Why do some overseas Chinese restaurants translate broccoli as "芥蘭"?
Apparently they categorise 芥蘭 and 西蘭花 as the same species… of different cultivar groups… although they do not at all taste in any way similar. For Chinese 芥蘭 and 西蘭花 are two completely different vegetables.

西蘭花 is broccoli, and I think it is okay to call 芥蘭 kailan.