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1.
用3，4-二氧亚甲基苯甲醛通过Claisen-Schimidt反应合成了3，4-二氧亚甲基肉桂醛，再与氨基芳酸缩合制备了三种希夫碱化合物，对所得化合物进行了元素分析，用红外光谱对化合物结构进行了表征。 相似文献
2.
本文合成了三种酞菁金属化合物，用ＩＲ和Ｘ－射线粉末对该化合物进行了脯征；研究了由它们分别组成感光层的光电性质，并用其中光敏高的酞菁氧钒化合物（２－３ｌｕｘ．ｓｅｃ。）制备了激光印机机鼓，得到了好的印样，实际应用１００００张／支鼓的结果。 相似文献
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7.
采用水蒸气蒸馏法分别从甘肃省兰州市的榆中、七里河、西固不同产地百合中提取挥发油.用气相色谱-质谱联用技术（GC-MS）对其挥发油中的化学成分进行分离和结构鉴定,并运用气相色谱峰面积归一法,确定所鉴定出的化合物峰面积相对含量约占挥发油总量.结果显示,不同产地兰州百合挥发油的成分和含量存在一定差异,榆中百合挥发油共鉴定出23种化合物;七里河百合挥发油共鉴定出1 0种化合物;西固百合挥发油共鉴定出54种化合物. 相似文献
8.
9.
胡椒醛缩氨基芳酸希夫碱的合成与表征 总被引：1，自引：1，他引：0
用胡椒醛与氨基酸进行缩合反应,制备了５种胡椒醛氨基芳酸希夫碱化合物。对所得化合物进行了元素分析、用红外光谱和核磁共振氢谱对化合物结构进行了表征。 相似文献
10.
一、发明 1935年瑞典化学家米勒开始探索一种能干扰昆虫而对其他动物无害的化合物。1939年9月,米勒在研究中碰到了一种化合物“二氯二笨基三氯乙烷”,正是自己苦心寻找的那种无臭、价廉、对绝大多数生物几乎无害,但对昆虫则意着死亡的化合物。鉴于化合物名字太长,米勒只取每个英文单词的头一个字母,称其为DDT(中文译作滴滴涕)。 相似文献
11.
马兜铃科的地理分布及其系统 总被引：1，自引：0，他引：1
马金双 《中国科学院研究生院学报》1990,28(5):345-355
马兜铃科基本是一个热带科。 东亚的横断山至华南一带是其原始分布与分化中心，热带美洲是其次生分布与分化中心。科的形态演化趋势是花被由分化的双被到不分化的单被，由分离到合生，由杯状到管状；雄蕊由多数到少数，由分离到与雌蕊结合成为合蕊柱；于房由半下位到完全下位；果实由蓇葖状蒴果到蒴果。马兜铃科分2亚科4族6属。 相似文献
12.
昆栏树属(Trochodendron)、水青树属(Tetracentron)和领春木属(Euptelea)是一群 种数少而较原始的被子植物。它们主要分布于我国。 对于它们的系统位置存在着不同的看 法。因此本研究的目的，一方面为讨论系统位置时提供孢粉学的资料，另一方面也可为鉴定化 石花粉提供依据。 从花粉形态看，支持这三个属分别成立三个科。昆栏树属和水青树属花粉具三沟，而木兰科为单槽类型，因此不同意把它们放在木兰科(或目)。领春木属花粉具皱(rugate)，皱膜上具粗颗粒(短条)，如果皱进一步缩短和增加数目，类似于金缕梅科某些属，因此支持ronquist
(1968)把领春木科放在金缕梅目。Hutchinson(1969)把昆栏树属和领春木属放在同一科(昆栏树科)，从形态结构，导管存在与否，染色体数目，这两属差异较大，同时花粉的形态差别也较大，本文不支持这种观点。 相似文献
13.
马毓泉 《中国科学院研究生院学报》1951,1(1):5-19
Gentiana was originally proposed by Tournefort in 1700. Linnaeus adopted this generic name in his “Genera Plantarum” published in 1737. He divided the genus into seven groups on the basis of different shapes of corolla and forms of floral appendages. In his “Species Plantarum” he reorganized them into three artificial ones. Forty years later, Moench established a new genus, Gentianella under which he described G. tetrandra as the type of his new genus. In the view of identity of Gentianella tetrandra with Gentiana campestris L., it is evident that Gentianella represents only some plants formerly included in Gentiana at Linnaeus time. In 1796, Froelich’s monograph on Gentiana appeared. In his work four sections were represented and one of them was Crossopetalum. In 1845, Grisebach also published a monograph of Gentianaceae and recorded fifteen sections of which Amarella and Imaicola are two of his seven proposed ones. In 1888, Huxley studied the floral structure of Gentianaceae in relation with pollination mechanism and, accordingly, divided the family into two main groups, one with epipetalous glands, the other with glands at the base of the ovary. In each group, four types of flowers were found. He concluded that Gentiana was a complex genus on account of presence of four different types of flowers in this group, and suggested that many species of the genus should be separated out to form some smaller generic categories. Six years after, Kusnezow in his monograph divided Gentiana into two subgenera Eugentiana and Gentianella. In his system, subgenus Eugentiana consists of ten sections and the Gentianella, seven. He contributed much to the systematic treatment of Eugnetiana but little to that of Gentianella. He maintained the genus Gentiana in a broad sense. With increased knowledge of this group in the last thirty years, a number of botanists were able to make a clearer delimitation of true Gentiana and its allies and treated them in more natural way. Moench’s genus Gentianella was rerised. In 1936, H. Smith separated Megacodon from Gentianella as a genus. In the present paper, the writer suggests a generic name Gentianopsis for the section Crossopetalum in the same Genus.
This new genus is characterized by (1) its large and somewhat flattened ellipsoidal flower bud, (2) two dissimilar pairs of calyx lobes which are distichously imbricate in aestivation, (3) four triangular, ciflated intracalyx membranes at the base of and alternate with the calyx lobes, (4) distinct gynophore and (5) enlarged stigma. While in typical Gentianella represented by section Amarella, the flower buds are small and terete, a laciniate corona is usually present, and the calyx-lobes are leafy, lanceolate, imbricate, and not provided with intracalyx membrane.
Besides the morphological characters mentioned above, the anatomical structure of
the floral parts is also a significant generic criterion. In Gentianopsis, eight vascular
bundles are present in calyx, representing four dorsals and four fused ventrals. In each
corolla-lobe there are five bundles. In the body of ovary six bundles are present. The
ovule bearing surface is extensive covering nearly to entire surface of the ovary wall with
the exception of a narrow longitudinal zone along the dorsal bundle. In Gentianella,
calyx bundles are three in each lobe, without fusion of the ventrals. In each corolla-
lobe, the bundles are three instead of five as in Gentianopsis but the lateral ones branch
once dichotomously after entering the base of corolla. In the body of ovary only four
main bundles are present due to the fusion of smaller ventral ones. The placentation
is confined to the region of the ventral bundles.
Phylogenetically Gentianopsis and Gentianella may be regarded as closely reIated
and may represent branches of a common line with Gentianopsis standing at a lower
level, Gentianella being more advanced. In Gentianella the number of bundles in the
corolla segments and ovary wall are reduced by partial or complete fusion and the
distribution of ovules is confined only to the region of the ventral bundles. However,
in the calyx of Gentianopsis there is fusion of ventral bundles, whereas the correspound-
ing bundles in the Gentianella remain separate. The Gentianopsis-Gentianella line on
the one hand and the Gentiana line on the other may come again from a common
acestral stock. Gentiana possesses only three bundles in each corolla-lobe. A variety
of plicate between corolla lobes except in case of Gentiana lutea and intracalyx membrane
above the throat of calyx-tube are also the common structures in Gentiana. Thus the
pollination mechanism is highly specialized in the genus. As far as we know, in
Gentiana the glandular appendages usually exist at the base of ovary. If those nectarial
processes are correctly interpreted as the representatives of staminodes, gentiana would,
undoubtedly, be derived from an ancestral form with hypogynous diplostemonous
androecium, and bears no direct relationship to Gentianopsis or Gentianella in which the
glands are epipetalous. It may be reasonable to conclude the Gentiana and Gentianopsis-
Gentianella line are two parallel derivatives from a common ancestor which has the
floral characters of two series of hypogynous stamens. Gentianopsis and Gentianella may
represent branches of a common line with Gentianopsis standing at a lower level,
Gentianella being more advanced. Their relations may be diagrammed below:
Gentianopsis
Gentianella
Common ancestor
Gentiana
This new genus consists of fourteen species and two varieties in the world. Onlyeight species and two varieties are represented in China. They are G. barbara, G. barbatavar. sinensis, G. grandis, G. scabromanginata, G. paludosa, G. nana, G. longistyla,G. lutea, G. contorta, and G. contorta var. Wui. The species of present genus occur in the alpine regions of North Hemisphere. InChina t,hey are distributed in Kokonor, Kansu, Shensi, Shansi, Chahar, Hopei, Manchuria,Hupeh, Szechuan, Sikang, Tibet, and Yunnan. G. Yabei (Takeda et Hara) is foundin Japan, G. detonsa (Bott&) in North Europe, G. ciliata (Linn.) in South Europe,G. crinita (Froel.) G. procera (Holm.) and G. degans (A. Nels) in North America.G. barbata is the most widespreading species and reported in Sibiria and China.G. contorta (Royle) is a common plant in Himalayan mountaineous range, China andNorth part of India. The species and varieties cited in this paper are as follows:
t. Gentianopsis barbata (Froel.) comb. nov.
la. Gentianopsis barbata (Froel.) var. sinensis, var. nov.
2. Gentian opsis grandis (H. Sm.) comb. nov.
3. Gentianopsis scabromarginata (H. Sm.) comb. nov.
4. Gcntianopsis paludosa (Munro) comb. nov.
5. Gentianopsis nana sp. nov.
6. Gentianopsis longistyla, sp. nov.
7. Gentianopsis lutea, sp. nov. 相似文献
14.
鄂西神农架地区的植被和植物区系 总被引：1，自引：0，他引：1
Shennungia is generally known as “The highest mountain in Central China”. It is
situated at latitude 31°342'N., longitude 110°35'E. in western Hupeh.
The area explored is deeply cut in all sides by five V-shaped valleys, giving the
landscape a steep topography. Its summit is about 3105 meters above the sea level, and
the relative altitude is from 1000-2000 meters.
The climate of the region is warm temperate. The differences of humidity-warmth
condition between the eastern and the western flanks are quite marked.
In western Hupeh and the adjacent area of Szechuan the rugged topography still
preserves some tracts of natural forests at higher elevations. Our vegetational survey
is confined to localities above 1500 meters. The collection of plant samples of the flora
is extended to the whole mountain from the foothill to the peak. The present article
deals with only a part of the results of our survey.
1. The vertical vegetation belts of Mt. Shennungia and relationships with other
regions: The vegetation belts on the eastern and the western flanks of the mountain
are shown in diagram 2 and 3. The comparison of the vertical vegetation zones of the
Mt. Shennungia with those of the Yülungshan in N. W. Yunnan and the eastern
Himalaya to the west and with those of Hwangshan and Central Japan to the east
is shown in table 4, It shows that the plant communities of the Mt. Shennungia are of
temperate nature, and they are more closely related to those of Hwangshan in S.
Anhwei and of Central Japan than to the eastern Himalaya.
2. Floristic composition: The generic ranges of flowering plant are relatively
distinct and stable. Various distributional patterns of genera are analysized.
1) Statistics of the genera in various distributional patterns: The total number
of genera of flowering plants in this region are 762, belonging to the following four
categories. A) tropical genera 239 (31.3%), B) temperate genera 416 (54.7%), C)
endemic genera 47 (6%), and D) comsmopolitan genera 61 (8%).
2) Endemic genera: An examination of the composition of the flora in western
Hupeh reveals that 47 endemic Chinese genera occur in this mountain of which 24 are
monotypic genera, 20 oligotypic and 2 multitypic as shown in Table 4. The arborescent
genera are nearly all deciduous. They are of temperate nature.
3) Temperate genera: There are 416 genera in wastern Hupeh. They are
subdivides into the following three groups according to their distributional patterns:
A) The north temperate genera: There are 159 genera belonging to 62 families in
western Hupeh. B) Eastern Asian genera: There are 117 genera belonging to 69
families in western Hupeh. Among them 22 are common to the western Szechuan,
adjacent regions of Yunnan and the Eastern Himalaya. The remaining 95 genera are
commom to both eastern China and Japan. C) The Eastern Asian-eastern North-
American genera: Of the total 762 genera known in western Hupeh, 64 are disjunc-
tively distributed in both eastern Asia and eastern North-America.
4) The tropical genera: Of the 762 genera of the flowering plant of western
Hupeh, 239 (31%) are of tropical nature.
Finally, our survey shows: 1. Many of the primitive temperate genera and ende-
mic relicts concentrate in western Hupeh and the adjacent region of Szechuan indica-
ting that it might be one of refuges of tertiary flora. Moreover, it might also be one
of the most important regions of differentiation, development and distribution of tem-
perature flora. 2. The vegetation of this region is not only of temperate nature, but
also of a transitional nature. 3. According to an analysis of the flora and a compari-
son of the vertical distribution of the vegetation of Yülungshan and Eastern Himalaya
to the west with Hwangshan and Central Japan to the east, the floristic affinity of
western Hupeh is more closely related to eastern China and Central Japan rather than
to the Eastern Himalaya, and phytogeographically this region is intermediate between
the Sino-Himalayan and the Sino-Japanese patterns. However, the problem of phyto-
geography of western Hupeh and the adjacent region of Szechuan is a complicated
one requiring further study.
相似文献
15.
蔷薇科植物的起源和进化 总被引：1，自引：0，他引：1
俞德浚 《中国科学院研究生院学报》1984,22(6):431-444
Rosaceae. consisting of about 126 genera and 3200 species, is widely distribu-
ted in warm temperate and subtropical regions of the Northern Hemisphere, while more
than half of the genera are Asiatic and more then 80% of the total number of Asiatic
occur in China (Table 1). In this paper, the origin and evolution of Chinese genera is
discussed mainly. The principal tendency of the whole family is also described from
the point of view of evolution.
First of all, the systematic position of Rosaceae in Angiospermae is reviewed. Ac-
cording to the records of paleobotany, rosaceous plants occurred first in the Tertiary,
from the early period of Eocene (genera such as Spiraea and Prunus) to the late period
of Miocene (e.g. Crataegus, Malus amd Rosa). They have quite a long history in geolo-
gical data. Where has this big and old family originated and what steps does it stand in
the long course of evolution of flowering plants? There are several opinions and ex-
planations by different authors. In this paper, a general survey of the six prevailing
classical systems (Table 2) is made to give a brief idea of the position of this family
in the Angiospermae and of the relationships between the subfamilies and also the rela-
tionships between different genera in each subfamily. At the end of this paper, an at-
tempt is made to analyse and sum up the major evolutionary tendency of the whole fa-
mily.
As generally condidered, Rosaceae originated from Magnoliales, and woody plants
of the family still hold a dominant position. For instance, subfamily Spiraeoideae con-
sists of only one herbaceous genus (i.e., Aruncus) and subfamily Rosoideae only a few
herbaceous genera. All of these herbaceous genera are derived from the closely related
woody genera of the same subfamily.
In the course of evolution of Angiospermae, Rosaceae stands at the initial to the
middle stages of development. All parts of plant body in this family are at the chang-
ing and developing stages, with carpels, fruits and inflorescences being the most active.
The primitive types in this family, such as the members of subfamily Spiraeoideae,
usually have 5 and free carpels, the number of which are either reduced to 2-1 or in-
creased to 10-numerous. They have different levels of union and are either completely
free from each other or coherent at base. The carpels usually occur on the upper part of
the receptacle, because the shapes of receptacle are variable, sometimes disk-shaped, cup-
shaped, tube-shaped or even bottle-shaped. In the last case carpels grow inside the rece-
ptacle. Thus the position of carpels has changed from superior to inferior through half-
superior.
In accordance with the development of the carpels, various kinds of fruits are produ-
ced. The primitive types of fruit are follicles, with dry, dehiscent carpels opened along
different sutures. The next step, the carpels have developed into an indehiscent, I-celled
and l-seeded fruit, the so-caned achene. In different genera, the achenes have different
coat types and appendages to facilitate dispersing the seeds. Some of the achenes grow
upon the fleshy receptacle (like strawberry) and some of them inside the fleshy rece-
ptacle (like rose). Sometimes a few carpels are united with the receptacle and develop
into a pome (like apple and pear). Another direction of the fruit development is the
single carpel with fleshy exocarp and mesocarp, and a bony endocarp, then becoming a
drupe (like peach and plum).
In addition to fleshy receptacle of thickened fruit coats, they usually have showy
colour, fragrant smell and also plenty of sugars, acids, vitamins, etc. which are edible
and attract animals and human beings to assist the dispersion of seeds.
In this family, there are various types of flower arrangements, both indefinite inflo-
rescences including raceme, umbel, corymb and panicle, and the definite inflorescence,
such as solitary flower, cyme and compound cyme. In the evolution course, they tend
to change mostly from multiflowered compound inflorescence towards few-flowered sim-
ple inflorescence, and finally becoming a solitary flower: simultaneously with the decre-
asing of number of flowers on the inflorescence, the increasing of size of petals, which
become very showy for attraction of insects so as to guarantee pollination and fertiliza-
tion of the plants concerned. Another tendency, if the bisexual flowers change to uni-
sexual, either monoecious- or dioecious-polygamous, then they form a dense spike which
is beneficial to cross pollination. The abundance, diversity, and wide range of distribu-
tion of the species and genera of Rosaceae are considered mainly resulted from their
highly developed reproductive organs. 相似文献
16.
中国种子植物特有属的数量分析 总被引：3，自引：0，他引：3
王荷生 《中国科学院研究生院学报》1985,23(4):241-258
Chinese flora with many endemic elements is highly important in the world’s
flora. According to recent statistics there are about 196 genera of spermatophytes, be-
ing 6.5% of total Chinese genera. These endemic genera comprising 377 species belong
to 68 families, among which the Gesneriaceae (28 genera), Umbelliferae (13), Compo-
sitae (13), Orchidaceae (12) and Labiatae (10) are predominant. The tropical type
containing 24 families and 80 genera is dominant. After it follows the temperate type
with 23 families and 50 genera. There are also 4 families endemic to China, i.e. Gin-
kgoaceae, Bretschneideraceae, Eucommiaceae and Davidiaceae. It shows that genera
endemic to China are obviously related to the tropical and temperate flora in essence.
The endemic monotypic genera (139) and endemic obligotypic genera (48) combin-
ed make up more than 95% of the total number of genera endemic to China. Phylo-
genetically more than half of them are ancient or primitive. The life forms of all ende-
mic genera are also diverse. Herbs, especially perennial herbs, prevail with the propor-
tion of about 62%, and trees and shrubs are the next, with 33%, and the rest are lianas.
Based upon the calculated number of genera endemic to China in each province and
the similarity coefficents between any two provinces, some conclusions may be drawn
as follows:
Yunnan and Sichuan Provinces combined are the distribution centre of genera en-
demic to China and may be their original or differentiation area, because numerous
endemic genera, including various groups, exist in these two provinces. The second is
Guizhou where there are 62 endemic genera. Others form a declining order, south
China, central China and east China. But towards the north China endemic genera de-
crease gradually, and the Qinling Range is an important distributional limit.
The largest simitarity coefficient, over 50%, appears between Shaanxi and Gansu
probably because of the Qinling Range linking these two provinces. But between any
other two provinces it is less than 30% and it is generaly larger between two south pro-
vinces than between two north provinces.
These characteristics mentioned above are correlated with topography and climate,
and they may be resulted from the diversification in geography and climatic influence
for a long time. 相似文献
17.
本文报道浙江产菝葜属smilax 7个种的染色体数目和核型。S．nipponica有两种核型，2n＝
26和2n=32，均为3B型，但后一种细胞型的雄株的第一对染色体大小不等，可能为性染色体；S.
riparia 2n=30，属3B型；S．siebodii n＝16；S. china有两个染色体数目，2n＝96 和n＝15；
S. davidiana 2n=32，属3B型，对减数分裂MI的观察发现n＝16；S．glabra 2n=32，亦属3B
型：S. nervo-marginata var．liukiuensis 2n=32，属3C型。讨论了种间在核型上的差异、属的基数、
核型演化趋势和性染色体等问题。 相似文献
18.
本文对湖北省三种泽泻属 Alisma L. 植物进行了核型分析和形态研究。 结果表明：
泽泻 A．plantago-aquatica L. 和东方泽泻1) A. orientale (Sam．) Juzep． 2n=2x=14，窄叶
泽泻 A．canaliculatum A．Br. Bouche 2n=6x=42。 其中东方泽泻的核型是未报道过的新
类型，这与前人所提出的该属植物核型为同型的结论不同，且泽泻和东方泽泻在形态方面亦有
很大差异，因而支持将泽泻和东方泽泻分立两种的观点。又结合前人的工作，讨论了该属植物
核型变异的三种式样。 相似文献
19.
张志耘 《中国科学院研究生院学报》1988,26(5):394-403
The morphological characters in the genus Orobanche were evaluated from the
taxonomic point of view. The author finds that the plants of this genus are relatively similar
to each other in respect to characters of vegetative organs, fruits and seeds. But the differences
in the floral structures can be served as a basis for delimitating infrageneric taxa. The seed
coat of 18 species and pollen grains of 6 species were also examined under scanning electron
microscope (SEM). They seem to have little significance for distinguishing species.
The result supports G. Beck’s (1930) division of the genus Orobanche into 4 sections, of
which 2 occur in China, based on the characters of the inflorescence, bracteoles and calyx.
The author considers that some characters, such as anther hairy or not, upper lip of corolla
entire or not, lower lip longer or shorter than the upper one, the state of corolla-tube inflec-
tion and the hair type of filaments and plants, are important in distinguishing Chinese species.
A key to the species of Orobanche in China is given.
This genus consists of about 100 species, and is mostly confined to Eurasia, with over 60
species found in Caucasus and Middle Asia of USSR, where may be the mordern distribu-
tional centre.
Orobanche L. in China is represented by 23 species, 3 varieties and l forma. As shown in
Table 1, most species (12 species) are found in Xinjiang, which clearly shows a close floristic
relationship between this region and Middle Asia of USSR. 6 species are endemic to China,
of which 4 are confined to the Hengduan Mountains (Yangtze-Mekong-Salwin divide).
The relationships between this genus and related ones of Orobanchaceae are also discussed.
The author holds the following opinions: the genus Phelypaea Desf. should be considered as a
member of Orobanche L. Sect. Gymnocaulis G. Beck, the monotypic genus, Necranthus A.
Gilli endemic to Turkey, is allied with Orobanche L. Sect. Orobanche, the monotypic genus,
Platypholis Maxim, endemic to Bonin Is. of Japan, is far from Orobanche L. in relation and
should be regarded as a separate genus.
The 11 OTU’s, including all the sections of Orobanche L. and 7 genera of Orobanchaceae,
and 15 morphological characters were used in the numerical taxonomic treatment to test the
above-mentioned suggestions. After standardization of characters, the correlation matrices were
computerized. The correlation matrices were made to test the various clustering methods. At
last the UPGMA clustering method was chosen and its result is shown in a phenogram. The
result of numerical analysis is basically in accordance with the suggestions. 相似文献
20.
王文采 《中国科学院研究生院学报》1980,18(3):266-282
1. Having analyzed the external morphology of the genus Microula, the author
has proposed a series of criteria as bases for the construction of a classification scheme
of this genus. The most important ones are as follows:
1) The normally developed stem is primitive, and the strongly abbreviated stem
more advanced.
2) The small inconspicuous bracts are more primitive than the large suborbicular
densely arranged ones, which almost entirely cover the flowers and the fruits.
3) Nutlets with small dorsal pit are more primitive than those with larger pit
on one hand or those without it on the other.
4) The dorsal pit with simple margin precedes that with double margins.
5) Nutlets with subbasal areola precede those with lateral or apical areola.
6) Nutlets without glochids precede those with glochids.
2. Basing upon these criteria the genus Microula may be divided into six sections.
The section Schistocaryum may be the primitive one, and the others may be evolved
from it respectively. The possible affinities between them are demonstrated in figure
no. two.
3. The genus Microula, containing 30 species, is mainly distributed in the
Chinghai-Tibetan plateau and the majority of its species concentrates in the eastern
border of the plateau, and of the 30 species 26—that is 90 percent—are endemic
to China, and the remaining 4 are distributed elsewhere in China, too, and extending
southward and westward to Bhutan, Sikkim, Nepal and Kashmir respectively. In the
region between Heishui, Province Szechuan, and Chinghai Lake there are 9 species,
which, curiously, represent all the six sections of Microula, hence this region seems to
be the center of maximum variation of this genus. M. ovalifolia whose nutlets have
small dorsal pit and subbasal areola may be considered the most primitive species.
Thus the author is of the opinion that the western part of province Szechuan, to
which M. ovalifolia is endemic, may probably be the center of origin of the genusMicroula. 相似文献