营养器官维管系统在树木分类上的应用

<正>一、前言 植物分类是一门古老的基础学科,它的产生、形成和发展,从本草分类、机械分类、自然分类直到今天的系统分类,经历了漫长的岁月,已经取得了很大的进步,形成了传统的分类理论。这个分类是以形态地理为基础的,在被子植物方面更是以花为分类的主要根据,理由是植物的生殖器官有着稳定的遗传性,它能够反映植物类群间的亲缘关系和系统发育规律,至今广泛应用,在分类学科中起着重大的作用。

AN INVESTIGATION ON THE CLASSIFICATION BASED ON THE VASCULAR PATTERNS OF VEGETATIVE ORGENS FOR CHINESE WOODY PLANTS

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.