Synonym of kailan(“a long, blue-green vegetable with thick, glossy stems”)
[1992, Nancie McDermott, Real Thai: The Best of Thailand's Regional Cooking[1], San Fransico: Chronicle Books, →ISBN, page 55:
In Thailand, this dish [kwaytiow paht si-yu] is made with Chinese broccoli, called pahk ka-nah, a sturdy Asian leafy vegetable sometimes translated as Asian kale.]
2004, William Warren, At the Table of Jim Thompson, electronic edition, Singapore: Editions Didier Miller, published 2012, →ISBN, page 69:
Stir-Fried Rice Noodels with Asian Kale & Chicken (Gai Pat Sii Uuu) […] Add the Asian kale and noodles, and cook for 3 minutes.