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Résumé :
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As part of taxonomic studies of the family Polygonaceae for the Flora Zambesiaca project, two new species from southern tropical Africa are described: Persicaria nogueirae S. Ortiz & Paiva, from Zambia and Angola, and Oxygonum annuum S. Ortiz & Paiva, from Zambia. In addition, two new combinations are proposed: Polygonum glomeratum Dammer is transferred to the genus Persicaria as Persicaria glomerata (Dammer) S. Ortiz & Paiva, and Persicaria attenuata (R. Br.) Soják subsp. africana K.L. Wilson is renamed Persicaria madagascariensis (Meisn.) S. Ortiz & Paiva.
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