Single-genus groupings include apples, azaleas, boxwoods, dogwoods, hollies, magnolias and maples. The gardens exhibit a variety of flora including camellias, dogwoods, azaleas, and rhododendrons. They exhibit a variety of flora including camellias, dogwoods, azaleas, and rhododendrons. Host plants include maples, dogwoods, hawthorns, willows, elms, privet, black locust, and elder. Its peak bloom is in May, with the dogwoods, azaleas, lilacs, deutzia and crabapples. The outdoor living classroom of trees with historical significance cultivates flowering dogwoods, maples, and oaks. The club is famed for its azaleas and dogwoods. In 1934, the Morningside Civic League beautified the neighborhood by planting crepe myrtles and dogwoods. Swamps include willow thickets, red-osier dogwoods, spiraea, and other small shrubs. Along the south bank is the Rhododendron Garden, sheltered by Douglas firs and dogwoods. Dogwoods are valued by gardeners for their spring flowers, summer foliage, fruit and leaf color. The canyon is named for the flowering Dogwoods found throughout the escarpment. The walls are flanked by shrubs including "Buddleja", dogwoods, musk mallows, elder and mock-orange. In northern temperate areas, Cornaceae are well known from the dogwoods "Cornus". Cornus is a genus of woody plants in the family "Cornaceae", commonly known as dogwoods.