On this Wikipedia the language links are at the top of the page across from the article title. The quince tree is also grown as an ornamental plant for its attractive pale pink blossoms and other ornamental qualities. The immature fruit is green with dense grey-white fine hair, most of which rubs off before maturity in late autumn when the fruit changes colour to yellow with hard, strongly perfumed flesh. The seeds contain nitriles, which are common in quince jelly recipe jamie oliver seeds of the rose family.

In the stomach, enzymes or stomach acid or both cause some of the nitriles to be hydrolysed and produce hydrogen cyanide, which is a volatile gas. Four other species previously included in the genus Cydonia are now treated in separate genera. These are Pseudocydonia sinensis and the three flowering quinces of eastern Asia in the genus Chaenomeles. Greek κυδώνιον μῆλον, kydonion melon “Kydonian apple”. Cydonia is included in the subfamily Amygdaloideae.