Table of Contents
  • Volume 23 Issue 2

      
      Research Articles
    • Liang Yuan-Hui, Yu Cheng-Hong
      1985, 23 (2): 81–90
      Since the establishment of the family Styracaceae by Dumortier in 1829, 15 genera have been associated with it. Its components and circumscription were debated often and are still Waiting for evidences other than megamorphology to further clarify. The present paper contributes the knowledge of pollen morphology for this purpose. Pollen grains of 13 genera and 93 species in the family (sensu lato) were observed and described. Based on our own observation and data from other authors, 3 pollen types may be distinguished; viz., Styrax-type (including: Styrax, Alniphyllum, Bruinsmia, Pamphilia, Huodendron, Halesia, Pterostyrax, Rehderodendron, Melliodendron, Sinojackia, Parastyrax) ; Afrostyrax-type (Afrostyrax, Hua, Lissocarpa) and Symplocos-type ( Symplocos ) . In Wagenitz’s (1964) system of the family Styracaceae, the genera Symplocos, Afrostyrax, Hua and Lissocarpa are excluded. Its components are the remained 11 genera. It is interested enough that their pollen grains are all of the Styraxtype. Obviously, Wagenitz’s Styracaceae is very natural from the viewpoint of pollen morphology. Concerning the intergeneric relationships, almost all variations observed in the pollen of the 10 small styraceous genera are encountered in the large genus Styrax. The genus Styrax seems to be the stock of this family, and the others, the final products derived from it in the course of evolution.
    • Tang Yan-Cheng, Zhang Wu-Xiu
      1985, 23 (2): 91–96
      In the present paper the pollen grains of Convallaria majalis L., Speirantha gardenii (Hook.) Baill., Reineckea carnea (Andr.) Kunth and Theropogon pallidus (Wall. ex Kunth) Maxim., all the unique member of their own genus in the tribe Convallarieae were examined under light microscope (LM) and scanning electron microscope (SEM). They can be divided into two groups. The Pollen grains of the first three species are larger (39.95-49.35×21.15-30.55 μ ), with thick granular-finely-reticulate or finely reticulate (LM) and finely reticulate (SEM) exine, and with distinct differentiation of sexine and nexine. The pollen grains of the other species are much smaller (25.85×18.8μ), with thin psilate (LM) and minutely granular (SEM) exine, and with indistinct differentiation of sexine and nexine. According to Nair and Sharma (1965), the exine surface ornamentation is a significant morphological character helping a great deal in the categorization of various genera and species within Liliaceae. The wide range of exine patterns provides ample evidence for tracing pollen evolution within the family from a retipilate to psilate condition by the processes of fusion, zonation and reduction. If their viewpoint is correct, the pollen of Theropogon may be regarded as a type more advanced than that of the remaining 3 genera of the tribe Convallarieae. Besides the differences in pollen morphology, Theropogon also differs from the other 3 genera in the characters listed in the table. The data taken from the other authors are indicated. Though there are some significant differences between Theropogon and the other 3 genera, the present authors, in a discreet attitude, merely point out the problematic systematic position of Theropogon in the tribe and would like neither hastily to give it a subtribal or tribal rank nor to transfer it to another tribe before an overall study.
      Character Theropogon pallidus Convallaria majalis Speirantha gardenii Reineckea carnea
      Root system stout rhizome without stolon stout rhizome with slender stolon stout rhizome with slender stolon creeping stolon without rhizome
      Bracteole at the base of pedicel present absent absent absent
      Chromosome number (2n) 40 (kurosawa 1977) 38 (Therman 1956) 38 (Yang et Zhu 1983) 38 (Therman 1956)
      Nectiferous cells of perianth lower adaxial base of outer tepal with a zone of nectiferous(secretory)cells (Utech 1979) absent from the inner surface of the floral tube (Utech 1979)
      Vascular system of gynoecium ventral plexus: simple ascending ventral (V) supply with direct, horizontal funicular (F) supply; two ventrals (V) per septum (Utech 1979) ventral plexus: simple ascending ve ntral (V) supply with parallel, ascending placental bundles, funicular(F) traces associated (1:1) with placental (P) bundles; two ventrals (V) per septum, four or more placentals per septum (Utech 1979)
      bmbryo sac Polygonum-type (Stenar 1953) modified Allium-type (Stenar 1953) (Maheshwari 1950)
    • Pan Ze-Hui, Chin Hui-Chen, Wu Zhu-Jun, Yuan Chang-Qi, Liou Shou-Lu
      1985, 23 (2): 97–102
      Chromosome numbers are reported for 26 species and varieties of Umbelliferae which belong to 3 subfamilies and 19 genera in this paper. Of these, 13 counts are new records and some problems about chromosome numbers of Umbelliferae are simplydiscussed.
    • Chen Rui-Yang, Chen Zu-Geng, Li Xiu-Lan, Song Wen-Qin
      1985, 23 (2): 103–105
      The present work reports the chromosome numbers of 30 species of 7 genera of Magnoliaceae in China. The chromosome numbers of Liridendron chinense, Magnolia officinalis, M. liliflora, Michelia rigo and M. champaca are consistent with those previously reported Magnolia denudata was reported 2n=114, but our result shows 2n= 76; M. grandiflora was reported 2n=112, 114, but here 2n=114. Chromosome numbers of the other 23 species are reported for the first time. Vouchers for experimental materials have been preserved in Herbarium of the Department of Biology, Nankai University, Tianjin.
    • Lu An-Ming, Zhang Zhi-Yun
      1985, 23 (2): 106–120
      The classical and numerical taxonomy, palynology and the geographical distribution of the Genus Schizopepon are dealt with in the present paper. Having commented on various opinions regarding the systematic position of the genus, the present authors consider that C. Jeffrey’s treatment of Schizopepon as a new and monogeneric tribe, 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 species, 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 Neoschizopepon 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.
    • Wu Cheng-Yih, Chen Zong-Lian
      1985, 23 (2): 121–143
      the present paper is a meterial of the genus Hemsleya Cogn. for flora of China-Cucurbitaceae. The genus Hemsleya was established by C. A. Cogniaux in 1889. By 1982 about 7 species had been discovered in China, and most of them are mainly distributed in S. W. China, particularly in Yunnan and Sichuan. Their tubers have been used as a folk medicine for a long time. However, we began to search for them, and meanwhile collect and cultivate them, only about ten years ago. After a general survey and taxonomical study, 20 species of Hemsleya are recorded from Yunnan in the paper. Among them 18 species and 3 varieties are new. All the types are kept in Herb. KUN. According to the characters, of corolla and fruit also the seed condition, widely or narrowly winged, proposed are four sections, namely: Sect. I. Craciliflorae; Sect. II. Amabiles; Sect. III. Carnosiflorae and Sect. IV. Hemsleya, among which 3 are new.
    • Li Hen
      1985, 23 (2): 144–148
      The present paper reports the first record of the eGnus Stachyphrynium, Marantaceae, in China. It is characterized by solitary spikes, elongated and erect with impricated bracts. The inflorescence arises from a short stem on the rhizome. In this genus there are 14 species in total. They are distributed from Sri Lanke to Java and Borneo, through Indo-China Peninsula, Malay Pennisula. Its distribution center is in Indo-China Penninsula and Malay Penninsula. The north limit lies in southern Yunnan of China. Most species of the genus have a stenochorie area, for example, S. zeylanicum is endemic to Sri Lanka; S. latifolium occurs in Java only and so on. A New species, S. Sinense H. Li, to China, is illustrated and described in Latin.
    • Li Yi-Jan
      1985, 23 (2): 153–160
      Guangdong Province extends across the subtropical and tropical zones. With favorable climate and plentiful rainfall, this district is extremely rich in plants. However, the study on the Charophyta in this province is scanty. The specimens we identified were collected from 4 cities and 10 counties of the province. The result shows that there are abundant representatives of Chrophyta, especially in Nitella, in the province. In this paper, however, only reported are some new taxa of Nitella. The 2 new species are Nitella sessilis and N. guangdongensis; the 3 new varieties are Nitella flagelliformis var. conglomerata, N. brevidactyla var. hainanensis and N. pakistanica var. magniantheridii; and the 3 new records of distribution in China are Nitella bengalensis Kundu, N. madagascariensis Zanev. and N. tenuissima var. sanukensis Imah.
Editors-in-Chief
Song Ge
Jun Wen
Impact Factor
2.779
JCR 2019 IF ranking: 56/234 (Plant Sciences, top 23.72%, Q1 quartile)
Journal Abbreviation: J Syst Evol
ISSN: 1674-4918 (Print)
1759-6831 (Online)
CN: 11-5779/Q
Frequency: Bi-monthly

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