Gum is extracted from

Cluster bean is the bean from which Gum is extracted.
Guar or cluster bean (C. tetragonoloba L.) is a drought-resistant leguminous crop that is generally cultivated in northwest India and Pakistan for use as a vegetable, green fodder and green manure and for its seeds, as well as for the industrial extraction of guar gum.
Guar gum with the best thickening power and fastest hydration rate is produced when the splits are first soaked in water and then flaked, extruded or ground.