Malus × zumi
Malus" × "zumi (or "Malus zumi") is a naturally occurring hybrid species of crabapple in the family Rosaceae, native to Japan, and a garden escapee in the US state of Ohio. Its parents are Manchurian crab apple "Malus mandshurica" and Siebold's crabapple "Malus sieboldii". It is used as a salttolerant rootstock for apples, "Malus domestica", as it can survive NaCl concentrations up to 0.6%. A number of ornamental cultivars are available, including 'Golden Hornet' and 'Professor Sprenger'.