Adjective
Of or pertaining to a very large natural order of plants (Rubiaceae) 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.
Source: Webster's dictionaryAn intimate association between bacteria and plants is found in three rubiaceous genera (viz. Source: Internet
Endemic rubiaceous genera are found in most tropical and subtropical floristic regions of the world. Source: Internet
Woody rubiaceous shrubs constitute an important part of the understorey of low- and mid-altitude rainforests. Source: Internet