Rubiaceae
- Botanical characteristics of this family with illustrations and technical drawings of many species.
- http://delta-intkey.com/angio/www/rubiacea.htm

Rubiaceae (Coffee Family)
- A gallery of photographs of species in this family, photographed in Hawaii.
- http://www.hear.org/starr/hiplants/images/family/rubiaceae.htm

The Rubiaceae
- Information on this family of plants containing about 450 genera and 6,500 species, with photographs of some example species.
- http://www.botany.hawaii.edu/faculty/carr/rubi.htm