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It is a Meyers Lemon.......Citrus × meyeri, the Meyer lemon, is a citrus fruit native to China thought to be a cross between a true lemon and either a mandarin or common orange.

It was introduced to the United States in 1908 as S.P.I. #23028[1] by the agricultural explorer Frank Nicholas Meyer, an employee of the United States Department of Agriculture who collected a sample of the plant on a trip to China.[2]

The Meyer lemon is commonly grown in China in garden pots as an ornamental tree. It became popular as a food item in the United States after being rediscovered by chefs such as Alice Waters at Chez Panisse during the California Cuisine revolution at the end of the 1990s.[3][4] Popularity further climbed when Martha Stewart began featuring them in her recipes.[2]