Assertion: sweet potato's tuber | /r/HasProperty | plectranthus rotundifolius
Facets:
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.