Species Duvalia caespitosa × Piaranthus punctatus

For Henri Auguste Duval (1774–1814), French physician and botanist. He studied medicine at the University of Paris, was famous for his catalogue Plantae succulenta in horto Alenconio (1809) and was the author of Enumeratio plantarum succulentum in horto Alenconio. He was the first person to describe the plant genera Gasteria, Haworthia and Ligulari, and authored a book on all the species found naturally in the environs of Paris (1813).