Shangjuan, Ichang lemon
Ichang papeda, parent species
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Sapindales
Family: Rutaceae
Genus: Citrus
Species: C. ichangensis × C. maxima
Binomial name
Citrus ichangensis × Citrus maxima

The shangjuan, or Ichang lemon (Citrus ichangensis × C. maxima), is a cold-hardy citrus fruit and plant originating in East Asia.

According to some it is the best bet for cold-hardy citrus with edible fruit.[1] It is believed to be a hybrid of pomelo and Ichang papeda and thus may also be called Ichang pomelo.[2]


Shangjuan forms a shrub or small tree, which is commonly thorny. Leaves are notable for a large petiole, resembling those of the related Kaffir lime and Ichang papeda, and are fragrant. The large fruit has a flavor resembling a mixture of lemon and grapefruit, and is occasionally used as a substitute for those fruits. Like other citrus fruit with C. ichangensis ancestry, the shangjuan is relatively cold-tolerant.

The fruit looks a bit like a grapefruit, and can be either pale yellow or green depending on the degree of ripeness. Shangjuan fruits, which are very aromatic, can be as large as a grapefruit (up to 10 cm or larger).


  1. "The Best Cold Hardy Citrus? So far....".
  2. Jorma Koskinen and Sylvain Jousse. "Citrus Pages / Papedas".
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