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In page Acacia mearnsii:

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Belgian naturalist Émile Auguste Joseph De Wildeman described the black wattle in 1925.[1] The species is named after American naturalist Edgar Alexander Mearns, who collected the type from a cultivated specimen in East Africa.[2] Along with other bipinnate wattles, it is classified in the section Botrycephalae within the subgenus Phyllodineae in the genus Acacia. An analysis of genomic and chloroplast DNA along with morphological characters found that the section is polyphyletic, though the close relationships of many species were unable to be resolved. Acacia mearnsii appears to be most closely related to A. dealbata, A. nanodealbata and A. baileyana.[3]