Main floristic symbols include snowball tree, willow, oak, poplar, periwinkle, marigold. The color periwinkle is also called lavender blue. Vinca alkaloids are amines produced by the hallucinogenic plant "Catharanthus roseus" (Madagascar Periwinkle). Lady Gaga described the dress as "periwinkle and sand," while David Duchovny called it teal. "Vinca" alkaloids are derived from the Madagascar periwinkle, "Catharanthus roseus" (formerly known as "Vinca rosea"). Specific botanical types include sunflowers, daisies, violets, carnations, periwinkle and lily-of the-valley. It is a vinca alkaloid that can be obtained from the Madagascar periwinkle "Catharanthus roseus". The Hodgkin's lymphoma chemotherapeutic drug vinblastine is derivable from the rosy periwinkle. The mound was composed of seashells, mainly periwinkle and limpet, and animal bones. With this change, the Angels' color scheme changed to dark blue and periwinkle. Professor Precilla Persimmon Periwinkle (portrayed by Millicent Martin) is Marnie's literature professor in Witch University. Shown in the right is the color periwinkle, or "periwinkle blue". The colour name periwinkle is derived from the flower. This is the case with periwinkle and ground ivy. Eli Lilly required lots of leaves of the periwinkle plant.