Brunfelsia densifolia, Serpentine Hill rain tree, is a hardy, beautiful shrub endemic to Puerto Rico. It has simple, lanceolate leaves. Brunfelsia densifolia's yellow, tubular flowers are most prolific in the spring and summer, but occur to a lessor extent through the rest of the year. It produces orange fruit in the summer. It is native to dry areas with serpentine soil, which contains high amounts of magnesium, iron, nickel and chromium and little calcium and nitrogen. It thrives in South Florida landscapes with minimal care, growing in sun or part shade, preferring partial shade while young.