Tolong jelaskan mengenai Kultivar penting termasuk: dari Pyrus pyrifolia dalam bahasa melayu

'Chojuro' (ja:長十郎, Jepun, 1893?) ('Pear russet')

'Kosui' (ja:幸水, Jepun, 1959; kultivar yang paling penting di Jepun), ('Pear russet')

'Hosui' (ja:豊水, Jepun, 1972) ('Pear russet')

'Imamuraaki' (ja:今村秋, Jepun, asli) ('Pear russet')

'Nijisseiki' (ja:二十世紀, Jepun, 1898; nama bermaksud "abad ke-20", juga dieja 'Nijusseiki') ('Pear hijau')

'Niitaka' (ja:新高, Jepun, 1927) ('Pear russet')

'Okusankichi' (ja:晩三吉, Jepun, asli) ('Pear russet')

'Shinko' (ja:新興, Jepun, pra-1941) ('Pear russet')

'Hwangkeum' (ko:황금, zh:黄金, Korea, 1984, 'Niitaka' x 'Nijisseiki')

'Huanghuali' (jangan dikelirukan dengan kayu Dalbergia odorifera, juga dipanggil Huanghuali)

Guidelines for the conduct of tests for distinctness, uniformity and stability - Japanese pear, The International Union for the Protection of New Varieties of Plants, 1994-11-04.

ニホンナシ育成品種の系統図 (Cultivar trees of Japanese pears) , National Institute of Fruit Tree Science, Japan

Shin Hiratsuka, Shao-Ling Zhang "Relationships between fruit set, pollen-tube growth, and S-RNase concentration in the self-incompatible Japanese pear" Scientia Horticulturae, 95 (4), 309-318 (2002).

Carlos Castillo, Takeshi Takasaki, Toshihiro Saito, Shigemi Norioka, Tetsu Nakanishi "Clonlng of the S8-RNase (S8 allele) of Japanese Pear (Pyrus pylifolla Nakai) " Plant Biotechnology, 19 (1), 1-6 (2002).