Toxic Parts:
leaves, seeds
indolizidine alkaloids oxalates lectins saponins
Flower Color:
  • flower color
  • flower color
ornamental, gardens

Time of Greatest Risk


Geographical Distribution

Black bean tree distribution - United States

Related Species

Black Bean Tree

Castanospermum australe

Moreton Bay Chestnut, Garden Bean, Popping Bean, Kidney Bean, Pop Bean, Australian Chestnut
6/ 10
Black bean tree (Castanospermum australe) is a large evergreen tree often used as a shade tree or garden ornamental. Clusters of red and yellow pea-type flowers bloom in mid to late spring. The tree produces large cylindrical pods which contain large bean-type seeds. The nectar produced by the flowers attracts birds, bats and butterflies.

Toxic components
The leaves and seeds produced by C. australe contain saponins and castanospermine, an indolizidine alkaloid that is toxic to horses if ingested.