Two new species of Saxifraga (Saxifragaceae) from Southwestern China

Two new species, Saxifraga xiaozhongdianensis J. T. Pan and S. ludingensis J. T. Pan, from the Saxifragaceae in China are described and illustrated. Of these, S. xiaozhongdianensis is endemic to Zhongdian, Yunnan, and is related to S. brachyphylla Franchet. It differs from S. brachyphylla in the sepals adaxially dark brown glandular-villose and the petals basally subauriculate. Saxifraga ludingensis occurs in Luding, Sichuan, and is very similar to S. egregioides J. T. Pan and S. stellariifolia Franchet. It differs from S. egregioides in the stems brown glandular-villose, the cauline leaves adaxially brown glandular-villose, the sepals spreading in anthesis and abaxially brown glandular-villose, and the petals 5-veined. It differs from S. stellariifolia in the leaves cordate and abaxially glabrous, the sepals abaxially brown glandular-villose, and the petals 4-callose and 5-veined. Saxifraga xiaozhongdianensis and S. ludingeasis are apparently endemic to western China and belong to Saxifraga sect. Ciliatae Haworth, emend. J. T. Pan.

New taxa, names, and combinations in Saxifraga (Saxifragaceae) for the Flora of China

The following new species, new variety, new name, and four new combinations are published for the forthcoming account of Saxifraga L. in the Flora of China, Volume 8: S. epiphylla Gornall & H. Ohba, sp. nov., S. gemmigera Engler var. gemmuligera (Engler) J. T. Pan & Gornall, comb. nov., S. heterotricha Marquand & Airy-Shaw var. anadena (H. Smith) J. T. Pan & Gornall, comb. et stat, nov., S. hypericoides Franchet var. aurantiascens (Engler & Irmscher) J. T. Pan & Gornall, comb. nov., S. hypericoides var. rockii (Mattfeld) J. T. Pan & Gornall, comb. et stat. nov., S. sinomontana J. T. Pan & Gornall, nom. nov., and S. sinomontana var. amabilis H. Smith ex J. T. Pan, var. nov. In addition, the names S. mengtzeana Engler & Irmscher and S. mengtzeana var. cordatifolia Engler & Irmscher are lectotypified here.

虎耳草属山羊臭组的界定和系统发育：核糖体DNA ITS序列证据

虎耳草属Saxifraga山羊臭组sect.Ciliatae是该属中最大的一个组，共有175种，主要分布在喜马拉雅地区，我国分布有166种，占总种数的95%；其中，112种为中国特有。约80%的种类分布在我国青藏高原和西南地区，是中国喜马拉雅植物成分的代表类群。山羊臭组内物种分化十分显著，分类处理也很困难，该组是否为单系类群，组下的系统发育关系也不清楚，均需进一步验证。本文测定了虎耳草属山羊臭组及其他组33种植物样品的核糖体DNA内转录间隔区ITS序列，并从GenBank调取虎耳草组sect.Saxifraga等组和近缘属唢呐草属Mitella共22种植物的该序列。ITS分析结果表明：（1）所研究的山羊臭组类群聚为单独一支，而且与垫状组sect.Porphyrion、虎耳草组、球茎组sect.Mesogyne和仅在欧洲分布的sect.Cymbalaria和sect.Cotylea等8个组聚成的另一分支构成姊妹群；（2）根据形态特征建立的山羊臭组的3个亚组即唐古拉亚组subsect.Hirculoideae、莲座状亚组subsect.Rosulares和具芽亚组subsect.Gemmiparae各自聚为一支，但是莲座状亚组这一支的支持率较低。同时，山羊臭组的鞭匐枝亚组subsect.Flagellares和subsect.Hemisphaericae的代表类群单独聚为一支，位于具芽亚组类群分支内部而不能成立；（3）唐古拉亚组和莲座状亚组又聚为一亚分支与具芽亚组构成姊妹群，而且具芽亚组最早从山羊臭组这一支中分化出来。我们的研究还发现山羊臭组内种间形态分化较大，而ITS碱基变异较小，这可能是山羊臭组类群在青藏高原及毗邻地区的高山环境下物种快速分化的结果。

新疆虎耳草属——-新变型

描述了虎耳草属-变型：白花挪威虎耳草（Saxifraga oppositifolia Linn.form.albiflora Y.H.Wu）.该变型系“昆仑山和喀喇昆仑山地区综合科学考察”工作期间于新疆策勒县的奴尔亚门采集到,与原变型的区别在于植物花冠为白色.

中国虎耳草属（虎耳草科）二新种——班玛虎耳草和丁青虎耳草

记载了中国虎耳草属Saxifraga新种，即班玛虎耳草S.banmaensisJ．T Pan和丁青虎耳草sdingqingensis J．T Pan。其中，班玛虎耳草仅见于青海班玛，与小伞虎耳草S．umbellulata Hook．f ＆ Thoms．近缘，但其萼片先端具软骨质短尖头，花瓣线形，非提琴状长圆形至提琴形，基部无爪，可资区别。丁青虎耳草见于西藏丁青，与近加拉虎耳草S．llonakhensis W W Smith相似，但其萼片3脉，于先端汇合成1疣点，花瓣具8痂体和4—5脉，基部截形或近耳形，可以区别。此两种均系中国特有种，隶属于莲座状亚组subsect．Rosulares Gornall。