Which of the following is related to the east Asian Chaenomeles: Wulfenia or Pseudocydonia?
Wulfenia: Wulfenia is a plant genus in the family Plantaginaceae. Pseudocydonia:  It is closely related to the east Asian genus "Chaenomeles", and is sometimes placed in "Chaenomeles" as "C. sinensis", but notable differences are the lack of thorns, and that the flowers are produced singly, not in clusters.
i don't know