Table of Contents

18 April 1987, Volume 25 Issue 2
    Research Articles
  • Li Zhen-Yu
    J Syst Evol. 1987, 25(2): 81-92.
  • Ma Yi-Lun
    J Syst Evol. 1987, 25(2): 93-105.
    the comparative studies of morphology and anatomy of 19 species of Chinese Woodsiaceae are reported in the present paper. It includes anatomy of root, rhizome, rachis and joint on stipe; comparative morphology of the fronds and its parts, trichomes and indusia and an observation of the spores under SEM. The information is applied to discussing phylogeny and systematics briefly. The anatomical studies do provide taxonomic studies with evidence so that they should not be abandoned. For example, the stipe joints of Woodsia have two types, the stipe joint below the attachment point of the base pair of pinnae and the stipe joint just at the attachment point of that; the abscission layer of the former does not have pinna trace in it and the basic chromosome number is 39. However, the abscission layer of the latter does and the basic chromosome number is 41. It is obvious that the anatomical cha-racters can be used for infrageneric subdivision of Woodsia.
  • Wang Shan-Min
    J Syst Evol. 1987, 25(2): 105-105.
    A cytological study reveals the chromosome number of 2n=28 for Siraitia grosvenori (Swingle) C. Jeffrey ex Lu et Z. Y. Zhang from Yongfu County, Guangxi (fig. 1), which is different from the previous report of 2n=24 (Zou Qi-li et al. 1980). The voucher is deposited in the herbarium of Commission for Integrated Survey of Natural Resources,Academia Sinica.
  • Chen Yao-Dong
    J Syst Evol. 1987, 25(2): 106-113.
    The Baiyandian Lake lies at 115°56′ E. and 38°55′ N. It is about 8 m above sea level, with an area about 312 square km. There are abundant aquatic plants here, including flowering plants of 30 families, 46 genera, 66 species and 3 varieties besides one introduced species. 32 species are erect ones covering about 48.5% of the total number of species in this lake, 20 are submerged ones, about 30.3%, 9 are leaf-floating ones, about 13.6% and 5 are floating ones, 7.6%. The soil at the bed of the lake is very fertile and the depth is appropriate, favouring various plants. The coverage is large, sometimes it may reach 100%, for example, in communities of Phragmites communis, Hydrilla verticillata, Hydrocharis dubis, Trapa bicornis, etc. Although the Baiyandian Lake is located in the temperate zone, the floristic elements are complex. There are tropic-subtropic elements and elements of high-frigid zone as well. When compared respectively with the floras of the Lakes Jingbo Lake, Honghu Lake and Lugu Lake, the flora of this lake is found more similar to that of subtropic Honghu Lake than to those of the other lakes, which shows that it hase a character transitional between the south and the north in China. Further studies of the floristic relationships are needed in order to exploit and use the resources of the aquatic plants in this lake.
  • Zhao Shi-Dong
    J Syst Evol. 1987, 25(2): 114-124.
    The distribution of willows in China is studied in this paper. The origin of this genus and its distribution in the world are also discussed. There are 255 species of willows in China, taking up 46% of the total number of species of this genus in the world. They belong to 37 sections, which represent almost all forms. China is therefore the richest area in species and sections of willows in the world. This is mostly caused by the uplifting of Qinghai-Xizang (Tibet) plateau. The willows in China are mainly distributed in northwestern, northeastern and southwestern regions. The northwest is a part of central Asian flora. The northeast is a part of northeastern Asian flora. They both have some of the Europe-Siberia and Arctic-Alpine elements. Qinghai-Xizang plateau is another important distribution center of willows, which has no close relation with other floristic regions. As one of typical genera of the Holarctic flora, Salix has probably originated in the tropical mountains of Southeast Asia.
  • Xiang Qiu-Yun
    J Syst Evol. 1987, 25(2): 125-131.
    Cornus L. s. 1. is a large polytypic genus. The classificantion of which has been so different that some authors recognize several separate genera, while others treat them as either subgenera or sections. New evidence from many disciplines such as palynology, cytology, wood anatomy and embryology supports the view that the genus should remain in the broad sense. I basically agree with the treatment by Ferguson (1966b) before my finishing a comprehensive study on Cornus L. s. 1. except for supporting the separation of subgenus Afrocrania as an independent genus. A new subgenus Sinocornus Q. Y. Xiang, containing one species, C. chinensis Wangerin, is established here on account of its inflorescence axillary and different from the other members of the genus which all have terminal inflorescences only. The inflorescence developed from a terminal bud implicates the sympodial nature of axis of stem and the one from an axillary bud the monopodial one. It is reasonable to regard the character as of subgeneric value. Also a new combination, Cornus subgen. Syncarpea (Nakai) Q. Y. Xiang, is proposed here as a substitute for Cornus subgen. Benthamia (C. B. Clarke) Schneider used for a long time. Because the valid publication of the former name subgen. Syncarpea Nakai is earlier than the latter one. The types of inflorescences of 8 subgenera represented by type or selected species are illustrated.
  • Li Ping-Tao
    J Syst Evol. 1987, 25(2): 132-139.
    This paper is an outcome of taxonomic studies of Chinese Sauropus and Cleistanthus. The former consists of two sections and 14 species of which three species are new; the latter is of 6 species, of which 3 species are first recorded from China. These two genera are mainly distributed in southwestern and south China.
  • Tong Shao-Quan
    J Syst Evol. 1987, 25(2): 140-149.
  • Bao Shi-Ying
    J Syst Evol. 1987, 25(2): 150-159.