Citrus ichangensis

Citrus ichangensis, the Ichang papeda (Chinese: 宜昌橙), is a slow-growing species of the Citrus subg. Papeda, which has characteristic lemon-scented foliage and flowers.
It is native to southwestern and west-central China and is likely named for the city of Yichang (宜昌), in China's Hubei province. It is sometimes referred to as Citrus × ichangensis.