dark blue and white mid-century hybrid `delphinium` flowers

alpine arboretum bellamosum black bloom blossom blue blues botanical botany breed buttercup century colorful consolida dark dawn delphinium elatum flora flowers gallen garden garten giant grandiflorum hybrid hybridized larkspur meadow meadowland mid moody natural nature petals plant purple ranunculaceae ranunculales rittersporn saint spurrier summer swiss switzerland turquoise violet white