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.