Chinese Flowering Cabbage (Brassica rapa var. parachinensis or Brassica chinensis var. parachinensis) is also referred to as a flowering pak choy or choy sum. Other names include tsoi sum and cai xin (Chinese), cai ngot (Vietnamese), pakauyai or pakaukeo (Thai), saishin (Japanese), Chinese soup green, white flowering cabbage and mosk pak choy (English).