异常维管束是相对于正常维管束而言的,在不同的植物中,其异常维管束的有无、类型、存在部位、数目等是不同的,而同一种植物则是恒定的。这对植物分类特别是中药原植物的鉴定有很大的帮助。因为中药材往往只是植物体的某一部分,根本无法利用植物分类学依据直接进行鉴定。对于根? Abnormal vascular bundles are relative to normal vascular bundles. In different plants, the presence or absence, type, location, and number of abnormal vascular bundles are different, while the same plant is constant. This is of great help to the classification of plants, especially the identification of original Chinese herbs. Because Chinese herbal medicines are often only part of the plant body, they cannot be identified directly using plant taxonomy. For the root?