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    15 March 1984, Volume 4 Issue 1
    STUDIES ON THE GENUS RHODODENDRON L.(Ⅴ)
    Fang Wen-pei, Li Guang-zhao
    1984, 4(1):  1-8. 
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    NOTULAE DE GESNERIACEIS SINENSIBUS(Ⅴ)
    Wang Wen-tsai
    1984, 4(1):  9-35. 
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    MATERIAE AD FLORAM LATHYRORUM SINENSIUM
    Tsui Hung-pin
    1984, 4(1):  36-60. 
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    NEW TAXA OF SETARIINAE AND CENCHRINAE
    Chen Shou-liang, Sheng Guo-ying, Jin Yu-xing
    1984, 4(1):  61-72. 
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    A STUDY ON THE GENUS GENTIANA OF CHINA(Ⅱ)
    Ho Ting-nung
    1984, 4(1):  73-87. 
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    A REVISION OF JASMINUM IN CHINA
    Miao Bo-mao
    1984, 4(1):  88-111. 
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    Jasminum is by far the largest genus in the Oleaceac, which is composed of over 200 species, nearly a quarter of which is found in China. In China the genus grows mainly in south and southwest. The northern limit of its range extends to Lat. 35°30'N. , the vertical distribution from nearly sea level to 4000malt. About 90 species had been recorded in China, as a result of the latest review of chinese Jasminum, there remain 46 species, among which 2 new to China. Key to the genera of chinese Jasminum is provided in this paper. Also the taxonomy of the sections is discussed.
    KARYOTYPE ANALYSES IN LYCORIS RADIATA(L'HER.)HERB.AND VAR.PUMILA GERY
    Hsu Ping-sheng, Huang Shao-fu, Zhao Zhi-fen, Yu Zhi-zhou, Lin Jin-zhen
    1984, 4(1):  112-117. 
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    Karyotypic analyses for Lycoris radiata (L' Her. ) Herb. andvar. pumila Gery, cultivated in Hangchow Botanical Carden, were carried out. The chromosomes in root-tip cell of these plants were found to be 33 and 22 respectively, both exhibited asymmetrical karyotypes with rod-shaped chromosomes. According to the chromosomal terminology defined by Levan et al. [9], the karyotype formula of L. radiata is therefore K (3n) =33=15t+18st, and of var. pumila, K(2n)=22=22t. These results agree well with those reported by Inariyama [5, 6] and Bose and Flory [4], but differ very much with that of Mooker-jea [10]. The chromosomes of the diploid L. radiata var. pumila, which has smaller bulbs and narrower and shorter leaves than the triploid L. radiata, though quite similar in relative lengths, differ remarkably in absolute lengths and arm ratios with the triploid. L. radiata is undoubtedly a near relative of I. rosea Traub et Moldenke. Since both belonging to the Subgenus Lycoris, they are very similar in karyotype and in external morphology as well. In the light of the fact that trivalent chro-mosomes were formed in heterotype metaphase in the pollen mother cells of L. radiata, Inariyama [5] held that the triploid was of autopolyploid origin. But the parental tetraploid plants have not yet been found. If taking 11 to be the basic chromosome number and Ro-bertsonian fusion the major tendency of karyotype evolution in Lycoris as stressed by Inariyama [7], Stebbins [11] and Jones [8] in particular, L. radiata var. pumila should be considered as one of the most primitive taxa which may be ancestral in the karyotype evolution of that gentus. Photomicrographs, karyotypes and idiograms of L. radiata and var. pumila are shown in Figs. 1, 2 and 3. Measurements in microns of the chromosome sets are given in Tables 1 and 2. The vouchers are preserved in the herharium of Hangchow Botanical Garden.
    THE NEW SPECIES AND NAMES OF THE GENUS HOYA R.Br.(ASCLEPIADACEAE)
    Li Ping-tao
    1984, 4(1):  118-122. 
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    TAXA NOVA SALICAEARUM E CHINA BOREALI-ORIENTALI
    Fang Cheng-fu
    1984, 4(1):  123-127. 
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    A NEW SPECIES OF ATHYRIUM FROM N.E.CHINA
    Chien Jia-ju
    1984, 4(1):  128-129. 
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    THE CHARACTERISTICS OF HUNAN FLORA
    Qi Cheng-jin
    1984, 4(1):  130-145. 
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    Geologically Hunan province belongs to a part of SouthChina which has not been covered by the sea since the TriassicPeriod. As the sea receded a variety of land plants such as Bennettitales, Cycadales, Ginkgoales etc. began to appear. Therecent conifers and angiosperms originated and developed inthe Jurassic and Cretaceous periods. By the end of the Ter-tiary Perioe, the majority of Hunan flora had been established and were taxonomically similar to the recent flora; they seemed to have suffered no severy damage from the subsequent Quaternary ice. Thus, the genera and species number in Hunan are plentiful and complex, and a great number of relic, ancient, and primitive species have been conserved. Flowering plants and ferns in Hunan include about 244 families, 1089 genera (1200 genera including cultivated plants) and 4005 species, which represent 16% of China's plant species. Of these, more than 1900 species are woody plants, making up 25.3% of all woody species in China. Although many families are represented in Hunan, a high concentration of genera and species occurs in the following families: Taxaceae, Cephalotaxaceae, Taxodiaceae, Fagaceac, Lauraceae, Magnoliaceae, Theaceae, Hamamelidaceae, Flou-cortiaceae, Elaeocarpaceae, Styracaceae, Alangiaceae, Hydran-geaceae, Nyssaceae, Aceraceae, Aquifoiaceae, Corylaceae, Juglandaceac, Ulmaceae, Lardizabalaceae, etc. These families comprise the fundamental floral composition of Hunan province. Geographical elements (based on geographic distribution)are complex and varied; they may be divided into 13 types of regional distributions. The statistical data and results of these classifications are shown in this paper. Based upon our statistics and analysis, some fundamental characterisites of Hunan flora can be summarized as follows. 1) Floristic elements are complex and varied, originating from varied geographical elements (regional distributions). There are 13 geographical elements and these may be separated into three climatic types; the tropical distribution (481genera, 47.9% of total); the subtropical distribution (225 genera, 22.3% of total); and the temperate distribution (297genera, 29.7% of total). 2) The geomorphological transitions within Hunan province which occur from east to west and from south to north inChina are accompanied by transitional and convergent features of different floristic elements, especially between flora of EastChina and Central China, as well as between the flora of bothNorth and South China. 3) As stated above, the richness in relic and ancient types, as well as in monotypic and oligotypic types show that the floristic origin is ancient, perhaps representing Tertiary flora on the whole. 4) The flora are rich in endemic species of Asia, China, and East Asia-North America. These three compositions include 280 genera, making up 28% of the total flora of Hunan, and represent Ginkgo, Metasequoia, Cathaya, Eucommia, Bretschneidera, Davidia, etc. which are essential components of east asian flora. The relations of Hunan flora to the neighboring areas are described and discussed in this paper.
    A NEW VARIETY OF METASEQUOIA GLYPTOSTROBOIDES
    Long Yao-hwa, Wu Yue
    1984, 4(1):  146-152. 
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