The quince (Cydonia oblonga) is a flowering tree of the rose family which bears an edible golden fruit. Quinces are rare in America due to their susceptibility to fireblight disease (a bacterial infection caused by Erwinia amylovora). Because the fruit are unusual here and because, without cooking or other treatment, they are very sour and bitter, quinces are regarded as a sort of poor relation to apples and pears (both of which are indeed very close relations within the rose family), but probably it should be the other way around. Not only does the quince occupy an exalted place in literature and the arts, but the tree is believed to hold a treasure trove of medically useful compounds in its leaves, bark, and fruit.
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