Three diterpenoids, compound A (1), B(2) and C (3), have been isolated together with daucosterol (4) from the ethanol extract of Siegesbeckia glabrescens. Their chemical structures have been elucidated as ent-16β,17-dihydroxykauran-19-ocid (1), siegesbeckioside (2), darutoside (3),on the basis of chemical and spectral evidences. Compounds 1 and 2 are isolated for the first time from Siegesbeckia glebrescens.

The biotransformation of artemisinin by the hairy roots of Cyanotis arachnothea was investigated. After incubation for 8 days, the main product was determined as deoxyartemisinin.

Using highly degenerate primers by RT-PCR, the conserved region in GPAT-gene was obtained from total RNA of squash (Cucurbita moschata). In the PCR reactions, the coneen- tration ratio between the degenerate primers was essential for influencing amplification efficiency. Utilizing deoxyinosine(dI) can decrease degenerate degree and enhance the specificity of PCR products and amplification efficiency.

Forty-four pollen speciemens from thirty-four species and subspecies or varieties of the genus Epmedium (Berberidaceae) were examined by means of election microscope. The result revealed that the exine ornamentation evoled from irregularly-arranged stiate with small tips to foveolate, foveolateireticulate, and to reticulate or striato-reticulate type, along with the reticulate tectum from having small tips on it to psilate. Its taxonomic significance among them is discussed.

In this paper, the bioecological characteristics of 7 populations of Allium wallichii in Jizu Mountain were systmatically analyzed. There were diploid 2n= 2x= 14) and tetraploid (2n=4x=28) observed in the species Allium unllichii Kunth in Jizu Mountain. The habitats of diploid population are constant and barrener, which restricts the intrusion of tetraploid plants. No obvious differentiation existed between diploid population. Tetraploid populations' habitats are various, and the differentiation in niche, morphology and phenology between the population are significant. The diploid plants can't stand the shortage of light in forest, however, on the grassland and the rocks, the dwarf diploid plants have no capacity to compete with tetraploid plants and grass, so the diploid also couldn't intrude into the habitats of tetraploid plants. The dominant ecological factors causing population differentiation are light, soil and biotic factors. However,the water factor is the restricted factor which is the distributing underline of Allium wallichii in Jizu Mountain.

This paper analyses the karyotypes of 12 species of Magnolia in China. x= 19. M. offcinalis, M. theinalis subsp. biloba, M. sp., M. delavayi, M. amoena and M. coco of them are diploid species, 2n=2x= 38; M. liliflora, M. denudata and M. biondii are tetraploid species, 2n= 4x= 76; M. lotungensis, M. grandiflora and M. grandthera var. lanceolota are hexaploid spe- cies, 2n=6x=114. The polyploidy (secondary polyploidy) exists in Magnolia. The result of karyotype analysis showes that the karyotype differences among species in Magnolla are very small. Most of chromosomes are metacentric (m) A few of them are submetacentric (sm). The diploid species have only a pair of acrocentric chromosome (st). All of them are 2B type.

The Cupressaceae Bartling consists of about 115- 125(-150) species belonging to 20(22) genera, which widely distribute in the Northern and the Southern Hemispheres. To-date, the karyotypes of 55 representative species in 14 genera of the family have been made. The relative locations of the species' karyotype coordinate points, which are constructed from the measured data of chromosome by using the mean arm ratio and the chromosome ratio of the longest to the shortest of the complements as the abscissa (Y-axis) and the ordinate (X-axis) respectively, reflect their evolutionary trend and relationships (Fig.1 ). The coordinate points of the two hemispheres can be separated from each other by a straight line with only a few exceptions. Based on the karyotype data, a new cytotaxonomic system of Cupressaceae 6ncluding temporarily the genera having karyotypic data) is proposed as follows.

Aiming to determine antifeedant properties or repellent qualities of higher fungi against insects, 71 species of mushrooms and toadstools were screened using Spodeptera littoralis as a model insect. Reference tests were performed by offering an isolated larvae choising between a fungus-containing rearing medlium and a reference one. Among the 71 fungal species screened, 24 were fo und to show anti feeding or repellent properties as they were significantly rijected compared to the reference medium. A table of rejection of fungi by Spodetera ldtoralis is provided.

Survey was made on the VA mycorrhizal states of 256 pteridophtes species in the tropi- cal and subtropical areas of Yunnan. Twenty five species of VA mycorrhizal fungi were isolated and identified from the fern roots and rhizosphere soil of mycorrhized pteridophytes. The 25 spe- cies of fungi belong to the genera of Acaulospora, Gthespra, Glomus, Sclerocystis and Scutellospora respectly, among which, 8 species were new record of China. Concerning mycorrhizal states and their evolution of these pteridophytes was disussed, and the taxonomic characters of the 25 fungi species were described in this article.

The genus Schiffneria was published in 1894 by F.Stephani.It contains only a single species——Schiffneria hyalina Steph. which was only found in Taiwan,Fujian,Yunnan and Sichuan.Now it is newly recorded in Jiangxi Province.The characters of the gemetophyte and sporogonium of Schiffneria show that its relationship is close to Metezeriales belonging to a subfamily of Cephloziaceae.

The Camelllia ptlophylla germplasm resouce in Hunan rovince was evaluated. It con- tained specializational chemical ingredients in general tea. The tea polyphenol content (34% ~40% ) was more than the conventional level. The comprehensive results showed the wild tea germplasm resourse should have an important special value in tea breeding for black tea varieties a s well as used immediately in tea production.

The family of Pleuroziaceae of China, except some species, have not been studied com- pletely. In recent years, the authors collected and gathered the Chinese specimens of that family and found that there are five species of Pleuroziaceae in China. Among them, Pleurozia caledenica is newly recorded in China, as well, P.subitheta and P.gigantea are the first time to be found in Fujian and Zhejiang Provinces and Jiangxi Province seperately. The description of the family, key of the species and their figures are included in this paper.

Potentilla cristata Fletcher was described from a specimen collected in north Burma by R. Farrer in 1920 (Fletcher, 1950). The type specimen of P.cristata is deposited in the Herbarium of the Royal Botanic Gardens, Edinburgh (E). On the course of revising Chinese Potentilla, we found two sheets of P.cristata in the Herbarium of Kunming Institute of Botany, The Chinese Academy of Sciences (KUN ). In 1982, Qinghai-xizang Expedi- tion Team collected four sheets of Potentilla in the eastern slope of Mt. Gaoligongshan on Gongshan Xian, NW Yunnan at 3 500 m and 3 600 m above sea level (Qinghai-Xizang Exped. 8655). Within the four sheets,two sheets are P. cristata (8655a & b, Fig. 1) and the remaining two P. turfosa Hand.-Mazz. var. gracilescens Sojk (=P. gracillima T. T. Yu et C. L. Li) (8655 c). Potentilla cristata is new to China and we have not seen other specimens of this species than the type and these two sheets.

In the genus Amorgho phallus (Araceae) in China, 21 species are recognized. A. hirtus, A. henryi, A. mekongensis, A. stiopatus, A. coaetaneus, A. albus, A. yuloensis, A.oderatus and A. nanus are endemic to China. A key to Chinese species is provided in this paper.

Species R. xichouensi Yu et Lu affinis, sed plants sparse falcatoaculeata, paniculis terminalis densifloribus; bracteis linearo-lanceolatis integris vel a pice trilo bis differt.

Species affinis C. kunmingensi, sed foliis supra strigosis et villosis, margine irregulariter serratis,fructibus adultis aurantiacis, pubenscentibus differt.

Eleven species names and two variety names are reduced to new synonyms. Three new combinations and one new state are made. Two species are reported new to China. One new varie- ty is established. The delimitation of some species that are easily confused are clarified, and geo-graphical significance of some species is discussed.

So far about 72 species, 1 subspecies and 7 varieties had been validly published in Sect. Camellia. C. lienshanensis of Sect.Corallina and C. arinlngensis of Sect. Paracamellia were in- cluded in this section. Through study and revision, 12 species and 6 varieties were defined, others were reduced into relevant species and varieties as synonyms. Individual variation of species were discussed with the differentiation, distribution and natural hybridization.