Around Analavelona Sacred Forest #Madagascar people collect and cook wild yams (Dioscorea sansibarensis) to supplement their diet.
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Just to confirm that these tubers are really from Dioscorea sansibarensis and are very poisonous. But here people remove poisons through a quite complicated process of removing a central core and then subjecting to cycles of soaking and drying.
@c_birkinshaw D villosa, not sansibarensis, surely? The latter is toxic!