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A calavance is any bean, especially the hyacinth bean, or any foodstuff made from these beans.
Bataw is a tagalog vegetable (Philippines). It is a bean pod. In English, it is known as lablab or hyacinth bean (lablab purpureus).
Dolichos lablab is the scientific name if hyacinth bean.
It is treated as a vegetable. Dry seeds are poisonous and can only be eaten after prolonged boiling
The scientific or taxonomic name would be Dolichos lablab (Lablab purpureus).