Chromosome characters of two varieties of Ellisiophyllum pinnatum (Scrophulariaceae)
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概要
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Chromosome characters of <I>Ellisiophyllum pinnatum</I> var. <I>typicum</I> (=var. <I>pinnatum</I>) and <I>E. pinnatum</I> var. <I>reptans</I>, were studied. These two varieties had common characters of the resting, mitotic prophase and metaphase chromosomes; complex chromocenter types of the resting chromosomes, interstitial types of the mitotic prophase chromosomes, and the chromosome number of 2n=18 at mitotic metaphase. This species could be diploid if the basic chromosome number x=9 was accepted. The common chromosome number of 2n=18 for the two taxa was reported here for the first time. Their karyotypes were commonly mono-modal decrease in length from the longest to the shortest chromosomes. <I>Ellisiophyllum pinnatum</I> var. <I>reptans</I> had slightly larger chromosomes than <I>E. pinnatum</I> var. <I>typicum</I> had. The chromosome complement in centromeric positions of <I>E. pinnatum</I> var. <I>typicum</I> was m+sm and that of <I>E. pinnatum</I> var. <I>reptans</I> was m+sm+st.
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