Naturalized Artemisia iwayomogi (Compositae) in Sado Island, Niigata, Japan

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  • 佐渡島におけるイワヨモギ(キク科)の帰化
  • サドガシマ ニ オケル イワヨモギ キクカ ノ キカ

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We found an invasion of an endangered species, Artemisia iwayomogi, in Sado Island, Niigata prefecture, Japan. The site is located along the "Jigokudani line" forest rood, at the edge of a planted pine forest. Many studies pointed out the naturalization of this species with greening of roadside slopes. In many case, the A. iwayomogi was introduced from foreign countries. Natural A. iwayomogi grows in an herb community on seaside cliffs in Hokkaido Island, In Sado Island, there was no natural distribution of A. iwayomogi, but we found some herb communities on seaside cliffs in Sado Island like Hokkaido. Then we are afraid of an invasion of A. iwayomogi to the natural herb community on seaside cliffs. The herb communities in Hokkaido and Sado islands are very similar with species composition. "The plants of Sado Island (Homma 2002)", which is a complete flora in Sado Island, didn't include the distribution of A. iwayomogi, and then we report the invasion of the species.

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