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Choy sum (also spelled choi sum, choi sam or "cai xin" using Pinyin) is a leafy vegetable commonly used in Chinese cuisine. It is a member of the genus Brassica of the mustard family, Brassicaceae (Brassica rapa var. parachinensis or Brassica chinensis var. parachinensis). Choy sum is a transliteration of the Cantonese name (Chinese: 菜心), which can be literally translated as "heart of the vegetable". It is also known as Chinese flowering cabbage.