KnowraRubiaceaeLinked fromLinked fromThe 6 pages that link to Rubiaceae, each with the reason it gives.All 6Broader topic 1Narrower topic 3Compared with 2ApocynaceaeCompared with: It is another large Gentianales family, but its flowers and stipules distinguish it from Apocynaceae.CampanulaceaeCompared with: Its flowers can resemble bellflowers, but its opposite leaves and stipules mark a different lineage.