Sentence:  My absolute preference for a sweetener is the herb <WSD>stevia</WSD>—not the white crystalline extract, but the chopped green leaves. <WSD>Stevia</WSD> has no calories and does not cause any insulin response. 
Meaning of the word marked with <WSD> tags:  Any of the sweet herbs of genus "Stevia", native to tropical and subtropical regions of South America and western North America. (from 19th c.)