In a previous paper, we reported the variation of essential oil components comtained in a rhizome of Atractylodes lancea that is a botanical origin of Chinese crude drug"Cangzhu( ?? ?? )."In this paper, A. chinensis, an another botanical origin of this drug, was investigated in the same manner. The plant (179 individuals) growing wild was collected in Hebei, Shangdong and the North of Jiangsu provinces, China at flowering time. A. koreana that has been an origin of the drug was also obtained at the Shangdong peninsula. Six essential oil components, that is elemol (1), atractylon (2), hinesol (3), β-eudesmol (4), selina-4 (14), 7 (11)-dien-8-one (5) and atractylodin (6) contained in their rhizomes were determined with GC. Two types were recognized for a species A. chinensis according to the statistical analysis of essential oil components. One type is characterized by containing 3 and 4 as main components, and the plants belonging to this type are distributed in the North of the Huang-He river. Another type is characterized by containing 2 or 6 as main components, and the plants belonging to this type are distributed in the South of this river. Deposition of a white cotton like crystal was not observed from examined the plants. Compound 2 was detected in all the populations of A. chinensis including A. koreana. Especially, 6 was contained in all examined the plants. These results were compared with those of A. lancea.
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Takeda et al. (1995) studied this question.