无量山种子植物区系的特有现象

地处滇中南的无量山地区迄今计有种子植物207科，1026属，2540种。其中有东亚特有科10个，中国特有属27个，无量山特有种67个。这一地区不仅植物种类丰富，而且特有现象较为显著。在对科级特有现象进行较细致的研究后，本文认为无量山具有的较多的分类系统上隔离的东亚特有科反映了该地作为东亚古老植物区系的一部分，其地质历史与整个东亚是一致的，且与东亚植物区系的发端密切相关。属的特有现象表明，地处中国特有属高频率中心区云南腹地的无量山，却没有相应的高比例中国特有，说明我国高频率区的特有程度质和量上不是均一的，在此之外存在一些次级中心区；无量山明显处于滇西北、滇东南两大中国特有属多样性中心之间。种的特有现象中，中国特有种的各亚型显示了这里区系的亚热带性质；67个特有种所隶属的属的分布区类型的分析表明了由热带性质向温带性质的过渡，而较低的特有种比例，说明无量山的地理隔离程度并不高，时间也不长。

THE CHEMICAL CONSTITUENTS OF ZINGIBER CORALLINUM BY SUPERCRITICAL CARBONDIOXIDE EXTRACTION

Seven compounds were isolated from the underground parts of Saussurea lappe in-cluding three steroids, pregnenolone (1), β-sitosterol (2), daucosterol (3); a phenylpropanoid glycoside, syringin (4); a lignan glycoside, l- hydroxypinoresinol-l-β- D- glucopyrano side (5); a straight chain fatty acid and an its propanedinyl ester, (z, z) -9, 12 -octadecadienoic acid (6), (z,z)- 9, 12 -octadecadienoic acid -2- hydroxy -1, 3 -propanedinyl ester (7). The structures of these compounds were determined by means of spectral and some chemical evidence. Moreover, among the seven compounds, compound 1 as a natural product has been isolated from plantS for the first time, compounds 3,4,5 and 7 have been obtained from this plant source for the first time.