Factsheet F10: Poncirus trifoliata
Poncirus trifoliata is closely related to the Citrus family, but unlike them is deciduous and hardy in temperate climates. It is native to Northern China and Korea; and common in Japan through cultivation. Its fruits look like small oranges or lemons, and are (despite gardening books alternative views) edible when suitably prepared. Common names include Trifoliate Orange, Bitter Orange, Hardy Orange, Japanese Bitter Orange, Japanese bitter lemon, Fuzzy lemon. Synonyms (only the first common) are Citrus trifoliata and Aegle sepiaria.