Abstract: The traditional taxonomy of Angiospermae is mainly based on flowers. But the vegetative period of their life is much longer than the flowering period, especially in trees and shrubs. They always need many years to reach their flowering age. So vegetative organs can be used for classification.Based on the recent investigation, the author recognized that a vascular pattern is always stable for a family or a genus, and thus can be an importnat feature for the classification of trees and shrubs.?45 -the types of vascular structure visible oil trie cross section of young stems and petioles are described as follows:1. Cauline vascular bundle and its anomalous structure. Including pericyclic curdle (Plate I. 15-16), cortical vascular bundle (P:ate I. 17), mudullary bundleI late I. 18) and bicollateial vascular burdle (Plate I. 19-23) etc.2. Trace gap(1) Unilacunar ncde. Simple, two, three, or more traces from one gap. (Plate I. 1-8)(2) Trilacunar ncde. Simple trace from each gap, or more traces from each gap. more traces from median gap only. (Plate I. 9-12)(3) Multilacunar node. Many traces from equal number of gaps. (Plate I.13-14)3. Base bundle trace. The bundle traces evident in transverse section through the base of petiole.(1) Simple bundle trace. (Plate II. 1-6)(2) Two bundle traces. (Plate II. 7)(3) Three bundle traces. Including three simple and three groups (Plate II. 8-16)(4) Multiple bundle traces?Including regular simple (Plate II. 17 21), regular groups (Plate II. 22-23) and irregular traces. (Plate II. 24-26)4. Distal bundle traces. The bundle traces evident in tranverse section through the distal end of petioles.(1) Arc shape type. (Plate III. 1- 6)(2) Separate arc type. (Plate III. 7)(3) Closed siphonostele type. (Plate III. 8-10)(4) Separate siphonostele type. (Plate III. 11-12)(5) Flattened or concave cylindrical type. (Plate III. 13-16)(6) Separate flattened or concave cylindrical type. (Plate III. 17)(7) Arc with invaginated ends types. (Plate III. 18)(8) Open two rings type. (Plate III. 19)(9) Arc with separate strand type.