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Oxalis shibeishanensis Huan C. Wang & Y. Tian (Oxalidaceae), belonging to O. subsect. Oxalis, is described and illustrated as a new species endemic to Yunnan, Southwest China. It is most similar to O. obtriangulata, but clearly differs from the latter by its 1.5-3 cm long, 3-9 cm wide leaflets with broadly cuneate base and not emarginate apex, 2-flowered inflorescences, narrowly ovate to broadly lanceolate sepals, and the petals being bifid at the apex. [ABSTRACT FROM AUTHOR]