Relationship Probability of Success Compatible Example Incompatible Example
Intraclonal piece of cake bridge graft (scion from same tree for repair of girdled trunk)  
Interclonal/ Intraspecific high Macinstosh apple (fruiting variety of Malus domestica) / EM 9 (rootstock clone of M. domestica) Red Maple cultivars (Acer rubrum*) / Red maple seedling (A. rubrum)
Interspecific/Intrageneric moderate

Sweet orange (Citrus sinensis) / Rough lemon (C. jambhiri)

Sweet cherry (Prunus avium) / Tart cherry (P. cerasus)

Almond (Prunus amygdalus) / Apricot (P. armeniaca)
Intergeneric/ Intrafamilial unlikely

'Old Home' pear (Pyrus communis)/ Quince (Cydonia oblonga)

Blue spruce (Picea pungens) / Norway spruce (Picea abies)

Bartlett pear (Pyrus communis 'Bartlett', Rosaceae family) / Quince (Cydonia oblonga, Rosaceae)

Lilac (Syringa vulgaris, Oleaceae family)/ California privet (Ligustrum ovalifolium, Oleaceae)**

Interfamilial no way!    

* varies with scion cultivar - 0 to 25% of clonal scions on A. rubrum develop delayed incompatibility

** delayed incompatibility - Nurse Root Graft

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