Some more familiar items. First:
Brassica oleracea (Gongylodes Group)
Kholrabi.
芥兰头/芥蘭頭 (Mand: jiè lán tóu; Cant: gaai3 laan4*2 tau4) or 苤蓝/苤藍 (Mand: pǐ lán)
This is mainly sliced thinly and used in hot pots, where it is valued for retaining its crisp texture. It is also cut into batons and stir fried. And it's pickled.