Taxonomic studies of Polygonum thunbergii s. lat. (Polygonaceae)(3): Relationship between two types previously recognized in Seto population, Aichi Prefecture

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  • ミゾソバ(タデ科)の分類学的再検討 (3): 愛知県瀬戸の集団で区別された2 型の関係
  • ミゾソバ タデカ ノ ブンルイガクテキ サイケントウ 3 アイチケン セト ノ シュウダン デ クベツサレタ 2ガタ ノ カンケイ

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Abstract

In order to clarify the relationship between the two types of Polygonum thunbergii s. lat.（type and type of Hanai et al. 2004）sympatrically found in Seto population, three topologically different populations（Dando, Sasagata, Kuroda）were studied in Mt. Dando-san, Aichi Prefecture. The populations in Dando and Kuroda were characterized by relatively narrow range of variation in morphology and flowering season. The plants of these populations were referable to the types and , respectively. The population in Sasagata, however, was quite variable in these aspects ; it included the plants of the types , , and their intermediates. Such variation was supposed to be a result of hybridization caused by recent disturbance. Namely, the two types were considered to be usually isolated from each other, but often hybridize in the sympatric habitats caused by disturbance. Additional field observations in six populations of western Honshu and Kyushu supported this consideration.

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