Studies on the Development of Antihypertensive Agents from Korean Crude Drugs(I) -Morphological Comparisons of Korean and Chinese Barks of Eucommia ulmoides and of Euonymus japonicus in Korea and Euonymus pellucidifolia in Taiwan-

혈압강하제 국산 자원생약의 개발에 관한 연구(I) -한국산 두충과 원두충, 화두충과 대두충의 형태학적 비교-

Morphological characteristics of the Eucommia barks produced in Korea and China and of the barks of Euonymus japonicus $T_{HUMBERGI}$ in Korea and Euonymus pellucidifolia $H_{AGATA}$ in Taiwan were compared. The similarity in morphological features between Eucommiae Cortex produced in Korea and that of China suggests that both plants are of same botanical origin. However, the size of tissues and cells indicates that there is only one difference due to warm climatic environment. The similarity and difference of the barks of Euonymus japonicus produced in Korea and Euonymus pellucidifolia produced in Taiwan comfirmed that the two plants belong to the same genus and that they are different species.