Brassica oleracea var. italica
Western Broccoli.
西兰花/西蘭花 (Mand: xī lán huā; Cant: sai1 laan4 faa1)
Although not a "Chinese" vegetable, it is available in China. In fact, China is the world's largest producer. However, it is nowhere as popular as may be suggested by its use in western Chinese restaurants. That old favourite, beef and broccoli is rare here. A few years back a Dutch plumber decided to open a bar/restaurant in town. The only vegetable he ever served was over-cooked western broccoli. He didn't last long.
Usually stir-fried.
Not my favourite vegetable.