Three eudesmanoic acids (1~ 3) and two eudesmanoic acid glucosides (4-5) were isolated from the n-BuOH extract of the title plant.

The examination of the aerial parts of Eupotorium adenophorum Spreng resulted in the isolation of eigth compounds. They were identified by spectra analysis and included five flavonoids-quercetagetin 7-β-O-glucoside, 6-methoxykaempferol 7-methyl ether 3-β-O- glucoside, quercetagetin 4'-methy lether 7-β-O-glucoside, 6-hydroxykaempferol-7-β-O- glucoside and 6-methoxygenkwanin, one coumarin -umbelliferone; one new phenyl gluco side-3-(2'-β-O-pyranoglaucoside) -phenyl-2-trans-propenoic acid and dotriacontanol.

Four compounds were isolated and elucidated from the bark of Schima wallichii (DC) Korthals. On the basis of spectroscopic and chemical evidences, the structures of four com-pounds were established as 2-spinasterol (A), a spinasterol glycoside (B), epicatechin (C) and a new tritepenoid saponin (D). The structure of D evidences as 2-O-angelic acid ester-A1-barrigenol-3-O [α-L-rhamnopyransyl (l→ 2)] [β-D-glucopyranosyl (→ 2)-β-D-galacto-pyranosyl (l→4)]-β-D- glucuronopyranoside.

Three new 6,7-seco-ent-kaurane diterpenoids named epi-eriocalyxin A (2),maoecrystal N (3) and maoecrystal O (4) together with two known constituents eriocalyxin A (1) and maoecrystal L (5) were isolated from the dried leaves of Isodon eriocalyx. Meanwhile, the structure of eriocalyin A was revised.

The cold resistant CR-4 and homobrassinolide BR-120 were used by soaking seeds of rice and then spraying on the leaves at the diplophyllous stage, respectively. After chilling stress (2 ±1℃ ) in dark for two days, the root system of the rice seedlings was more flourishing, the dry weight of root was heavier and the root length was longer than the untreated control sample. The dry weight of stem plus leaf increased and the activities of superoxide dismutase (SOD) and peroxidase (POX), and the content of glutathine (GHS) increased notably. At chilling stress, the effect of scavenging activated oxygen in the variety with strong cold resistance was better. When the test samples regained room temperature for 1~ 5 days (25±1℃, 3000 1x, l2 h / d), the activi-ties of SOD and POX, and the content of GSH and ascorbic acid (ASA) in leaves of two varieties showing strong or weak cold resistance increased continuously. The content of molondialdehyde (MDA) (a product of lipid peroxidation of membrane) decreased. But in the period of regaining temperature, the effect of scavenging activated oxygen in the variety with weak cold resistance was better and the increases of activity of POX and content of GSH were more obvious.

As a preliminary contribution to the systematic study on the ecology of viable soil seed banks under different tropical forests in Xishuangbanna, the present paper examines the store and dominants of viable seeds in the soils of 10 cm depth in a seasonal rain forest charactered by Pometia tomentosa, Term inalia myriocarpo and three secondary forests respectively dominated by Macaranga denticulata, Trema orientalis and Mallotus peniculatus. The results display that Macaranga denticulata forest and Trema orientalis forest have the most abundant soil seed banks with the seed densities of 29 945 ±2 267 seeds / m2 and 24 740 ±2 275 seeds / m2(mean ±SE, n = 20), respectively. The seed density in the soil of seasonal rain forest is 5 905 ±202 seeds / m2,and Mallotus peniculatus forest is only 3 345 ±438 seeds / m2. Herb is the most dominant propor-tion in the composition of soil seed banks of these four forest types, which, however, is decreased as forest becomes older in the secondary succession.

This paper discusses species richness, evenness and species diversity of higher plants in deciduous broadleaved forests on the northern slope of Taibai Mountain. The results show that along the temperature and rainfall gradient, species diversity fluctuates greatly. The species diver-sity in the Quercus aliena var. acuteserata forest is the highest in six types of the forests. The spe-cies diversity index and evenness index for different strata is in the following order: shrub stratum > herb stratrum > tree stratum. As for the species richness, the order is herb stratum > shrub stratum > tree stratum. All of the five indices in shrub stratum are with very small variation among communities while those in tree stratum and herb stratum vary considerably.

Seventeen species in nine sections of genus Camellia were karyomorphologically studied. They share the round prochromosome type of the resting nuclei and the interstitial type of the prophase chromosomes in somatic cells. The karyotypes at mitotic metaphase given are listed as follows:1. 2n= 90= 62m(2sat)+22sm+6st for C. kweichowensis, 2. 2n= 30 = 23m(4sat)+5sm+ 2stfor C. semiserrata, and 3. 2n= 60= 32m(1sat) + 22sm+ 2sm(sat)+4st for C. xylocarpe in section Camellia. 4. 2n = 30= 23m+7sm for C. taliensis, 5. 2n = 30 = 20m+10sm for C. makuanica, 6. 2n =30 = 22m+ 6sm+ 2st for C porporea, and 7.2n = 30 = 21m+9sm for C. Ietracocca in section Tea. 8. 2n= 30= 2lm(lsat) + 7sm+ 2st forC. octopetala, etc.

Through the investigation, the authors find that the deformational ovuliferous-scale frequently occurs in the cultivated trees of Picea. The authors compare these deformed ovuliferous-scales, classify and arrange them into an aligment: a gradual transition from typical brief branch to normal ovuliferous-scale. On the typical brief branch-type ovuliferous-scale, there is an obvious axis, and several scales on the axis, and there is an ovule (or microsporange) on the outside of the scale. On the transitive ovuliferous-scale, the axis gradually reduces (but not disappears), shallow. The upper scales reduce to little or disappear, and the two lower side scales have gradually revolved about 90 °in the opposite direction. The retained scales are healed to normal as the scale or carp. The authors consider that the distortion perhaps is atavism. Perhaps these transitions reflect the developmental process of the ovuliferous-scale in history.

The pollen of 50 or so species representing 17 genera of Theaceae was examined by light microscope, scanning electron microscope and transmission electron microscope for the pufpose to elucidate the systematic relationshipes of the family. The examination indicates that the pollen grains are 3-colporate basically,suboblate to spheroidal and a few to subprolate in shape, with size from 13- 50 pm(polar axis) x l3~ 55 pm(equatorial axis). The pollen sculpture can be divided in-to rugulate, granulate, reticulate, foveolate, spinulate, verrucate and psilate types etc. The exine consists of tectum, columellae, foot layer and endexine.

Species habitu C. fragili (L.) Bernh. similis,differt pinnis oblongis, segmentis crenulatis,venulis tantum elongatis in incisuras, spinulis perisporarum longioribus plerumque 6~7 um longis.

Species affinis H. fumarioiditi (Dunn) Y. H. Zhang et H. W. Li, quae caule tenue, c. 20 cm alto, foliolis ovato-ellipticis margine 3(5)-dentatis praeditis, seminibus 2~3 (4) recedit.

This papaer has done carefully revision work on the three bigger genera, Manglietia,Magnolia and Michelia from the family Magnoliaceae.Five new combinations, eight new synonyms are reported.Moreover,two species and one subspecies are clearified here.

The first collection in Southern Sichuan of this fungus, mainly known over the insular margin of S.E.Asia and westem Pacific.

Based on a great deal of comparative morphological data(including root rhizome,stem leaf,tendril inflorescence,calyx,corolla,androecium,fruit,seed,and indumentum),an attempt is made to determine the evolutionary polarization of the characters and whereby to arrange the species systematically in Thladiantha.