The Bitter principles fron Swertia mileensis. T. N. He et W. L. shl. in yunnan were idetified as Sweroside. and yield were 0.8% (from whole dry herbs).

Diosgenin and Yamogehin were isolated and identified from the tubers of Discorea L. [D. parviflora Ting, D. panthaica Prain et Burk., D. coll-ettii Hook. f., D. collettii Hook. f. var. hypoglauca (Pa1ibin) Pei. et Ting ] in Yunnan. The results obtained are listed in the tables of this paper. The mixed sapogenins can obtain a better yield (48-56% ) to synthesize 3 βacetoxypregna-5, 16-dien-30-onet.

Five xanthone compounds have been isolated from the roots of Jin-Bu-Huan (Veratrilla baillonii Franch. Gentianqceae). On the basis oe spect -rometric analyses (UV. IR. NMR. MS.) and preparation of derivatives, the structure determination of the new compound is established as 1, 3 -dihydroxy -2, 7-dimethoxy xanthone(I), and the other four components were known as: 1- hydroxy- 2, 3, 7- trimethoxy xanthone (Ⅱ), 1- hydroxy -2, 3, 5- trimethoxy xanthone(Ⅲ), 1- hydroxy 2, 3, 4, 5- tetramethoxy xanthone (Ⅳ), 1, 4- dihydroxy- 2, 3, 7- trimethoxy xanthone(Ⅴ).

From the roots of Aconitum sinomontanum Nakai, a folk drug in Yunnan, three chemical collstituents were isolated. Two of their are C19-diterpenoid alkaloids and were determined as ranaconitine (1 ) and lappaconitine (2 ), respectively, other one as lycaconitic acid monomethyl ester (3 ) by the data of IR, H NMR, 13C NMR and MS.

Amomum villosum Lour. var. xanthioides (Wall. ex Bak.) T. L. Wu & J. chen and A. villosum Lour. are important. medicinal plants, the fruit may be used as a good medicinal material, though these plants are often fully covered with blossom, yet they bear only few fruits or even none at all. In the present paper the biological characters of flowering and fruiting of these species and their interrelationship with the surrounding are described.

The Shorea forest, which had been found in western Yunnan, is one of the tropical consociations in China. It distributes in shade-moist gutter below alt. 600m in Jie-Yang valley of Ying-Jiang county about N24°40', E97°34'. The annual mean temperature is more than 22℃ there, and The annual precipitation is over 2800mm.There are some essential characters in this community, such as, the tropical floristic components occupy 94%; the big trees of the upper layer are dominant by the Shorea assamica, which belongs to Dipterocarpaceae, and are mixid by Dipterocarpus pilosus, D.turbinatus, Taraktogeros kurzii Hydrocarpus alpine(Flacourtraceae) and Ficus glomerata var. chittagonga (Moraceae), Saraca griffithiana (Caesalpinaceae ), etc., their highness reach about 40ml the physiognomy appears evergreen; the species of lower layer are various, among them the individual numbers of Arenga pinnata(Palmae) are the most; the lianoid plants are abundant; there are also many plants possessing buttresses, cauliflorys, etc.

By the study about the territorial differentiation of Yunnan vegetation,the vegetation throughout Yunnan Province may be divided into 5 zones:1.The zone characterized by seasonal rain forest, semievergreen monsoon forest of the monsoonal tropic in north-border (Ⅰ Ai); 2.The zone characterized by monsoonal evergreen broad-leaf forest of the south-subtropical plateau (Ⅱ Ai); 3.The zone characterized by semi-humid evergreen broad-leaf forest of the north-subtropical plateau (Ⅱ Aii); 4.The zone charactefized by evergreen broad-leaf forest of the east plateau (middle subtropic) ( Ⅱ　Bi);5.The zone characterized by cold-temperate needle forest and meadow of the south-east Qinghai-xizang plateau ,Ⅲ Ai).

Species haec S. fortunei Vis. valde affinis, sed petalorum limbis bifidis,lobis apice inciso-dentatis, caulibus gracilibus, basi haud lignescentibus differt.Herba perennis, 30-60 cm alta. Radices crassiusculae. Caules laxe caespitosi, suberecti, graciles, glabri, basi haud lignescentes, supra medium viscosi.Folia basalia ad anthesin marcida; caulina oblanceolata, 5- 8 cm longa,5-10 (-12 ) mm lata, basi attenuata, apice acuminata, utrinque leviter scabra, glabra vel interdum in basin marginis ciliata, costa manifesta, superiora minora, ex axillis ramulos folistos steriles abbreviatos emittentia. Inflorescentia paniculata. Flores circ. 20(-25 ) mm diam.

Frutex 3-4 m. altus, cortice brunneus, atro-punctatus, cinereus glaber. Folia coriacea, oblonga vel oblopgo-lanceolata, 6.5-12 cm. longa,f 2.2-3.7 cm. lata,apice obtusa, interdum leviter emarginato vel mucronulata, basi cuneata vel obtusa margine revoluta, apice 1/3 sparse valde inconspicueque denticulata utraque 7-11-delltata, supra viridi, nitida, subtus pallidfore, minute papillbosa, costa supra impressa, subtus prominenti, nervis lateralibus 7 -11 -jugis, supra impressis, subtus leviter pfominentibus; petiolo 3 -7 mm. longo, superne excavato, glabrescentibus. Flores. xanthelli, 1.2 cm. diam., axillares solitarii vel terminales, pedicellis 1 -1.5 mm. longis vel subsessilibus, glabris, bracteola sepalaque 7- 9, inaequali subtotunda, imbricata gliabra, xanthella, 3-3.5 mm. longa et lata, subcoriacea, tenuiter marginata, petalis 6, late ovatis, 7 mm.

The genus Arisaema is one of the large genera of Araceae. At present 151 species have been recognised, of which 139 species or 92% have been collected from Asia, 6 from eastern Africa, 6 from eastern North America, but none have been found from Australia, Europe or from South America, This may serve as an indication of its Laurasian origin centering in Asia.

Haec in sectione Paurochaetio species sola in hemishaerio orientali cognita adhuc. Per ejus habitum annuum ex hemisphaerii occidentalis speciebus omnibus cognitis differt.Propter ejus spiculas glumas secundae lammatibus sterilibus in longitudine aequales habere,ut videtre speciebus Floridis,U.S.A.potius quam eis Cubanis aliquanto similis.

Tibet boasts of a rich and complex Pteridophyte flora, consisting of 44 families, 113 genera and about 470 species to date. They are concentrated in the south-eastern part and the southern flank of The Himalayas. Their distri-bution patterns frequently correspond to those of the forests in Tibet, as they are usually found in association with forests and other ligneous plants of various kinds, whose canopy may perhaps serve as an effective protection during the long winter season. However, their horizontal distribution is insignificant as they are nearly confined to a narrow belt including the south-eastern part of Tibet and the southern flank of the Himalayas.

There are 15 genera including 52 species of Anacardiaceae in China. They are distributed in those tributaris southern to Yangtze River basin especially in the south-western and southern part of China.Of the 15 Chinese genera, 9 belong to the Tropical Areal-Types, and 6 belong to the Temperate Areal-Types, altogether constituting 8 distribution patterns. By analyzing of these distribution patterns, it reveals from one side that Chinese Flora is widely connected with different floras of the whole world in their historical backgrounds. The flora of southern to southwestern China (especially in S. to S. E. Yunnan and S.Kwangsi) has the closest relationship with that of Tropical Asia (especially Indo-China peninsula), which may be probably the birthplace of the genera Pegia and Drimycarpus.

Meconopsis is larger genus in Papaveraceae. In this genus there are forty-nine specs all told. One species only is native to west Europe, while the other forty-eight species are all distributed in Sino.Himalayan Region of E. Asia. There are thirty-eight species in China.Special studies have been made by many botanists regarding the taxonomic system of this genus, Fedde's and Taylor's system are the representative one thereof.