A monotypic genus of the witch-hazel family, from all other members of which it is distinguished by the combination of palmately veined leaves, flowers borne in pairs (hence the generic name), and fruits with several seeds in each cell.
From the Supplement (Vol. V)
The plants of D. cercidifolius in the Winkworth Arboretum, Surrey, mentioned at the end of the second paragraph on page 62, are dead. This species definitely needs shade, except perhaps in the rainiest parts of the country.