Is <I>Ptarmica</I> independent genus or attached to <I>Achillea ptarmica</I>, tribe Anthemideae, Asteraceae?
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概要
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<I>Ptarmica impatiens</I> L.(diploid; 2n=18), <I>P. ledebouri</I> (Heimerl.) Serg.(tetraploid; 2n=36) and <I>P. salicifolia</I> (Bess.) Serg. (tetraploid; 2n=36) taxonomically close relatives with and are sometimes placed in the genus <I>Achillea</I> grown commonly in the well northern colder region. The karyotypic comparison showed <I>Ptarmica</I> is somewhat different from <I>Achillea</I> although they were placed in the tribe Anthemideae, the family Asteraceae. <I>Ptarmica</I> should be independent genus separated from <I>Achillea</I> and more meritorious in an ornamental and horticultural purposes.
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