Noun | 1. | ![]() rosid dicot genus - a genus of dicotyledonous plants family Saxifragaceae, Saxifragaceae, saxifrage family - a large and diverse family of evergreen or deciduous herbs; widely distributed in northern temperate and cold regions; sometimes includes genera of the family Hydrangeaceae golden saxifrage, golden spleen - any of various low aquatic herbs of the genus Chrysosplenium Chrysosplenium americanum, water carpet, water mat - aquatic herb with yellowish flowers; central and western United States |