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→Classification
The pomological classification recognizes four groups:
=== PCA Group (Pollination constant astringent) ===
The fruit pulp is not influenced by pollination. The fruit is unedible when harvested, and must become mushy to be traded and eaten, which makes them difficiult it difficult to handle. Known cultivars are 'Costata' and 'Lycopersicon' in Italy, and 'Hachiya' (conical), 'Tamopan' and 'Tane-nashi' (spherical) in California.
=== PCNA Group (Pollination constant non astringent) ===
The fruit is not astringent (even if seedless), and can be eaten when still crisp, as an apple. Israel sells them it as 'Sharon fruit', and they are it is known in French as kaki-pomme. A common cultivar is 'Fuyu' ou 'Fuyugaki'.
=== PVA Group (Pollination variable astringent) ===