premise: Dovyalis is a genus of shrubs and small trees. Recent genetic evidence has shown the genus to belong to the family Salicaceae; formerly it was classified in the family Flacourtiaceae. The 15 species are native to Africa (Ethiopia south to South Africa) and southern Asia (India, Sri Lanka). Some are cultivated for their fruit.
hypothesis: There are 15 species of Dovyalis that are cultivated for their fruit.
reason: The context states that of the 15 species of Dovyalis, some are cultivated for their fruit.