Rubiaceae

Rubiaceae is a family of flowering plants, variously called the madder, bedstraw, or coffee family. There are about 600 genera and more than 10,000 species in Rubiaceae. 

There are three subfamilies: Rubioideae, Cinchonoideae and Ixoroideae.

 References and other websites 

 Rubiaceae , Henriquezaceae , Dialypetalanthaceae  Theligonaceae  and Naucleaceae  in L. Watson and M.J. Dallwitz (1992 onwards). The families of flowering plants: descriptions, illustrations, identification, information retrieval.  http://delta-intkey.com 
 MOBOT Rubiaceae