- n Physostigma African woody vines: calabar beans
Century Dictionary and Cyclopedia
- n physostigma A genus of leguminous plants of the tribe Phaseoleæ and subtribe Euphaseoleæ, characterized by the spiral keel and by the continuation of the bearded style above the stigma into a large and oblique hollow hood. The only species, P. venenosum, is a high-twining vine of tropical Africa, with leaves of three large leaflets, and axillary pendulous racemes of purplish flowers, followed by long dark-brown compressed pods, each with two or three thick oblong highly poisonous seeds of valuable medicinal powers. See Calabar bean (under bean), chop-nut, eserine, and physostigmine.