1959 年 79 巻 10 号 p. 1310-1313
The secondary cortex of the crude drug Phellodendron appears in its cross-section, as shown in Fig. 1, as fine squares formed by the crossing of numerous fiber bundles and medullary rays. Each of these squares was examined by three kinds of ratio, called fiber ratio; i.e. number of thin-walled cells to number of fibers, number of mucilage cells to number of fibers, and number of crystal cells around the fiber bundle to number of fibers. Statistical examination of these ratios showed that domestic Phellodendrons cannot be distinguished by plant anatomy alone and that these ratios seemed to vary greatly according to habitat and by each individual. The cortex of Phellodendron from Southern area is suitable as the material for crude drug or for manufacture of berberine while that from the North would be suitable for preparing aqueous extract.