What is a variety of Chinese cabbage used in stir-fry dishes and spring rolls?

Try Bok-Choi or Pak-Choi for the stir fry. Essentially any cabbage will do for this in any case. If the cabbage is a mature full grown specimen then remove the white ribs before chopping the green parts for the stir fry. The ribs can be cut up into one to two inch sections and steamed to form another dish served with a dressing of sesame oil and soy sauce. tasty and economical! Can't help with the spring rolls but Japanese mibuna and mizuna might be an idea.