Canavalia Maritima: African seed

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Canavalia Maritima is a tropical seed coming from a shrub.
It grows on the seafront in the sand in the area rarely flooded by the sea.
It is called pig vine,beach bean,pois bord de mer,pois sabre,baybean.
The color of the seed varies from light brown to dark brown.
It is resistant to seawater.
The shrub that gives us those beautiful seeds produces also pink to purplish flowers.
The leaves of some varieties are used for their psychotropic properties.