1. Plantae
  2. Tracheophyta
  3. Magnoliopsida
  4. Rosales
  5. Rosaceae
  6. Chaenomeles
  7. Chaenomeles speciosa

Chaenomeles speciosa 'Alba'

Probably 'Nivalis'.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Rosales
family       Rosaceae
genus        Chaenomeles Lindl.
species         Chaenomeles speciosa (Sw.) Nakai