Table 1. Differential classification of different Chinese cabbage varieties.

Numbering	Variety	Subclass
A	Italian lettuce	Rome lettuce
B	Purple Romaine lettuce	Rome lettuce
C	Butterhead lettuce	Looseleaf lettuce
D	Dong Fang Han Si-518 lettuce	Looseleaf lettuce
E	Purple leaf lettuce	Looseleaf lettuce