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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (2): 223-234.DOI: 10.11686/cyxb20140227

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Morphological study of the leaf structures of Viola in northeastern China and discussions of their taxonomic values (Violaceae)

SUN Xue-qin, LIU Mei, SUN Tian-hang, ZHANG Xing-xing, SHI Chuan-qi   

  1. College of Life Science and Technology, Harbin Normal University, Harbin 150025, China
  • Received:2013-08-27 Online:2014-02-25 Published:2014-04-20

Abstract: The leaf structures of 28 species and 1 variety of Viola in northeastern China were studied in this paper using GMA method and peeling leaf epidermis method. The results show the leaf shapes of the genus are cordate, reniform, oval and long triangle. Stipules are usually lanceolate. Nonglandular hairs may be unicellular or two-celled. Stomata are mainly anisocytic type. Petioles are mostly semicircle with two wings in transverse sections. Vascular bundles are three which are arranged in U-shaped or reniform. Aerenchyma and fibers are present in some species. The leaf shapes and structures differ in different species, but are similar in different Sect., and they can provide the morphological evidences for the classification of species and groups. This study also support the estimation of Subgen. Chamaemelanium, Subgen. Melanium and Sect. Viola, incorporating Sect. Pinnatae into Sect. Adnatae and Viola prionantha, V. phalacrocarpa and V. yedoensis as three independent species. Our study provid the basic data for further and deeply study of Viola of Chinese and Violaceae.

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