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Polygonum posumbu Persicaria posumbu H.Gross, 1913 Persicaria posumbu Persicaria cespitosa Persicaria cespitosa (Blume) Nakai Persicaria caespitosa Polygonum cespitosum Blume Polygonum caespitosum Polygonum cespitosum Polygonum posumbu Buch.-Ham. ex D.Don |