Bok choy or
pak choi (;
Brassica rapa subsp.
chinensis) is a type of
Chinese cabbage.
Chinensis varieties do not form heads; instead, they have smooth, dark green leaf blades forming a cluster reminiscent of
mustard or
celery.
Chinensis varieties are popular in
southern China and
Southeast Asia. Being
winter-hardy, they are increasingly grown in
Northern Europe. This group was originally classified as its own species under the name
Brassica chinensis by
Linnaeus.