bok choy

Reader's Digest 10月号の記事 '20 Foods Proven to Heal' からの引用です。

Broccoli sprouts have suforaphane, a cancer-fighting antioxidant that has also been found to be antimicrobial, antinflammatory, and neuroprotective; it may even protect against aging and diabetes. Broccoli, cauliflower, brussels sprouts, cabbage, and bok choy have it, too, but broccoli sprouts have the highest identified concentration--up to 100 times the amount as mature broccoli.
"bok choy" はどんな野菜でしょうか？
・Oxford English Dictionary: A Chinese cabbage of a variety with smooth-edged tapering leaves.: The bok choy takes about 45 to 50 days from seed to harvest.

・Collins Dictionary: a Chinese plant, Brassica chinensis, that is related to the cabbage and has edible stalks and leaves

Also called: Chinese cabbage, Chinese leaf, pak-choi cabbage

後者の辞書にはイメージが載っていたので "bok choy" はチンゲン菜だと分かります。