It is most important to recognize the characteristics including cylindrical section of rhizome ( yuanlu ) , drooping adventitious root tuber ( xiachuiding ) , wirelike wrinkles on tap shoulder ( tiexianwen ) and some slender pliable warty fibrous roots ( zhenvuxu ) 、主根肩部的線形收縮紋(鐵線紋)及帶疣狀突起的細(xì)長(zhǎng)柔韌的須根系(珍珠須)是最重要的鑒別性狀。