Hi. 

Are different tree species graft-compatible if one of these classifications coincide ?  Or has to be an specific one ?  Or more than one ?  Or that is not it ?

 

Example:  Can Apricots and peaches be cross grafted because  both share a bunch of clades and more ?  If they coincide in only one of the clades; are they compatible ?   How is it known ?

Do you understand that those classifications are hierarchical?

All rosales are rosids
All prunus are rosaceae

And all of them are plants
 

You can definitely graft peaches on apricot trees or vice versa but peach trees are one of the harder trees to graft onto. In general, if trees are in the same genus, they are can be grafted to each other. 

(disclaimer; the only trees I have ever grafted are apples, chestnuts and maples and the latter two only for experimental purposes)

On 3/8/2024 at 2:08 AM, Externet said:

Are different tree species graft-compatible if one of these classifications coincide ?  Or has to be an specific one ?  Or more than one ?  Or that is not it ?

..there are even plants which you can cut a branch, put it in the water or soil, and it will sprouts roots.. I did it with e.g. chokeberry, gooseberry. If other plant will deliver the all required elements, it will work. It's all about nutrition.

 

On 3/8/2024 at 2:08 AM, Externet said:

 How is it known ?

Experimentation.