| Noun | 1. | genus Astilbe - chiefly Asiatic perennials: spirea 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 astilbe - any plant of the genus Astilbe having compound leaves and showy panicles of tiny colorful flowers |