Table of Contents
  • Volume 45 Issue 5

      
    Research Articles
    SHEN Yun-Guang, WANG Zhong-Lang, GUAN Kai-Yun
    2007, 45 (5): 601-618.

    Cytological studies were carried out for 13 taxa in the genus Iris from China, of which three species, namely I. subdichotoma, I. delavayi and I. cuniculiformis were endemic to China. The chromosome numbers in somatic cells for each taxon were as follows: I. subdichotoma, 2n=42; I. japonica, 2n=34; I. wattii, 2n=30; I. laevigata, 2n=32; I. ruthenica var. nana, 2n=42; I. collettii, 2n=28; I. dolichosiphon and I. cuniculiformis, 2n=22; I. bulleyana, I. delavayi, I. chrysographes, I. forrestii, and I. lactea var. chinensis, 2n=40. The chromosome number and karyotype of I. cuniculiformis were reported here for the first time and its karyotype formula was 2n=22=4m+6sm+12st(2SAT). The karyotype of I. dolichosiphon was also firstly reported, whose karyotype formula was 2n=22=4m+12sm+6st. The chromosome number and karyotype of I. subdichotoma was newly observed, whose karyotype formula was 2n=42=20m+22sm. Three populations of I. ruthenica var. nana from different localities were investigated and all the three populations had the same chromosome numbers different than previously reported. The karyotype formulae for I. ruthenica var. nana were shown as follows: Zhongdian population, 2n=42=30m+12sm (2SAT); Lijiang population, 2n=42=28m+14sm(2SAT); Nixi population, 2n=42=36m+6sm (4SAT). In addition, the 2n chromosome numbers of three subgenera Limniris, Iris and Nepalensis in the genus Iris from present results and previous reports were summarized. The results showed that the chromosome number varied considerably in subgen. Nepalensis, in which I. subdichotoma was possibly a key species between the genus Pardanthopsis and subgen. Nepalensis. Chromosome number of I. ruthenica was reported as 2n=84 which was twice as much as its variety I. ruthenica var. nana (2n=42) we observed. By comparing with related groups, I. ruthenica is likely to derive from diploid group. Finally, variation of chromosome number and evolutional tendency of karyotype in the genus Iris were also discussed.

    XUE Heng-Gang, ZHOU Song-Dong, HE Xing-Jin, YU Yan
    2007, 45 (5): 619-626.
    In this paper, karyotypes from fifteen populations in thirteen species of Euphorbia (Euphorbiaceae) from China were investigated. The results were as follows: 2n=2x=22=20m (2SAT)+2sm for Euphorbia humifusa (Wangjiang, Sichuan); 2n=2x=22=18m+4sm for E. humifusa (Hongqicun, Beijing); 2n=4x=40=40m for E. thymifolia; 2n=4x=40=36m+4sm for E. maculata; 2n=8x=56=40m+8sm+8st for E. marginata; 2n=4x=40=32m+8sm for E. milii; 2n=6x=60=6m+36sm+12st+6t for E. neriifolia; 2n=6x=60=24m+24sm+12st for E. antiquorum; 2n=4x=28=24m(3SAT)+4sm for E. pulcherrima; 2n=4x=28=16m+12sm for E. cyathophora; 2n=4x=28=28m for E. dentata; 2n=2x=20=12m+8sm for E. lathyris; 2n=6x= 42=36m+6sm for E. helioscopia; 2n=2x=20=14m+6sm for E. esula (Chenjiagou, Beijing); 2n=4x=40=32m+8sm for E. esula (Yingtaogou, Beijing). The karyotypes of two species, E. thymifolia and E. maculata, and the tetraploidy karyotype of E. esula were reported for the first time.
    FANG Li-Qin, PAN Yue-Zhi, GONG Xun
    2007, 45 (5): 627-632.
    The monotypic genus Lamiophlomis (including only L. rotata) and five species of Phlomis in the Lamiaceae were karyomorphologically studied. The interphase nuclei are all categorized to be round prochromosome type, and the mitotic-prophase chromosomes are all categorized to be interstitial type. The karyotype formulae are as follows: L. rotata, 2n=2x= 22=18m+4sm; P. umbrosa, 2n=2x=22=22m; P. ruptilis, 2n=2x=22=22m; P. betonicoides, 2n=2x=22=22m; P. melanantha, 2n=2x=22=22m(2sat); P. strigosa, 2n=6x=66= 60m+ 6sm. The basic chromosome number of Lamiophlomis is confirmed to be x=11, the same as that of Phlomis sect. Phlomoides, which shows that Lamiophlomis rotata should be better treated as a species of Phlomis.
    LI Xin-Wei, LI Jian-Qiang, Djaja Djendoel SOEJART
    2007, 45 (5): 633-660.
    During the revision of the Actinidiaceae for the Flora of China, the treatments of a few taxa were changed and thus a number of synonyms are proposed. The necessary notes are provided.
    ZHAO Hong-Bo, CHEN Fa-Di, GUO Wei-Ming, MIAO Heng-Bin, LI Chang, FANG Wei-Min
    2007, 45 (5): 661-669.
    An intergeneric cross was made between Dendranthema×grandiflorum “Aoyunhuoju” and Ajania pacifica. Twenty two individuals were identified as an intergeneric hybrid according to the morphologies, cytogenetical characteristics and random amplification of polymorphic DNA (RAPD) molecular marker. Specific characteristics of A. pacifica, such as leaf color, were successfully integrated into the chrysanthemum cultivar, as were some less appealing morphological characteristics. Characteristics of the intergeneric hybrid, including leaf color, shape of leaf, color of flower, branching and blooming date, were intermediate between parents. However, the size, number, and shape of ray florets varied from individual to individual. Additionally, the chromosome number of the intergeneric hybrid was normal with an expected 2n=72; meiosis behavior overall was normal too. Cross compatibility indicated relative phylogenetic relationships between the parents to some extent. The intergeneric hybrid of D.×grandiflorum “Aoyunhuoju” and A. pacifica and its normal chromosome behavior, as a result of the relatively high cross compatibility, suggested a close relationship between the parents. We supposed that a close relationship between Dendrathema and Ajania.
    LU Jian-Zhong, WENG En-Sheng, WU Xiao-Wen, Ewald WEBER, ZHAO Bin, LI Bo
    2007, 45 (5): 670-674.
    The potential distribution of the invasive perennial Solidago canadensis in China was assessed by using the homoclime approach. This alien weed spreads rapidly in China, invading abandoned fields and disturbed habitats. It is currently abundant in four provinces of southeastern China, with scattered populations in other provinces to the West and North. We used a climatic profile from the native American range and matched it with data from climatic stations throughout China. To map the potential distribution in China, data were extrapolated to form a grid of 0.1 degree latitude by 0.1 degree longitude. Grid points that fall within the climatic profile are assumed to circumscribe the potential distribution. The potential range in China is remarkably larger than the current range, with parts of northeastern China appearing suitable for S. canadensis growth. The latitudes of the potential range span from 25° to 50°. The results show the considerable potential for future spread of S. canadensis in China, implying that control measures should be taken to contain this invasive species.
    LIN Yu, TAN Dun-Yan*
    2007, 45 (5): 675-685.
    Solanum rostratum Dunal. is an annual weed with strong ability for invasion. The species is native to the neotropics and southwestern United States, but it is now widely distributed throughout much of the world. In China, this species was first reported in Chaoyang County of Liaoning Province in 1982, and then successively reported in Baicheng City of Jilin Province, Zhangjiakou City of Hebei Province, and Miyun County of Beijing in recent years. In 2005–2007, this species was also found in Ürümqi County and Shihezi City of Xinjiang Autonomous Region. Solanum rostratum is an occasional weed in open disturbed sites such as roadsides, waste dump sites, and overgrazed pastures. It occurs in many soil types, especially in alkaline loam or clay mixtures under mesic conditions. Solanum rostratum exerts its influence on crops and pastures through competition for water, nutrients, and light throughout the growing season of the species. It is a nuisance because the sharp spines stick to skin, hair, and mucous membranes of livestock, and thus lower the quality of their skin and hair. Leaves, berries, and roots of S. rostratum contain cholinesterase inhibitory substances, which can cause livestock poisoning and even death. In addition, plant diseases and insect pests on the S. rostratum can also spread as the plant spreads. Based on a detailed review of the literature and our field observations in Xinjiang during 2005–2007, its invasion status and distribution in Ürümqi County and Shihezi City, morphological and reproductive characteristics, and potential harm of S. rostratum are summarized and analyzed in this paper. Our purpose is to provide background information for further studies of the invasion mechanism, reproductive and spreading characteristics, and the design of control strategies of S. rostratum in China.
    YI Tong-Pei, SHI Jun-Yi, MA Li-Sha
    2007, 45 (5): 686-692.
    Thamnocalamus unispiculatus Yi & J. Y. Shi, a new species of the Bambusoideae from southern Xizang, China, is described and illustrated. It is the first flowering and fruiting species of Thamnocalamus collected in China. It is distinguished from other species of Thamnocalamus by each spathe enclosing one spikelet and stigmas 2. The supplementary description of flowers and fruits of Fargesia grossa Yi was also given.
    YI Tong-Pei, SHI Jun-Yi, MA Li-Sha, YANG Lin, WANG Hai-Tao,
    2007, 45 (5): 693-695.
    A new species of the genus Indocalamus (Gramineae) from South Yunnan, China, I. jinpingensis Yi & J. Y. Shi, is described and illustrated. The new species is similar to I. victorialis Keng f. in habit, but differs by branch solitary at each node of culm, internodes solids or nearly solids, infranode densely covered with a ring of pale tomentum, not striped, intranode densely pale tomentose, culm-node very swollen on one side; culm-sheaths glabrous or sparsely brown adpressedly tuberculate hispidulous, pubescent at base; leaves 4–5 at ultimate branchlets, leaf-sheaths lossy when fresh, violet near apex, blades with 9–12 lateral veins on each side.
    WANG Rui-Jiang
    2007, 45 (5): 696-700.
    Hedyotis koiana R. J. Wang is described as a new species from Guangdong, Hunan, Jiangxi, Guangxi, Fujian, and Hainan provinces of China. It is most similar to H. herbacea L. and H. pinifolia Wall. ex G. Don. because they all have narrow leaves and their capsules are loculicidally dehiscent at the top, but it differs from H. herbacea by having termi- nal or upper axillary cyme and narrow leaves, and it can be distinguished from H. pinifolia by having long flowering pedicles, sparse inflorescence, and adaxially glabrous corolla.
    HE Kai-Jia, QIN De-Hai
    2007, 45 (5): 701-704.
    Strobilanthes pseudocollina K. J. He & D. H. Qin, a new species of Acanthaceae from Guangxi, China, is described and illustrated. It is similar to S. collina Nees, but differs by leaf blade coriaceous, inflorescence glabrous, with a few flowers sparsely arranged. Key words Strobilanthes, Strobilanthes pseudocollina K. J. He & D. H. Qin, Acanthaceae, new species, Guangxi, China.
    WANG Yi-Feng, LIAN Yong-Shan, DU Guo-Zhen
    2007, 45 (5): 705-707.
    Euphrasia brevilabris Y. F. Wang, Y. S. Lian & G. Z. Du, a new species of the Scrophulariaceae from Gannan grassland of Gansu belonging to the east edge of the Qinghai-Tibetan Plateau of China, is described and illustrated. It is related to E. regelii Wettst. by having dense tentacle on the leaves, bracts and calyces, but differs from plant shorter, 3–7 cm high, without ramification, leaves smaller, 3–5 mm long, corolla yellow, the back 3–5 mm long, and labium shorter than muffle. It is also similar to E. pectinata Ten. by bracts obviously bigger than vegetative leaves, but differs from plant shorter, leaves smaller, having dense tentacle on the leaves, bracts and calyces, corolla yellow, labium shorter than muffle.
    YU Sheng-Xiang, CHEN Yi-Lin, QIN Hai-Ning
    2007, 45 (5): 708-712.
    Impatiens macrovexilla Y. L. Chen var. yaoshanensis S. X. Yu, Y. L. Chen & H. N. Qin, a new variety of Balsaminaceae from Guangxi, China, is described. Variety yaoshanensis differs from the typical variety by having ovate-orbicular or ovate-oblong leaves, entire lateral sepals, an obvious auricle and entire distal lobe of the alae and visibly ridged seeds. Micromorphological characters of the pollen grains and seed surface under SEM of the two varieties also support the recognition of this taxon.
    ZHOU Zhong-Ze, SUN Qing-Ye, XU Wen-Bin, SHEN Jun, XU LI-Lin, ZHAO Xiu-Xia
    2007, 45 (5): 713-718.
    Polygonum jucundum var. rotundum Z. Z. Zhou & Q. Y. Sun, a new variety of Polygonum (Polygonaceae) from Shengjin Lake, southeastern Anhui, China, is described and illustrated. The variety differs from P. jucundum var. jucundum Meisn. by having leaf blade linear-lanceolate, 4.5–9.0×0.5–0.9 cm, base rounded, petiole nearly absent, and stems 1.5–2.0 mm in diam. The new variety is similar to P. longisetum var. rotundatum A. J. Li in leaf shape, but differs by plants taller, up to 160 cm, rooting at 20–26 base nodes, adventitious roots 10–16 cm long, pedicels longer than bracts, 4–5 mm long. The pollen morphology, tepal and fruit microcharacteristics of the new variety and its relatives were comparatively observed under the scanning electron microscope (SEM).
    FENG Jia, XIE Shu-Lian, YAO Ge
    2007, 45 (5): 719-726.
    Tuomeya Harvey (Tuomeya americana (Kützing) Papenfuss) is reported as new record to China. The specimens were collected from Xuzhou in Jiangsu, East China. This genus is characterized by a cartilaginous thallus and solid cortex, which is composed of numerous compact cortical cells. Its carpogonial branches are twisted. In addition to describing the morphological and reproductive structures of T. americana in detail, we also use rbcL gene sequences aligned with the previously published sequences of T. americana from North America. Tuomeya includes only one species, which was previously known from North America and South Africa.
    YU Gong-Liang, SONG Li-Rong, LI Ren-Hui
    2007, 45 (5): 727-741.
    Ten common species of Microcystis, based on the examination of water samples from the Dianchi Lake, Yunnan, China, were morphologically described, and their taxonomy was also discussed. They are Microcystis aeruginosa, M. botrys, M. firma, M. flos-aquae, M. ichthyoblabe, M. novacekii, M. pseudofilamentosa, M. smithii, M. viridis and M. wesenbergii. Taxonomic status of other Microcystis species reported in China was also evaluated.
    Key words Cyanophyta, Microcystis, morphology, taxonomy, China.
    ZUO Ben-Rong, CAO Tong, GUO Shui-Liang
    2007, 45 (5): 742-750.
    Three East-Asian species of the hepatic genus Scapania, namely, S. parvidens Steph., S. parvitexta Steph., and S. glaucoviridis Horik., which were recently treated as one species (S. parvidens) by Potemkin, are described and typified. Examination and comparison of the types as well as representative specimens showed that these three should be treated as separate species. Descriptions with figures for each species are presented and differences among the three species are discussed in detail.
    TIAN Huai-Zhen, XING Fu-Wu
    2007, 45 (5): 751-752.
    After observing the floral characters of living plants and herbarium specimens of Goodyera yangmeishanensis T. P. Lin, we found the variation range of those species covered that of G. shixingensis K. Y. Lang. Checking the holotype and isotype of G. shixingensis confirmed our observation. The name of G. shixingensis is thus reduced as a synonym of G. yangmeishanensis.
Editors-in-Chief
Song Ge
Jun Wen
Impact Factor
4.040
JCR 2018 IF ranking: 22/228 (Plant Sciences, top 9.4%, Q1 quartile)
Journal Abbreviation: J Syst Evol
ISSN: 1674-4918 (Print)
1759-6831 (Online)
CN: 11-5779/Q
Frequency: Bi-monthly

Sponsors

Publisher

Co-Sponsor

Scan to view the journal on your mobile
device
Scan to follow us on WeChat