Assertion: yam's tuber | /r/HasProperty | important
Facets:
value: in africa
type: LOCATION
value: historically
type: TEMPORAL
value: in many tropical
type: LOCATION
value: for thousands of years
type: TEMPORAL
Source sentences:
text: Non-Dioscorea tubers that were historically important in Africa include Plectranthus rotundifolius (the Hausa potato) and Plectranthus esculentus (the Livingstone potato); these two tuber crops have now been largely displaced by the introduction of cassava.
text: Hearty and nourishing, roots and tubers have been important foods for thousands of years.
text: It produces a large root crop of edible subterranean tubers (yams) which are an important starchy food source in many tropical to sub-tropical areas around the globe.
text: Non-Dioscorea tubers that were historically important in Africa include Plectranthus rotundifolius (the Hausa potato) and Plectranthus esculentus (the Livingstone potato); these two tuber crops have now been largely displaced by the introduction of cassava.