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- Rubiaceae - Botanical characteristics of this family with illustrations and technical drawings of many species.
- Rubiaceae - The characteristics of the Bedstraw family which includes about 7000 species.
- The Rubiaceae - Information on this family of plants containing about 450 genera and 6,500 species, with photographs of some example species.
- Rubiaceae (Coffee Family) - A gallery of photographs of species in this family, photographed in Hawaii.
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