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In page Rubiaceae:

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The family Rubiaceae is named after Rubia, a name used by Pliny the Elder in his Naturalis Historia for madder (Rubia tinctorum).[1] The roots of this plant have been used since ancient times to extract alizarin and purpurin, two red dyes used for coloring clothes. The name rubia is therefore derived from the Latin word ruber, meaning red. The well-known genus Rubus (blackberries and raspberries) is unrelated and belongs to Rosaceae, the rose family.[citation needed]