased. It is native to Laos and Thailand but is cultivated only and not found in the wild. The species serves as a street tree across its native range and in Malaysia and Singapore, and its antioxidant-rich leaves are included in many Thai herbal medicines.