bean plant moreton bay chestnut plant Castanospermum australe A.Cunn. & C.Fraser ex Hook. Castanospermum australe A. Cunn. & C. Fraser ex Hook. Castanospermum australe (Moreton Bay Chestnut or Blackbean), the only species in the genus *Castanospermum*, is a flowering plant in the family *Fabaceae*, native to the east coast of Australia in Queensland and New South Wales, and to the Pacific islands of Vanuatu, New Caledonia, and the island of New Britain (Papua New Guinea). Members of this genus accumulate iminosugars in their leaves.[https://en.wikipedia.org/wiki/Castanospermum] black turtle bean castanospermum australe requires discussion