Green Stem Pak Choi (Brassica rapa var. chinensis)
 
Also known as:
green baby pak choy, Shanghai Chinese chard, Shanghai pak choy

Chun Mei, Hybrid #657		Chun Yu, Hybrid #666		Jimao Choi, Hybrid #661		Little Shanghai, Hybrid #660
Mei Qing Choi, Hybrid #121		Petite Star, Hybrid #449		San Fan, Hybrid #299		Shanghai #059
Summer Zest, Hybrid #658		Wa Wa Qing, Hybrid #659

Asian vegetable names...

China:  bok choy, Chinese kang choy, ging cai, pak choi, Shanghai choy sum, Shanghai pak tsoi, paak tsai, xiao bai cai, nai pe tsai, qing cai, tai koo choi, you cai, yu tsai

Indonesia:  pecai, pecal, petsai, petsay, samho, sesawi putih

Japan:  chingensai, tasai, tatsoi

Korea:  bok choy

Malaysia:  sawi, sawi puhit

Philippines:  pechay, petsay

Sri Lanka:  kala gowa

Thailand:  ang chaithao, pakk kwang toong, phakkaat farang, phakkaet bai

Vietnam:  cai be trang, cai ngot trang nho, cai thia, cai thuong hai, hach us