排序方式： 共有20条查询结果，搜索用时 15 毫秒
1.
2.
The name Hydrocotyle chinensis (Dunn) Craib (Apiaceae) used in 《Flora Reipub-
licae Popularis Sinicae》 has had a confused history and is also a later homonym of H. chinesis
L. Hydrocotyle shanii is proposed as a new name for this species to commemorate ProfessorRen-hwa Shan's lifelong study of the Apiaceae. 相似文献
3.
The classical and numerical taxonomy, palynology and the geographical dis-
tribution of the Genus Schizopepon are dealt with in the present paper. Having comme-
nted on various opinions regarding the systematic position of the genus, the present au-
thors consider that C. Jeffrey’s treatment of Schizopepon as a new and monogeneric tri-
be, Schizopeponeae, should be supported.
The gross morphological characters in the genus are assessed from the taxonomic
point of view. Some characters, such as stamens with an elongated connective or not,
different insertions of ovules and various forms of ovaries and fruits, may be used for
distinguishing subgenera.
The pollen grains of all the species were observed under light microscope (LM) and
scanning electron microscope (SEM). The results show that a strong differentiation
has taken place in the pollen of the genus, and in consequence it may be regarded as an
important basis for dividing subgenera and species. Especially it should be pointed out
that degrees of development of colpi and positions of ora are positively correlated with
the external characters used for distinguishing subgenera.
According to the morphological and palynological characters, the genus Schizopepon
may be divided into three subgenera and eight species: 1. Subgenus Schizopepon: 5 spe-
cies, S. bryoniaefolius Maxim., S. monoicus A. M. Lu et Z. Y. Zhang, S. dioicus Cogn.,
S. longipes Gagnep. and S. macranthus Hand.-Mazz.; 2. Subgenus Rhynchocarpos A. M.
Lu et Z. Y. Zhang: 1 species, S. bomiensis A. M. Lu et Z. Y. Zhang; 3. Subgenus Neoschi-
zopepon A. M. Lu et Z. Y. Zhang: 2 species, S. bicirrhosus (C. B. Clarke) C. Jeffrey
and S. xizangensis A. M. Lu et Z. Y. Zhang.
The 8 OTU’s including all the species of this genus and 31 characters, of which 16 are morphological characters and 15 palynological characters, were used in the numerical taxonomic treatment. After standardization of characters, the correlation and distance matrices were computed. The correlation matrices are made to test the various clustering methods. At last, the UPGMA clustering method was selected and its result
is shown in the form of phenogram. The result of numerical analysis is similar to that of the classical classification.
Schizopepon Maxim. is a genus of East Asia-Himalayan distribution. China has all 8 species and 2 varieties, of which 6 species are endemic. Based on the statistics of spedies number, the distribution centre of the genus is considered to be in the Hengduan Mountains (Yangtze-Mekong-Salwin water divides) and the adjacent areas of the southwest China. 相似文献
4.
应用光学显微镜、扫描电镜和透射电镜对水鳖科Hydrocharitaceae 9属15种植物的花粉形态进行
了观察。水鳖科植物花粉为圆球形至近椭球形，无萌发孔或偶为单沟萌发孔，外壁纹饰通常为小刺状纹
饰，刺密集或稀疏，花粉表面具瘤状、疣状、颗粒状、皱波状突起或光滑。外壁由覆盖层、柱状层和基层组
成。覆盖层厚或较薄，柱状层小柱发育不明显，基层薄。水鳖科植物在花粉大小、纹饰类型、刺的长短、
密度、形态、萌发孔的有无以及花粉壁的结构等方面表现出了较为明显的差异，这些特征对探讨类群间
关系具有较重要意义。由于黑藻属Hydrilla和Stratiotes属花粉较为特殊，支持将它们各自作为一个独立
的族处理。水鳖科植物花粉外壁纹饰和结构特点表明该科与水雍科Aponogetonaceae、泽泻科Alismataceae
和花蔺科Butomaceae等近缘，而该科植物花粉大多无萌发孔等则反应了该科与茨藻目Najadales植物有密切联系。 相似文献
5.
桦木科植物叶表皮的研究 总被引：6，自引：0，他引：6
本文利用光学显微镜及扫描电镜观察了桦木科6属、38种植物的叶表皮。发现该科植物成熟叶片的气孔器有四种类型：即无规型、轮列型、不典型辐射型和短平列型，叶表皮性状及性状状态对于桦木科植物属的确定和族的划分具有重要的分类学价值。在确定叶表皮性状的演化趋势时，综合了其他方面的研究成果(如Abbe，1935，1974；Brunner和Fairbrothers，1979；Hall，1952；Kikuzava，1982；Kuprianova，1963)，并且发现叶表皮形态对于揭示桦木科植物的属间演化有较大的参考价值。作者认为：叶表皮特征支持将桦木科分成两个族；气孔器无规则型、气孔器外拱盖单层、气孔器在保卫细胞极区无”T”型加厚以及下表皮细胞垂周壁平直为原始的叶表面性状；下表皮细胞垂周壁具波纹和气孔器为不典型辐射型等特征仅发现于榛属、虎榛子属，铁木属和鹅耳枥属，从而将榛族与桦木族分开；桦木族包括桦木属和桤木属，由于具有较多的原始性状而比榛族原始，在榛族中，鹅耳枥属最为特化(见图1)。 相似文献
6.
自然界的生命多种多样,繁衍生息、不断变化,形成了纷繁复杂的世界。生命进化现象一直是生物学家关注的焦点,生物的系统发育和进化机制是探索生命奥秘的主要内容之一。在北京香山,有一个锲而不舍的研究群体,一直在孜孜不倦地致力于探索植物系统发育和进化的过程和机制的研究,这就是中国科学院植物研究所系统与进化植物学重点实验室。2001年,以该实验室中青年研究骨干为核心、以葛颂研究员为学术带头人组成的研究群体,获 相似文献
7.
张志耘 《中国科学院研究生院学报》1986,24(4):297-303
The present paper deals with taxonomic studies on the genera Lathraea
Linn. and Christisonia Gard. (Orobanchaceae) in China. In the genus Lathraea, only a
single species in China, L. japonica Miq., is recongnized in the paper. It occurs in sou-
thern Shaanxi, southern Gansu, southeastern Sichuan, northern Guizhou and northern
Guangdong, also in Japan. L. miqueliana Franch. et Sav., L. chinfushanica Hu et Tang
and L. japonica Miq. var. miqueliana (Franch. et Sav.) Ohwi are treated as new synon-
yms of L. japonica Miq. in this paper.
In the genus Christisonia, the most of collections from China, which were identi-
fied as C. sinensis G. Beck before, are treated as a new synonym of C. hookeri C. B.
Clarke. A few collections of this genus from China, which were mistakenly described
as Gleadovia lepoense Hu snd G. kwangtungense Hu, should be transferred to Christi-
sonia hookeri C. B. Clarke. It is distributed in southeastern and south China, westwards
to the Himalayas. 相似文献
8.
本文所讨论的胡桃目的概念包括胡桃科和马尾树科。作者详细地对该类群植物性的分化，果实
传播方式及分化，生态及地理的分化等方面进行了较系统的分析，最后探讨了该目的系统位置，认为胡桃目与杨梅目和山毛榉目有密切的联系，是金缕梅类植物演化最高级的一个类群。 相似文献
9.
作为对英文版《Flora of China》金缕梅科的分类学修订结果,本文提出了10个新异名,其中蕈树属Altingia Noronha、金缕梅属Hamamelis Linn．、红花荷属Rhodoleia Champ．各一个新异名,蚊母树属Distylium Sieb．et Zucc．3个新异名,半枫荷属Semiliquidambar Chang 4个新异名,并分别进行了讨论。 相似文献
10.
我国数字资源建设与共享研究现状述评 总被引：3，自引：0，他引：3
本文分析总结了我国数字资源建设与共享的研究现状，并结合笔者的知识背景，对今后该问题的深人研究提出了几点改进建议。 相似文献