What is a small tree of the genus Citrus (C. Japonica) growing in China and Japan; also, its small acid, orange-colored fruit used for preserves called?

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kumquat — A small tree of the genus Citrus (C. Japonica) growing in China and Japan; also, its small acid, orange-colored fruit used for preserves. (Webster's 1913.)

What is a small tree of the genus Citrus (C. Japonica) growing in China and Japan; also, its small acid, orange-colored fruit used for preserves called?

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