Begonia circularis, commonly known as the ringed begonia, is a species of flowering plant in the family Begoniaceae, native to Vietnam.
B. circularis is endemic to Thach An District, Cao Bang Province, Vietnam. It is found in the cracks of mossy rocks on partially shaded limestone cliffs in evergreen broad-leaved forest, elevation .
The specific epithet refers to the circular foliar variegation of the species.
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