The Collaborative International Dictionary
Rubiaceous \Ru`bi*a"ceous\, a. [L. rubia madder, fr. rubeus red.] (Bot.) Of or pertaining to a very large natural order of plants ( Rubiace[ae]) named after the madder ( Rubia tinctoria), and including about three hundred and seventy genera and over four thousand species. Among them are the coffee tree, the trees yielding peruvian bark and quinine, the madder, the quaker ladies, and the trees bearing the edible fruits called genipap and Sierre Leone peach, besides many plants noted for the beauty or the fragrance of their blossoms.
Wiktionary
a. Of or pertaining to the large and diverse family of flowering plants known as Rubiaceae.
WordNet
Usage examples of "rubiaceous".
The bark of a rubiaceous plant (Palicourea densiflors), known as Coto, is employed in Brazil for rheumatism, but it is not known if this is the true Bolivian plant.