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Structures of different organs of Bupleurum scorzonerifolium and the distribution law of secretory canals in different organs ANATOMICAL STUDIES ON THE SECRETORY CANALS OF FOUR GENUS OF ANACADIACEAE IN NORTHWEST CHINA Development and Histochemistry of the Secretory Canals in Bupleurum chinense Structures of Different Vegetative Organs of Peucedanum praeruptorum Dunn and the Distribution Law of Secretory Canals in Different Organs Relationship between Ultrastructure and Secretion of Secretory Canals in Root of Angelica dahurica