Abstract: Some leaves of 6 species and 4 varieties from Brassica L. are studied on flavonoides in the thin-layer chromatography. All leaves are collected from the plants with the same ecologic environment, cultivated condition and growth period. They are divided into 3 type saccording to the chromagrophy. We have views in common with taxonomy that the plants of Brassica L. are divided into wild cabbage-type, Peking cabbage-type and Leaf Mustard-type. The observation from cultivating and the cytology data lead to the taxonomic study of Brassica L.

Key words: Brassica L., flavonoides, thin-layer chromatography, taxonomy