日本国内のホウキギク類（Ａｓｔｅｒ属Ｏｘｙｔｒｉｐｏｌｉｕｍ節）の分類と帰化動態，種間雑種に関する研究

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  • Taxonomy, status of naturalization and hybrids of Aster subulatus complex in Japan.
  • ニホンコクナイ ノ ホウキギクルイ Asterゾク Oxytripoliumセツ ノ ブンルイ ト キカ ドウタイ シュカン ザッシュ ニ カンスル ケンキュウ

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We examined two hundred and twenty five specimens of naturalized Oxytripolium deposited in nine herbaria, TNS, TI, MAK, KPM, KYO, OSA, WAKAYAMA, KURA and RIB in Japan. We identified three taxa, 1) Aster subulatus Michx. var. subulatus, 2) Aster subulatus Michx. var. sandwicensis A. G. Jones, 3) Aster subulatus Michx. var. elongatus Bosserdet. (Japanese common name is Houkigiku, Hiroha-houkigiku, Oo-houkigiku, respectively). Chromosome number of Aster subulatus Michx. was 2n=20 (tetraploid), that of Aster subulatus Michx. var. sandwicensis A. G. Jones, 2n=10 (diploid), and that of Aster subulatus Michx. var. elongatus Bosserdet, 2n=20 (tetraploid). Basic chromosome number X=5 was different from that of other Japanese Aster species with X=9.<br>A natural hybrid between Aster subulatus Michx. and Aster subulatus Michx. var. sandwicensis A. G. Jones was detected in Okayama Prefecture, and it was designated as Murasaki-houkigiku (in Japanese). Hybrid plants between Aster subulatus Michx. and Aster subulatus Michx. var. sandwicensis A. G. Jones could be obtained. Their morphological characters were similar to those of the natural hybrid. The chromosome number of the hybrid was 2n=15. The hybrids produced infertile achenes because they were triploid.<br>A natural hybrid between Aster subulatus Michx. var. sandwicensis A. G. Jones and Aster subulatus Michx. var. elongatus Bosserdet was found in Chiba Prefecture, and it was designated as Osozaki-houkigiku (in Japanese). Hybrid plants between Aster subulatus Michx. var. sandwicensis A. G. Jones and Aster subulatus Michx. var. elongatus Bosserdet could be obtained. Their characters were similar to those of the natural hybrid.

収録刊行物

  • 雑草研究

    雑草研究 46 (3), 185-193, 2001

    日本雑草学会

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