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R. Imaichi and M. Kato, “Speciation and Morphological Evolution in Rheophytes,” In: K. Iwatsuki and P. H. Raven, Eds., Evolution and Diversification of Landplants, Springer-Verlag, Tokyo, 1997, pp. 309-318.

has been cited by the following article:

• TITLE: Comparative Study of Leaf Morphology in Aster hispidus Thunb. var. leptocladus (Makino) Okuyama (Asteraceae)

  AUTHORS: Hiroshi Hayakawa, Tunala, Yukio Minamiya, Katsura Ito, Stephan Gale, Jun Yokoyama, Ryo Arakawa, Tatsuya Fukuda

  KEYWORDS: Anatomical Analysis; Aster hispidus var. leptocladus; Cell Number; Minitualization; Serpentine; Stenophyllization

  JOURNAL NAME: American Journal of Plant Sciences, Vol.3 No.1, December 31, 2011

  ABSTRACT: The comparative morphology and anatomy of leaves in the serpentine endemic Aster hispidus Thunb. var. leptocladus (Makino) Okuyama and its close relative A. hispidus var. hispidus were examined. Our morphological analysis revealed that the leaves of A. hispidus var. leptocladus were significantly smaller and narrower than those of A. hispidus var. hispidus. In particular, our anatomical analysis indicated that a decreased cell number of the horizontal axis of a leaf was involved in A. hispidus var. leptocladus. This was the same process as the changing pattern of the leaves of rheophytic species, and so, similar morphological leaf modifications occurred under different selection pressures of the serpentine soil and flooding frequency of river-stream.