derives from plant food product moreton bay chestnut food product https://en.wikipedia.org/wiki/Castanospermum Castanospermum australe (Moreton Bay Chestnut or Blackbean), the only species in the genus Castanospermum, is a flowering plant in the family Fabaceae. The seeds are poisonous, and can cause vomiting and diarrhoea, but become edible when carefully prepared by roasting, cutting up into small pieces, leaching with running water for several days, and pounding into flour and roasting it as a damper. moreton bay chestnut plant