Calabar bean

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Physostigma venenosum, the Calabar bean


It derives the first part of its taxonomic name from a curious beak-like appendage at the end of the stigma, in the centre of the flower; this appendage, though solid, was supposed to be hollow (hence the name from Ancient Greek φῦσα (phûsa), a bladder, and stigma).


Calabar bean (plural Calabar beans)

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  1. The seed of a tropical leguminous plant, Physostigma venenosum, poisonous to humans.