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Table 2 Estimated specificity numbers for Maloideae genera, under the assumption that the genera are about 5 million years old

From: Evolutionary patterns at the RNase based gametophytic self - incompatibility system in two divergent Rosaceae groups (Maloideae and Prunus)

Genus/Subfamily

Specificity number

Malus

17

Pyrus

27

Sorbus

16

Crataegus

7

Maloideae

35