From the dried leaves of I. eriocalyx, one new net-kaurane diterpenoid named maoecrystal P and a known compound coetsoidin A were isolated. They have been the only two ent-kaurane diterpenoids possessing α,β-unsaturated ketone functional group in ring B isolated from Isodon genus plants so far.

Three antitumor annonaceous acetogenins were isolated from stem of Goniothalamus cheliensis Hu by column chromotography on silica gel. One of them was identified as goniothalamin (1), and two of them were newly named as cheliensisin B (2) and cheliensisin C(3).

Two new diterpene alkaloids spiramine T and U, together with six known spiramine A, B, C, D, P and Q, were isolated from Spiraea japonica var. acuta Yu. Their chemical structures were elucidated by chemical and spectral means.

As a common pioneer species in the tropics, Trema orientalis dominates the early stage of secondary succession after slash and burn agriculture in Xishuangbanna. This study deals with the impact of slash and burn agriculture on soil seed bank of a 4-year Trema orientalis for-est.The results show that seed storage is significantly reduced from 65 355 seeds /m2 to 1 070 seeds/ m2 by slash-and-burn agriculture. There were 60 species in soil seed bank before slash-and-burn and 29 specise after that. Fire leads to an increase of burning-resistant seeds in the proportion in soil seed bank. The succession of forest is retarded by slash-and-burn agricul-ture.

The reproductive biology including population structure, sexual reproduction as well as vegetative propagation of Chloranthus holostagius has been observed and analysed in this paper. The result shows that in natural conditions, Chloranthus holostagius is mainly distributed on northern slopes of valleys with good every-green broad-leaved forests. The plant shows a kind of aggregated distribution pattern. The plant mainly processes sexual reproduction, and population regeneration is good. It takes about 3- 4 years from seed germination to sex mature. The matured individual has usually 1 terminal and sometimes 2 or 4 lateral spikes. In population, on an average, each individual can produce 1.91 spikes. Each spike has 28.07 disexual flowers. Chloranthus holostagius is allogamy and has a series of adaptable structures and morphologies. Its pollinator is Thropdae.

On different conditions, Stephania delavayi was infected by four kinds of Agrobacterium rhizogenes strains R1000, 15834, 1855, 8196, and hairy roots were induced by the strain R1000 in light from young plant tissues. In MS liquid medium, the growth of hairy roots tended to be stable after they had been cultured for 42 days. The content of isoquinoline alkaloid came up to the summit on the 28th day, which was 1104pg / gFW. Both growth and isoquinoline alkaloid content of hairy roots were very different in six kinds of media. Among different media, hairy roots grew fastest in Bs medium, and the content of isoquinoline alkaloids was the highest in Nitsch medium.Phenylalanine inhibited both biosynthesis of isoquinoline alkaloids and growth of the hairy roots in B5 medium.

The explants taken from young stems of Tax us yunnanensis produced calli on 6,7-V medium supplimented with 2,4-D, NAA and KT. The calli in this medium could differentiate buds. When young stems were transferred onto White medium containing IBA or IBA and 6-BA, they differentiated roots and formed regenerative plants. Those plants which were transplanted were easy to survive. This study provides a method of rapid propagation for Taxus yunnanensis.

This study put forward the approach of using monoploidy pollen(1n) as a reference to observe and test 2n pollen vitality of White populars by vivi-fertilization, and found the reasons of low rate of acquired triploids. The results showed that although 2n pollens had a certain germi-nating ability, the germinating process of natural and artificial 2n pollens was tardier than that of 1n pollens, and 2n pollens had weaker competition in mixed pollination than 1n ones. It was the radical reason of very low rate of acquired triploids in breeding practice. Moreover, the germi-nating of 20% to 35% of the 2n pollens induced by Colchicine showed innormalcy, which also af-fected the rate of acquired triploid breeding.

The C banding patterns of five taxa of Paeonia delavayi complex from Yunnan prov- ince in China were analyzed using a modified BSG technique. Each taxon (species or variety or form) examined had a unique C-banding pattern with some common features present in each taxon. All taxa examined were diploid with 2n= 10. Each taxon showed C-bands at the centromeric regions and no C-band at the long arms of all ten chromosomes. There were differ-ences in the C-banding numbers and positions at the terminal regions of the short arms. The aver-age ratio of C-band length to total chromosome length in each taxon was approximately 10% as found in P.delavayi. These results suggest that the five taxa of P.delavayi complex are closely re-lated and may have a common ancestor.

This paper studied the VA mycorrhiza of 10 Eusporangiate plants associated with the VA mycorrhiza fungi in their rhizospheres. It was found that 10 Eusporangiate plants were all mycorrhized with VA mycorrhizal fungi,and 9 species of VA mycorrhizal fungi were isolated from the rhizosphere soil of the 10 Eusporangiate plants. Among them, Glomus and Acaulospora were the dominant fungi. VA mycorrhiza may play an important role in the evolution of Eusporangiate plants.

The present paper deals with the karyotype analysis of three species in Cupressaceae in-cluding Calocedrus macrolepis var.formosana, Juniperus deppeana and Chamaecyperis formosensis.Their morphology of somatic chromosomes in root tip cells, chromosome parameters and dia-grams are shown is Plate 1, Table 1 and Figure 1, respectively. The karyotype fomulas of the spe-cies are K(2n)= 22= 22m(2SAT), 22m(2SAT) and 20m(2SAT)= 2sm, respectively. Their chromosome complements are 2n = 22 = 6M2+16Ml, 2L+6M2+14Ml and 4L+6M2+10Ml+2S ac-cording to the standard defined by Kuo et al. (1972) based on relative length. They belong to 1A and 2A type of Stebbins' karyotypic asymmetry. The karyotypes of the two former species are re-ported for the first time. Some related cytotaxonomic problems are also discussed in the paper.

In the leaf-falling period of Dalbergia odorifera, a tropical tree of legune, massive stor-age proteins were found in the central vacuoles of the parenchyma cells in the secondary phloem of the terminal branchlets. The formation and accumulation of the vacuole proteins was observed us-ing transmission electron microscopy. In the peripheral cytoplasm of the cells, there were plenty of free ribosomes and much rough endoplasmic reticulum (RER). Among the ribosomes, fibril-like materials always dispersed and the structures sometimes appeared which seemed to be the aggregations of the fibril-like materials and to be identical with the vacuole proteins on ultrastructural morphology.。

Accoding to its typical 4-merous flower, both terminal and lateral flower,Tetradoxa has been considered as the primitive genus in Adoxaceae. As a result, the long term contraversy about "invo1ucre-calyx" or "calyx-carolla" in Adoxa was settled here. According to this study, the rates of variation flowers in Adoxa moschatellina are much higher than the other 2 genera including 3 species in Adoxaceae. The rates of variant flowers in Adoxa moschatellina are 20% in terminal flowers and 36.1 % in lateral flowers. A reductive series by the reduction of poste-rior stamen and fusion of the adjacent carollamlobes from 6-merous to 3 merous of carolla and stamen exists in Adoxa only. The ancester form of Adoxaceae with both terminal and lateral flower is suggeted to be 2-merous. At Present, 3 genera including 4 species in the family seem to have been derived from the original 2-merous flower by multiplication (including diversity), reduction (in-cluding fusion) of the flower parts.

The Leigong Mountain nature reseve, Guizhou, is rich in macrofungi resources. The au-thor has collected more than 450 specimens of macrofungi in this area. The preliminary study shows that all of them can be divided into 38 families, 76 genera, and 205 species. In this paper, the author discusses the macrofungi of major vegetation types in this nature reserve. There are different macrofungi distributed in different forest types. A number of species of macrofungi decrease with altitudes and increase in different forest types. Different macrofungi can be divided into lower,middle and subalpine mountain types.

This paper reports 1 family (Adoxaceae) 2 genera (DysoPhylla, Adoxa), 12 species, l va-riety and l naturalize species as new records in Henan province. All these voucher specimens are preserved in the Herbarium, Henan Agricultural University (HNAC).

Occurring at the southern-most part of Yunnan province of China, the limestone flora of Xishuangbanna is a tropical one and belongs to the part from the northern margin of tropical Asian flora. In comparison with some regional floras from neighbouring areas, it is revealed that the limestone flora has closer affinity to tropical floras. It is also revealed that the similarity coefficient between tropical floras is almost not affected by limestone or non-limestone habitat, while the similarity coefficient between subtropical floras is more affected by limestone or non-limestone habitat. In the relationships with neighbouring floras, the limestone flora shows closer affinity to the floras of Indo-China, SE Yunnan, Guangxi, Hainan, Myanmar, Thailand and Malay Peninsula. It is concluded that the limestone flora of Xishuangbanna has the same ori-gin as the floras of tropical-subtropical Yunnan and Indo-China and is possiblly derived mainly from the "cathaysian flora" in south china but strongly affected by tropical Asian nora.

The present paper conducts cladistic analysis to evaluate the infrafamilial phylogenetic relationships of Magnoliaceae on an extensive literature review and study of the herbarium. In the cladistic analysis, the genus Uvaria of Annonaceae was chosen as an outgroup. The polarity of characters was determined mainly according to outgroup comparison, fossil evidence and general-ly accepted viewpoints of morphological evolution. Finally, a data matrix consisting of 31 termi-nal taxa and 27 characters was analyzed using PAUP 3.1.1 in Macintoch computer and Henning 86 in IBM computer, and 50 cladograms were generated, of which only the most parsimonious one was presented for discussion.

Based on the morphology, chromosome number and pollen morphological characters, a cladistic analysis is presented to reconstruct the phylogeny with respect to Moore (1968) for Caragana. About seventy two species in Caragana are recognized by the author and regarded as OTUs or terminal taxa. The results indicate that the infrageneric classification system could be treated as twelve series and five sections. Of them, Sect. Bracteolatae M. L. Zhang and Sect. Spinosae are erected and combined. Sect. Bracteolatae is treated mainly from Komarov's Ser. Bracteolatas. Sect. Spinosae includes Ser. Acanthophyllae Pojark., Ser. Spinosae Kom. and Ser. Dasphyllae Pojark. According to two evolutionary trends in Caragana, namely, the foliage from pinnate to palmate and the rachis from deciduous to persistent, Moore (1968) properly designed a two dimensional plan phylogenetic scheme of Caragana. In the present paper, Moore's phylogenetic scheme is modified in combination with the cladograms. Sect. Bracteolatae and series of Sect. Spinosae etc. are located in the suitable positions of the modified phylogenetic scheme.Ser. Chamlagu is classified into Sect. Frutescentes, so together with Ser. Frutescentes and Ser. Pygmaeae it forms a clade.