Table of Contents
  • Volume 31 Issue 2

      
      Research Articles
    • Hwang Shu-mei
      1993, 31 (2): 105–126
      Discussed in the present paper are evolutionary trends of important morphological characters of Deutzia, systematic position of several closely related genera, geographical distribution and characteristics of floristic elements. Finally the classificatory revison of the genus is made and a key to species is given. As a result, evolutionary trends of the important morphological characters in Deutzia are suggested; petals from imbricate to valvate, stamens from indefinite to definite, filaments from edentate to dentate, ovary from half-inferior to inferior. Therefore, the section Neodeutzia with valvate corolla and infinite stamens with edentate filaments should be included in this genus. The sections Neodeutzia and Mesodeutizia seem to be better considered as primitive taxa, while the section Deutzia advanced one. There are 52 species of Deutzia in China , which are grouped into two sections ( Sect. Mesodeutzia, Sect. Deutzia), four subsections (Subsect. Deutzia, Subsect. Grandiflorae, Subsect. Stenosepalae, Subsect. Cymosae)and 17 series. Sixty- five species are so far recognised in the genus Deutzia. They are mainly distributed in E. Asia and disjunctively in N. America. China is therefore an area the richest in species of Deutzia in the world, making up 80% of the total species of this genus. The greatest concentration area is in Sichuan (23 species), Yunnan (21 species), Hubei (12 species) and Shanxi (10 species), this is boundary area between Sino-Himalayan subregion and Sino-Japanese subregion, where occur abundant species (including 39 endemic species) and diverse taxa (2 section and 4 subsection). Based on these facts it is proposed that the present center of distribution and differentiation of Deutzia be in the southern part of the Hengduan Mountains, the Qingling Range and C. China.
    • Bao Bo-jian, Li An-jen
      1993, 31 (2): 127–139
      The genus Atraphaxis is found mainly in gravel steppes, sandhills and stony slopes or desert, with only a few species in meadow or river valleys. In China there are two sections and eleven species (including three varieties), which are distributed mainly in the northwest, with a few in the northeast and the north. Characters of the genus were compared and analyzed in the present work. Outer perianth segments 2, small, reflexed in fruit, inner perianth segments 2 or 3, large, erected and enveloping the nut. The embryo is curved, but those in the other genera of Atraphaxideae are straight. The curved embryo is the primitive character, because most species of the order Caryophyllales are of a circular embryo, which is belived to be ancestral in the Polygonaceae. The Pollen ornamentations of Atraphaxis are striate or striate-reticulate, different from those of the other genera. A new system of the tribe Atraphaxideae in proposed in the present paper. Based on the character analysis of the species in China, the present authors believe that Sect. Tragopyrum is more primitive than Sect. Atraphaxis. According to the distribution, the genus Atraphaxis might originate in Kazakstan, where not only are most species found, but also the most primitive species, like A. muchketovii, as considered by A. N. Krasnov, are found. Central Asia is considered as the distribution centre and origin centre of thegenus Atraphaxis.
    • Wang Jin-wu, Yang Ji, Li Mao-xue
      1993, 31 (2): 140–146
      Dendranthema indicum L. and D. lavandulifolium (Fisch. ex Trautv. ) Ling et Shih are two species which are greatly variable in morphology. The specimens collected from different habitats show distinct variation in characters such as leaf division、 leaf pubescence、 size of capitula and number of capitula. Some authors (Li 1983; Du 1989; Nakata 1987)have studied the chromosome numbers and karyotypes of D. indicum and D. lavandulifolium and reported the basic chromosome number and polyploidy of these two species. But some questions, such as the patterns and trends of morphological variation, the relationships between morphological and karyotypical variations and the phylogenetic relationship between D. indicum and D. lavandulifolium remain unclear . Based on wide field investigation and cultivation experiments, the present authors made a thorough study on D. indicum and D. lavandulifolium from morphology、 cytology with reference to geographical distribution and habit conditions. The results show that the amount of leaf pubescence of D. indicum is closely related to the water content in its habitat; the diameter of capitula decreases, while the number of capitula of D. lavandulifolium increases with the increase in elevation. Comparing the karyotypical constitution of different populations of D. indicum and D. lavandulifolium, the authors infer that natural hybridization, both intraspecific hybridization and hybridization between D. indicum and D. lavandulifolium, has played an important role in the origin of polyploids and in the evolutionary process of karyotypes of D. indicum and D. lavandulifolium. By a synthetic analysis from morphology, cytology and geography, the authors also suggest that D. indicum and D. lavandulifolium be sister species, derived from a common ancestor, and it is unreasonable to consider one of themevolved from the other.
    • Fang Yan-ming, Fan Ru-wen
      1993, 31 (2): 147–152
      Leaves of 25 species which cover 13 genera of the Chinese Hamamelidaceae (sensu lato ) were examined by light microscope (LM) and scanning electron microscope (SEM) to reveal the nature and variation of trichomes. The trichomes showed greater diversity under SEM than under LM and naked eyes. Based on Theobald’s scheme, they can be divided into four types: 1. Simple trichomes: Unbranched, curved or straight (Altingia, liquidambar, Semiliquidambar; 2. 2- 4 armed trichomes: Two to four branched (Corylopsis, Loropetalum, sinowilsonia); 3. Stellate trichomes: With more than five branches. They may be tufted (Forthunearia, Loropetalum, sinowilsonia, Hamamelis, Distylium) or storied (Eustigma); 4. Scales: Peltate and flattened. In the genus Rhodoleia, the scales are totally composed of small boat-shaped ones, whereas in the genus Sycopsis they are rotately branched on the verge but unbranched and flattened in the middle. The distribution of trichome types is of grest significance in hamamelidaceous phylogeny. The simple trichomes mainly exist in Liquidambaroideae and Exbucklandioideae, the stellate and 2-4 armed trichomes occur in Hamamelidoideae, and the scales are confined to Sycopsis (Hamamelidoideae) and Rhodoleia (Rhodoleioideae). From this fact, the authors consider that there are two evolutionary lines in the family, i. e. the Disanthoideae- Exbucklandioideae- Liquidambaroideae line and the Rhodoleioideae-Hamamelidoideae line though some subfamilies are isolated. Within Hamamelidoideae, the trichome types also have taxonomic significance. Corylopsis is a primitive group, whereas Eustigma, Distylium and Sycopsis are respectively on the top of evolutionary branches and the other genera are transitional groups. These genera might be separated as tribes, Corylopsideae, Eustigmateae, Distylieae, Sycopsideaeand Hamamelideae. The relationships among these tribes are given in Fig. l.
    • Di Wei-zhong, Ren Yi, Wang Guo-rui
      1993, 31 (2): 153–161
      The present study on pollen grains of the genus Viburnum Linn. Shows that: 1. The pollen characteristics are of no significance in division of sections, but each species has its own pollen characteristics. 2. The exine can be divided into three types: I. Exine semitectate, reticulate, muri psilate; II. Exine semitectate, reticulate, muri verrucate; III. Exine intectate, retipilate or pilate, the heads of pila verrucate. The evolutionary trend of the exine is III→II→I. 3. Four types of colpus margin are recognized: I. intectate; II. The colpus margin semitectate, reticulate; III. The colpus margin tectate; IV. Syncolpate at one pole, the margin tectate (only in V. farreri). 4. The ora can be divided into five types according to its membrane shape under SEM: I. The membrane of ora indistinct; II. The membrane of ora semispherical, discontinuous with colpus margin; III. The membrane of ora semispherical, continuous with colpus margin; IV. The membrane of ora semi-ellipsoidat, lolongate; V. The membrane of ora semi-ellipsoidal, lalongate, across the colpus like a bridge. 5. According to both pollen characters and inflorescence, the authors suggest that Sect. Pseudotinus be divided into two subsections, one including V. sympodiale, V. furcatum and V. latanoides, which have large sterile marginal flowers with the exine belonging to the Type I, and the other including only V. nervosum, which has no large sterr-ile marginal flowers with the exine belonging to the Type III.
    • Zhong Guang-yan, Ye Yin-min, Chen Zhu-sheng, Wu Yun-lun
      1993, 31 (2): 162–169
      The glutamate oxaloacetate transaminase isozymes (GOT) extracted from 125 biotypes of Citrus and its relatives, Fortunella, Poncirus and Microcitrus were analyzed using polyacrylamide gel electrophoresis to investigate the taxonomic relationships among citrus plants. Besides all the isozymes reported before, two new bands were detected and designated their putative alleles B and C in GOT-l. Among pummelo cultivars wide variations were found. Most of the mandarins were identical, having SS for GOI-1 and MM for GOT-2 except for Zou-Pi-Gan and Yao-Gan, which both had FS at GOT-1 and might be hybrids. This finding suggests that all of the mandarins may have originated from a common ancestor. Sour orange biotypes showed a considerable variation in GOT isozymes. Most of the sour oranges in China were assumed to be hybrids between pummelo and mandarin based on GOT isozyme patterns, but two biotypes, Xiao-Hong-Cheng and Zhu-lan, had FS at GOT-1 and MB at GOT-2, which strongly suggests that they be hybrids of pummelo and Ichang papeda because B allele of GOT-2 occurs only in Ichang papeda and its close relatives Yuzu and Ichang lemon. From this study Yuzu is assumed to be derived from hybridizationof Ichan, papeda and mandarin.
    • Wang Wen-tsai
      1993, 31 (2): 170–175
      Four new species of the genus Elatostema are described. They are E. coriaceifolium W. T. Wang, E. glochidioides W.T.Wang,E. liboense W.T.Wang,and E. baiseense W. T. Wang
    • Gu Zhe-ming, Cheng Ching-yung
      1993, 31 (2): 176–179
      In this paper,two new species of Euonymus are described from China. They are Euonymus jinfoshanensis Z. M. Gu and Euonymus xylocarpus C. Y.Cheng et Z. M. Gu. And the specific names of two species are revised.
    • Fang Ding, Yen Ke-chien, Zeng Ling
      1993, 31 (2): 180–183
      Two new species of the genus Aspidistra are described from Guangxi Zhuang Autonomous Region, China. They are Aspidistra cavicola D. Fang et K.C. Yen and A.marginella D. Fang et L. Zeng.
    • Wang Zheng-tao, Xu Guo-jun
      1993, 31 (2): 184–187
      Two new species of Codonopsis, namely C. parvitubulosa Z. T. Wanget G. J. Xu and C. retroserrata Z. T. Wang et G. J. Xu are described
    • Qiao Chuan-zhuo, Zhu You-ping, Su Zhong-wu, Li Cheng-hu
      1993, 31 (2): 188–191
      By comparing morphological characteristics of Armeniaca vulgaris Lam. and A. vulgaris var. ansu (Maxim.) Yu et Lϋ, A. vulgaris was found to have great variability and A. vulgaris var. ansu as identified in some herbaria was found to be a mixed group. Based on these observations, the circumscriptions of A. vulgaris and A. vulgaris var. ansu are revised and a new species, A.zhidanensis C. Z. Qiao et Y. P. Zhu, is described.
    • Ku Tsue-chih
      1993, 31 (2): 192–193
      In the present paper, a new species of Photinia (Rosaceae) P.zhijiangensis Ku is described from the Wuling Mountains, China.
    • Guo Bao-lin, Xiao Pei-gen
      1993, 31 (2): 194–196
      One new species and one new variety of the genus Epimedium (Berberidaceae) are described from China. They are E. enshiense B. L.Guo et Hsiao and E. platypetalum var. tenuis B. L. Guo et Hsiao.
    • Cheng Zhao-di, Gao Ya-hui
      1993, 31 (2): 197–200
      The planktonic diatoms from Xiamen Harbourare dominated by nano(<20μm)size fractions both for their species and cell number. Using TEM and SEM we found two new species: Cymatosira gibberula and Rocella marina, two genera newly recorded to China: Arcocellulus and Minutocellus, both in thesubfamily Cymatosiroideae of the family Cymatosiraceae and a new record to China: Skeletonoma menzelii.
Editors-in-Chief
Song Ge
Jun Wen
Impact Factor
2.779
JCR 2019 IF ranking: 56/234 (Plant Sciences, top 23.72%, Q1 quartile)
Journal Abbreviation: J Syst Evol
ISSN: 1674-4918 (Print)
1759-6831 (Online)
CN: 11-5779/Q
Frequency: Bi-monthly

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