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Genus of legumes

Castanospermum is a monotypic genus in the legume family Fabaceae. The sole species is Castanospermum australe, commonly known as Moreton Bay chestnut or black bean, which is native to rainforested areas on the east coast of Queensland and northeastern New South Wales, and to the southwest Pacific islands of Vanuatu and New Caledonia

The black bean is a large evergreen tree growing up to tall, though commonly much smaller. The leaves are long and broad, pinnate, with 11 15 leaflets. The flowers are bicoloured red and yellow, long, produced in racemes long. The fruit is a cylindrical pod long and diameter, the interior divided by a spongy substance into one to five cells, each of which contains a large chestnut like seed.

The 1889 book 'The Useful Native Plants of Australia' records the common names of Castanospermum australe as "Moreton Bay Chestnut" and "Bean tree" and notes that it was called "Irtalie" by Aboriginal people of the Richmond and Clarence Rivers (New South Wales) and "Bogum" by "others of Northern New South Wales". Other names that have been used by Aboriginal peoples are: baway, yiwurra, junggurraa, mirrayn, ganyjuu, and binyjaalga.

In 1981, castanospermine was isolated from the seeds. Members of this and closely related genera accumulate iminosugars in their leaves.

Due to its importance as a food, the blackbean tree was a seasonal gathering point for Aboriginal peoples, and this acted as a catalyst for ceremonies. Songlines featuring the black bean seeds have been collected. The bark fibre has been used for fish and animal traps, nets and baskets, and the empty seed pods have been used as toy boats. Additionally, the tree has been used as a seasonal signal for when to hunt jungle fowl.

The unprocessed seeds are poisonous since they contain toxic saponins, and can cause vomiting and diarrhoea, but they 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. The seeds have been prepared and eaten for at least 2,500 years. The 1889 book 'The Useful Native Plants of Australia' notes and describes this use of the beans. As of 2012, the food was not used in modern bush tucker, and there was no nutritional information available on the seeds.

The trees are popular as potted plants in Asia, Europe and America. In addition, they have been used as shade trees in landscaping for parks.

The wood was used by Aboriginal people for spear throwers. The timber, which somewhat resembles walnut, is soft, fine grained, and takes a good polish, and the wood has a durability rating above ground of over 40 years longevity.

Due to its significance as a food for Aboriginal people, blackbean trees were spread by hand into mountain areas on the east coast of Australia. All the trees in New South Wales are descended from a single seed. The plant naturally spreads by water. It has been introduced to India, Malaysia, Papua New Guinea, Sri Lanka, South Africa and the United States of America.