Hi,

You can get the list of countries from the  IUCN Red list of threatened species..See the link attached below.

Based on this, you can generate your own distribution map by plotting in the world map ( free world data maps in shape file format is available from various sources )

http://www.iucnredlist.org/details/summary/172170/0

Hope this will give an idea .

Good luck.

Vijith H

Stan Hokarson of Cornell University et al. reviewed wild malus collections in http://hortsci.ashspublications.org/content/32/2/173.full.pdf+html Kezak and middle asia high planes are quite wide to get a single map