Table of Contents

18 January 2003, Volume 41 Issue 1
    Research Articles
  • WANG Wen-Tsai
    J Syst Evol. 2003, 41(1): 1-62.
    Clematis sect. Clematis is revised in this paper. Seventy-three species and 45 varieties are recognized. They are keyed, described, and illustrated in some cases, and are classified into five subsections. Brief taxonomic history and geographical distribution of the section are given, and the relationships of its subsections and with its close allies of the C. vitalba evolutionary stock of the subgenus Clematis are discussed. Main taxonomic changes are made as follows: (1) C. lancifolia Bur. & Franch., C. songarica Bunge, C. ispahanica Boiss., C. delavayi Franch. and C. phlebantha Williams, which have been previously regarded to be close to C. fruticosa Turcz. and its allies, and placed in sect. Fruticella Tamura by Tamura and some other authors, are here transferred to subsect. Angustifoliae Tamura according to the floral structure. (2) The existence of intermediate forms between the C. vitalba group and the C. flammula group indicates that these two groups are closely related to each other and should not be treated as two sections or even two subgenera. They are treated as two subsections within sect. Clematis . Two series, six species, and one variety are described as new, and five new ranks are made. 
  • ZHOU Zhong-Ze, ZHAO Zuo-Cheng, WANG Xu-Ying, XU Ren-Xin, LI Yu-Cheng
    J Syst Evol. 2003, 41(1): 63-78.
    Pollen morphology, and tepal and fruit microcharacteristics of the genus Fagopyrum Mill. (Polygonaceae) from China have been investigated. Pollen grains of ten species and one variety were observed under both light microscope (LM) and scanning electron microscope (SEM). They are prolate, or often subprolate/ prolate to spheroidal in shape, and elliptical from equatorial view, circular from polar view, with their germination aperture being all 3-colporate. Based on the presence or absence of colpus membrane, two types of pollen grains can be recognized in the species studied. In type I, the colpus membrane is visible, and often beset with coarse granules. Four species, F. dibotrys (D.Don) Hara, F esculentum Moench, F. tataricum (L.) Gaertn., and F. statice (Lévl. H. Gross, have this type of pollen grains. In type II, the colpus membrane is invisible. Six species and one variety, F. gracilipes (Hemsl.) Damm. ex Diels, F. leptopodum (Diels) Hedb., F. leptopodum var. grossii (Lévl.) Lauener et Ferguson, F. urophyllum (Bur. et Franch.) H. Gross, F. caudatum (Sam.) A. J. Li, F. gilesii (Hemsl.) Hedb., and F. lineare (Sam.) Harald., have this type of pollen grains. The exine ornamentation in all the species studied is finely reticulate. The exine is very thick. The sexine is thicker than the nexine. The columellae are high, usually branched, and rounded at top in cross-section. The tectum is semi-tectate. To further study the exine ultrastructure, pollen grains of F. esculentum were examined under transmission electron microscope (TEM). The exine is clearly stratified into ectexine and endexine and the ectexine possesses tectum and columellae, but no foot layer. Adaxial tepal surface of the ten species and one variety was observedunder SEM. Three tepal types are recognized based on the shape of epidermal cells and the surface ornamentation. In type I, the epidermal cells are mostly rectangular to narrowly rectangular, with the anticlinal walls being straight or slightly undulating, and the cuticularlayer being longitudinally and undulately striate. This tepal type is found to occur in F. statice and F. urophyllum. In type II, the epidermal cells are elongated and irregular in shape, and strongly ridged, with the anticlinal walls being deeply or shallowly undulating, and the cuticular layer being irregularly anundulately striate. This tepal type is found to occur in F. caudatum, F. lineare, F. gracilipes and F. gilesii. In type III, the epidermal cells are irregular in shape, and are papillose, with the anticlinal walls being straight and prominent, and the cuticular layer being densely and longitudinally striate. This type is found to occur in F. dibotrys, F. esculentum, F. tataricum and F. leptopodum. Fruit surface in the ten species and one variety was observed under SEM. Based on the surface ornamentation, the fruits can be divided into three types. In type I, the fruit surface is striate. This type is found to occur in F. statice, F. caudatum, F. gilesii and F. lineare. In type II, the fruit surface is warty granular, and sparsely striate among the granules. This type is found to occur in F. gracilipes, F. leptopodum, F. leptopodum var. grossii and F. urophyllum In type III, the fruit surface is rugosely striate or striate-reticulate. This type is found to occur in F. dibotrys, F. esculentum and F. tataricum. Evidence from pollen morphology supports the separation of Fagopyrum from Polygonum as an independent genus. Relationships of the Fagopyrum species studied are discussed based on evidence from polen morphology, and from tepal and fruit microcharacteristics. Brief speculation on the evolutionary trends of pollen, tepal and fruit microcharacteristics in the genus Fagopyrum is made.
  • CHEN Sing-Chi, LIU Zhong-Jian
    J Syst Evol. 2003, 41(1): 79-84.
    Four confused taxa of Cymbidium (Orchidaceae) are discussed taxonomically based on an examination of many living plants. As a result, Cymbidium tortisepalum Fukuyama and C. omeiense Y. S. Wu et S. C. Chen are recognized as separate species, C. longibracteatum Y. S. Wu et S. C. Chen as a variety of C. tortisepalum Fukuyama, and C. szechuanicum Y. S. Wu et S. C. Chen as a variety of C. cyperifolium Wall. ex Lindl. Due to the lose of the types and all the cited specimens of Cymbidium longibracteatum, C. omeiense and C. szechuanicum in PE over 30 years ago, their neotypes are here designated.
  • WANG Rui-Jiang, XING Fu-Wu
    J Syst Evol. 2003, 41(1): 85-88.
    Two new species of the genus Hedyotis L. (Rubiaceae) from southern China, H. wangii and H. yazhouensis, are described and illustrated.
  • CHEN Wen-Hong, SHUI Yu-Min, YANG Zhi-Guo, CHENG Xiao
    J Syst Evol. 2003, 41(1): 89-90.
    1CHEN Wen-Hong,1SHUI Yu-Min,2YANG Zhi-Guo,1CHENG Xiao 1(Kunming Institute of Botany, the Chinese Academy of Sciences, Kunming 650204, China) 2 (Hekou Forestry Bureau, Forestry Department of Yunnan Province, Hekou 661300, China) 2003,41(1).—89~90 Abstract:Two taxa of Stixis Lour., S.ovata(Korth.) Hall. f. ssp. fasciculata(King) Jacobs and S. scandens Lour., are reported as new records from China .
  • FU De-Zhi
    J Syst Evol. 2003, 41(1): 91-96.
    Some critical comments are made on the “Eight-Classs System” of the classification of angiosperms recently proposed by Wu et al., which the aut hors claimed to be a “polyphyletic-polytopic” system. This system is established based on the hypothesis that there have existed eight principal lineages of angiosperms by the end of the Early Cretaceous. However, this hypothesis has not been supported by any neobotanical and paleobotanical evidence. There lationship among the eight lineages and their relationship with the common ances tor of angiosperms are not clearly clarified in the system. Having failed to follow the principle of common ancestry in the reconstruction of angiosperm phylogeny and having misinterpreted the concepts of monophyly and polyphyly, the “Eight-Class System” of the classification of angiosperms is considered to be an artificial one.