中国云南秋海棠属(秋海棠科)一新种——假侧膜秋海棠

描述了中国云南秋海棠科Begoniaceae秋海棠属Begonia扁果组sect．Platycentrum的一新种——假侧膜秋海棠Begonia coelocentroides Y.M．Shui＆Z．D．Wei。该种与山地秋海棠B．oreodoxa Chun＆F．Chun相似,子房上部为侧膜胎座,但雌花被片5,蒴果最大翅舌形,长20-22mm,而易于区别。     

云南秋海棠属新分类群

记述云南产秋海棠属９个新种。即;麻栗坡秋海棠,古林箐秋海棠,圆叶秋海棠,圭山秋海棠,大围山峰为海棠,马关秋海棠,红斑秋海棠,紫叶秋海棠,河口秋海棠。     

中国秋海棠属新植物

1 黄连山秋海棠 新种 图1 Begonia coptidi-montana C. Y. Wu, sp. nov. (Sect. Alaecida C. B. Clarke) Species B. taiwanianae Hayata arctissime affinis, sed foliis minoribus remote levis-simeque denticulatis, capsularum alis variabilibus differt. Herba perennis. Rhizoma breve, crassum, atro-rubrum. Caulis 0. 7—1. 2 m altus, ro-bustus, atro-ruber, longitudinaliter angulatus, glaber. Folia alterna vel 2 ad ramum brevem     

中国秋海棠属等翅组植物订正

根据海南秋海棠 (BegoniahainanensisChunetF .Chun)、多花秋海棠 (B sinofloribundaL .J.Dorr)及一新种———长柄秋海棠 (B sublongipesY .M .Shui)的特征比较 ,订正了中国秋海棠属等翅组 [Sect Petermannia (Klotzsch)A .DC .],使该组在中国增至 3个种。     

中国秋海棠属新植物(续)

Begnia biflora Ku, sp. nov. (Sect. Coelocentrum Irmsch. ) Habitu B. brevicauli Ku similis, scapis haud foliatis, foliorum laminis reniformibusvalde inaequilateralibus subtus cum petiolis crispule brunneo-pubescentibus. Herba perennis parva. Rhizoma transversale, terete 1.8～3 cm longum, 2.5～5 mmdiam.,scabrum, nodis densis squamis numerosis membranaceis praeditis et radices nu-merosas graciles edentibus, folia basalia et scapum edens. Folia basalia longe petiolata; lami-     

云南东南部秋海棠属侧膜组一新种

吴氏秋海棠　新种 (侧膜组 )　图 1ＢｅｇｏｎｉａｚｈｅｎｇｙｉａｎａＹ .Ｍ .Ｓｈｕｉ,ｓｐ .ｎｏｖ .(ｓｅｃｔ.ＣｏｌｏｅｃｅｎｔｒｕｍＩｒｍｓｃｈ .) ,Ｆｉｇ .1ＳｐｅｃｉｅｓｓｉｍｉｌｉｓＢ .ｌｕｚｈａｉｅｎｓｉＫｕ ,ｑｕａｅｆｏｌｉｏｒｕｍｌａｍｉｎｉｓｉ     

云南秋海棠属三新种

尖被秋海棠　新种　图 1ＢｅｇｏｎｉａａｃｕｔｉｔｅｐａｌａＧｕａｎｅｔＴｉａｎ ,ｓｐ .ｎｏｖ .(Ｓｅｃｔ.Ｂｅｇｏｎｉａ)ＳｐｅｃｉｅｓＢ .ａｓｐｅｒｉｆｏｌｉａｅＩｒｍｓｃｈｅｒｅｔＢ .ｌａｂｏｒｄｅｉＬ啨ｖｌ.ａｆｆｉｎｉｓ,ｄｉｆｆｅｒｔａｂｉｌｌａｓｃａｐｉｓｅｆｏｌｉｏｌａｔｉｓ ,ｌａｍｉｎｉｓｆｏｌｉｏｒｕｍｎｏｎｌｏｂｕｌａｔｉｓｖｅｌｄｕｐｌｉｃａｔｏ -ｓｅｒｒａｔｉｓ ,ｔｅｐａｌｉｓｅｘｔｅｒｉｏｒｂｕｓｏｖａｔｏ -ｌａｎｃｅｏｌａｔｉｓａｐｉｃｅａｃｕｍｉｎａｔｉｓ;ａｂｈａｃｉｎ…     

广西秋海棠属(秋海棠科)4新种

描述了广西秋海棠属(秋海棠科) 的侧膜胎座组和秋海棠组4新种。     

云南秋海棠属植物小志

描写了云南产秋海棠属６个新种１个新变种,它们是澜沧秋海棠、角果秋海棠、盈江秋海棠、粉叶秋海棠、蔓耗秋海棠、斜叶秋海棠、红毛香花秋海棠,补充描述了８个种及新命名１种,即四棱秋海棠、不显秋海棠、薄叶秋海棠、截裂秋海棠、长柔毛秋海棠、光叶秋海棠、变色秋海棠、假厚叶秋海棠、河口秋海棠。     

云南秋海棠属植物小志

描写了云南产秋海棠属6个新种1个新变种,它们是澜沧秋海棠、角果秋海棠、盈江秋海棠、粉叶秋海棠、蔓耗秋海棠、斜叶秋海棠、红毛香花秋海棠,补充描述了8个种及新命名1种,即四棱秋海棠、不显秋海棠、薄叶秋海棠、截裂秋海棠、长柔毛秋海棠、光叶秋海棠、变色秋海棠、假厚叶秋海棠、河口秋海棠。     

Additional Notes on the Begonia Sect. Petermannia (Begoniaceae) from China

Begonia pellionioides YM. Shui & WH. Chen, a new species of the genus Begonia L. (sect. Petermannia (Klotzsch) A. DC., Begoniaceae), is described and illustrated. The new species is endemic to limestone areas in Southeastern Yunnan Province, China, and is most similar to Begonia hainanensis Chun & F. Chun but distinguished by its more elongated leaves with cuneate base and acuminate to caudate apex, tepals adaxially with spiny hairs and sharply triangular capsule wings with truncate superior margin. Besides, the unknown flower morphology of previously published Begonia sublongipes YM. Shui in Begonia sect. Petermannia is described.     

Two New Records of Begonia L. (Begoniaceae) from China

Two species of Begonia L. (Begoniaceae), viz. Begonia demissa Craib and Begonia subperfoliata Parish ex Kurz are reported as new records in China, and the two species assigned to Begonia sect. Parvibegonia A. DC. and Begonia sect. Diploclinium (Wight) A. DC. respectively. The type locality of Begonia demissa is in Thailand and of Begonia subperfoliata in Myanmar. The distribution of Begonia demissa is now extended to Mengyuan, Mengla County of Xishuangbanna Dai Autonomous Prefecture and that of Begonia subperfoliata to Liushun Community, Pu’er City, both in Yunnan province, China.     

Karyomorphology of Taiwanese Begonia (Begoniaceae): taxonomic implications

 The karyomorphology of all 14 species of Taiwanese Begonia was investigated to elucidate their chromosome features and chromosomal evolution. Among all species investigated, differences in chromosome features are found in: (1) chromosome number 2n = 22, 26, 36, 38, 52, 60, 64, 82, and (2) frequencies of chromosomes with secondary, tertiary, and/or small constrictions of polyploids, ranging from 23% to 63%, which is higher than the expected value of about 9%. It is suggested that after polyploidization from the diploid species (i.e., 2n = 22 and frequencies of chromosomes with secondary, tertiary, and/or small constrictions of polyploids of about 9%), chromosome translocations occurred, followed by a decrease in chromosome number, and subsequently stabilized genomes were formed in various species in Taiwan. The karyomorphological evidence also suggested that the chromosome morphology has evolved in parallel in the begonias belonging to different sections in Taiwan. The variation in chromosomal features is more complex than the variation in floral and fruit morphologies. Karyomorphological data also supports the recognition of five new species in Taiwan: Begonia bouffordii, B. chuyunshanensis, B. pinglinensis, B. tengchiana, and B. wutaiana. Based on detailed karyomorphological analyses, the taxonomic implications, speciation, and chromosomal evolution in Taiwanese Begonia are discussed. Received: January 22, 2002 / Accepted: March 4, 2002     

应用ITS区序列对秋海棠属无翅组分类学问题的探讨

以侧膜组（Sect.Coeloecentrum)的Begonia cirrosa和单裂组（Sect.Reichenheimia)的B.henryi为外类群,对秋海棠属（Begonia L.)无翅组（Sect.Sphenanthera)9种2变种及秋海棠组（Sect.Begonia)4种进行了ITS区（包括5.8s rDNA)序列的测定。发现该属的ITS序列较一般类群要长一些,所测的序列长度变化范围为648－743bp。这些序列经Clustal X软件排序后序列总长为756个位点,gap做缺失处理时,变异位点和信息位点分别占26.41%和10.11%。运用PAUP4.0b8软件分析,获得6棵最大简约树,步长为286,一致性指数（CI）和维持性指数（RI）分别为0.8287和0.7841,利用6棵最简约树获取严格一致树,并作Bootstrap检测。结果表明：1.支持将原无翅组内子房3室的种类移入秋海棠组,而将子房4室的种保留,成立四室组（Sect.Sphenanthera);2.将B.tetragona作为B.acetosella的异名处理得到一定的支持;3.B.crassirostris的系统位置有待进一步的研究。     

合柱秋海棠——越南北部喀斯特地区秋海棠科盾叶一新种

描述了采自越南北部喀斯特地区秋海棠科（Begoniaceae）盾叶一新种,即合柱秋海棠（Begonia holostyla）。该新种在盾形叶和具黑色斑点的果实特征上相似于肿柄秋海棠（B. pulvinifera）,但是在合生到一半的花柱和新月形的柱头方面则不同,后者花柱基部合生,柱头2次分裂成1个螺旋状的带。此外,讨论了与近缘种肿柄秋海棠的形态差异和地理联系。     

Genetic diversity and gene flow in the morphologically variable, rare endemics Begonia dregei and Begonia homonyma (Begoniaceae)

Begonia dregei and B. homonyma (Begoniaceae), rare plants endemic to coastal forests of eastern South Africa, are two closely related species with high levels of variation among populations in the shape of leaves. Distribution of genetic variation and genetic relatedness were investigated in 12 populations of B. dregei and seven of B. homonyma using polyacrylamide gel electrophoresis. Twelve of the 15 enzyme loci examined were polymorphic, but only seven loci were polymorphic within at least one population. Genetic diversity measures indicated that the among-population gene differentiation represents >90% of the total genetic component in both species considered individually or combined. This indicated restricted gene flow, consistent with the limited dispersal abilities of Begonia generally and the ancient separation of isolated forest patches. Genetic distances among populations are much higher than usually found within species. Allozyme data provide no support for the recognition of B. dregei and B. homonyma as distinct species.