A new macrocyclic lactam which was named clausenlactam (1), together with known components zapoterin (2), myricetin-3-O-rhamnoside (3), ferulic acid (4), 7-hydroxycoumarin (5) and tnethylamine hydroiodide was isolated from Clausena exca.ata Burm. f. Its chemical structure was elucidated as 1, r-docosanedilactam by means of spectroscopic methods.

Three new sesquiterpenols, which were named as pterodondiol ,pterodontriol A and pterodontriol B, were isolated from Laggera pterodonta (DC.) Benth . Their structures were estab-lished to be 4β-dihydroxy-enantio-eudesmane, 2α,4β-trihydroxy-enantio-eudesmane and 1α,4β, 11-trihydroxy-enantio-eudesmane.

A new named infexusin(1) together with a known compound,kamebacetal A,were usilated from the leaves of Rabdosia inflexus (Thumb.)Kundo collected at Song county,Henan Province,and their were determined by spectroscopic analysis. Inflexusin is elucidated as ent-1β,6,11β,15α-tertraacetoxy-6,7-secopirolactone-kaur-16-ent(1).

Five flavonodis were isolated from the stem of Desmos chinensis Lour., of wich three were identified as desmethoxymatteucinol(II),negletein(III) and lawinal(IV) respectively.The structure of new dihydroflavone named cochinine A,was elucidated as 5-hydroxy-6-fromyl-7-methoxy-8-methyl dihydrflavone (I) by means of spectroscopic analysis.The chemotaxonomy feature of these flavonoids was also approached.

Hani people in Mengsong of Xishuangbanna, have been maintaining and using rattan resources sustainably for hundred years. This paper describes the communal rattan protected for-est "Sangpabawa", a traditional rattan resources management system created by Hani people and the practice of rattan cultivation in Hani swidden system. The Hani practice in maintaining rattan resource and its forest environment is undoubtedly significant to rational use and develop rattan resources in Yunnan tropics even in the world tropics. Some ethnobotanical information on rattan were also provided. Finally, authors discussed both technical and policy aspects related rattan management in the area.

Cultural shoots derived from adult and their seedings plant of C.scabrifolia were used as experimental material. Endogenous levels of IAA, ABA and Z+ZR were determined by methed of enzymelinked immunosorbend assay(ELISA). We also probed into relation among the plant hormones mentioned above and different rooting ratio in cultured shoots derived from seedings and adult plants of C.scabrifolia. The experimental results show: The endogenous level of IAA depends upon individual line. The balance of IAA and Z+ZR during the course from seeding to adult plant is multiform, when endogenous levels of IAA increase and Z+ZR decrease, it is of benefit to induce root in cultural shoots derived from abult plant. Conversely, it is dis-advanta-geous to induce root.The endogenous level of ABA in all shoots is at lower level, and no remark-able difference between the one derived from seedings or adult plant was observed.

In the present paper pollen grains of 8 species in the genus Dracaena (Liliaceae) from China were examined by scanning electron microscope, are reported here for the first time. As a result, four types of the pollen exine sculpture are distinguished: (1) foveolate, D. cochinchinensis and D. menglaensis; (2) regulate, D. cambodiana and D. terniflora; (3) reticulate, D. gracilis, D. angustifolia and D. ensifolia; (4) tuberculate-baculate, D. hokouensis. The differences in pollen morphology of Chinese Dracaena can serve as characters for delimitating species.

This paper examined pollen grains of Helicia Lour., Heliciopsis Sleum. and Grevillea R. Br. with LM, SEM and TEM. The result showed that the exine sculpture and the thickness of va-rious wall layers of Heliciopsis, on the one hand, are different from these of Helicia, the former with reticulate sculpture and thicker wall layers(tectum 0.5-0.7um, columellae 0.8-1 um, foot layer 1-1.5 um, the total exine 2.5-3 um), the latter with scabrate-granulate sculpture and thin-ner wall layers(tectum 0.3-0.4 um, columellae 0.15-0.2 um, foot layer 0.5-0.6 um, the total exine only 1-1.2 um), and on the other hand are similar to those of Sphalmium and Carnarvonia, both of which also have reticulate sculpture and thicker wall layers. Palynology supports Sleumer's view to separate Heliciopsia from Helicia.

Nothopanax davidii(Fr.)Harms ex Diels(Araliaceae)，a well known folk medicine“Liang Wang Cha”，is tall tree which grows in Guizhou province，China．The roots and steams are used to remedy rheumatosis and the injuries from falls,fractures, contusions and strains．From the alcohol extract of dried leaves of this plant，we isolated two triterpene glycosides,which gave a new triterpenoid named liangwanin A（l）

In the present paper, the somatic chromosome number and karyotype of the monotypic genus Theropogon (including the only species T. pallidus) in the tribe Convallarieae were investi-gated. The chromosome number in the root tip cells was counted to be 40, which is in accord with that reported by Kurosawa. The karyotype is given here for the first time and formulated as 2n=26m+12sm+2st(sat). The 9th pair of chromosomes have centromeres at the subterminal positons, with a satellite respectively on their short arms, and the satellites are longer than the short arms. The chromosomes decrease gradually in size from the largest to the smallest, so the karyotype is monomodal and belongs to Stebbins' 2B type. Compared with the other genera in the tribe Convallarieae, such as Convallaria, Reineckia, Rohdea, Tupistra and Aspidistra, Theropogon is different from them in its basic chromosome number, karyotype classification (especially from Speirantha, Aspidistra and those species of Tupistra with karyotype of 2C) as well as chromosome size, though its satellite chromosomes are similar to those of Speirantha, Rohdea, Tupistra a-ndAspidistra.

The somatic chromosome numbers of two species of Adoxaceae from north-east of China are reported in this paper. Adoxa orientalis Nepomn. (from Daxinganling Heilongjiang province)2n= 108; Adoxa moschatellina L. (from Antu Jilin province and Xifong Liaoning prov-ince)2n»36? Adffxa moschatellina L. (from Shangzi Heilongjiang province) 2n= 54. Among them, the chromosome numbers of Adoxa orientalis are reported for the frist time. It shows the maxi-mum number in Adoxaceae according to the data have reported before. Cytological evidens may not support that the Adwa orientalis is the primary group in Adoxaceae.

Species insiginis ab omnibus affinibus differi majore,pinnis lateralibus luribus,bpinnis infimis latioribus,pinnatis,stipite supra basin paleacea. 

Species nova S.falcatulo Besch.affinis,sed foliis caulinis latis，triangulo—lingulatis efibrosis，cellulis hyalinis leviter sepatis；foliis ramulinis ovatis vel oblongo—ovatis，apice plerumque apiculatis；porosis cellularum hyalinarum paucioribus tantum in angulis obsitis;cellulis chlorophylliferis in sectionibus transveralibus late triangulibus，dorso folii sitibus，facile differt．

Species proxime affinis C.wui Ching，differt fronde monomorpha major，lamina sagittata basi cordata plerumque utroque，squamis rilzomatis densioribus longioribus．

The Dipterocarp forest occuring in the south of Mengia County, Xishuangbanna, is a forest type of tropical rain forest from the northern margin of tropical zone of SE Asia. This for-est, covering about 800 hm2, is estimated to consist of 642 species of vascular plant belonging to 355 genera and 122 families, of which seed plants share 622 species of 340 genera of 109 families and ferns shares the others. In this forest, Rubiaceae with 54 species is the largest family in size and other families are arranged in sequance as following: Lauraceae(35 species), Euphorbiaceae(28), Annonaceae (28), Moraceae (25), Orchidaceae (23), Meliaceae (22), Vitaceae (15), Apocynaceae (13) and Fagaceae (12) etc.. Dipterocarpaceae, Guttiferae, Icacinaceae and Myristicaeae etc., though containing a few species separately, show higher importance value in-dex in this forest community.

The region of Hengduan mountain is a very natural region in floristic nature. Its seed plants' flora is abundant in species, genera and families, complex in geographical elements, strik-ing in endemism and vicariance, and basically temperate in nature. According to the degree of abundance in endemic species and some physiographical features, the region can be floristically divided into three subregions: subregion of NW Yunnan and SW Sichuan, subregion of NW Sichuan to SW Gansu and SE Qinghai, as well as subregion of E to SE Xizang. Based on the ana-lysis of its floristic elements, the region is certainly a knot for clarifying the questions about the relationships between the florogenesis and the plate-tectonics, about the origin of the North temperate flora including that of E Asia, N America and Europe.