Plants in the worldwide, but especially tropical Madder Family (Rubiaceae) are annual and perennial herbs, shrubs, trees, vines, and lianas with opposite or whorled, simple leaves, tubular or funnel-shaped flowers with usually 4 or 5 lobes and an inferior ovary, and fruit in the form of a capsule, berry, or a drupe.

Listed below are some of the southeastern Arizona plants in this family.