White cabbage and Chinese cabbage maintain a lot in common: both maintain leaves that wrap tightly around each other to form a leafy head. Remarkably,however, these two crops originate from two different Brassica species used and domesticated by farmers on two different continents. In their publication in Nature Genetics, or scientists from Wageningen UR show how these two different Brassica species developed (were domesticated) in Europe and Asia,sometimes resulting in very similar crops.
Source: phys.org