Solidago altissima - Solidago altissima

A perennial plant of the Asteraceae family. The stem is erect and can reach a height of 2-3 meters. Runnels sprout from the base of the stem in all directions, and new seedlings are produced at the tips of these, so it is easy to form large colonies. In October and November, it produces many yellow flower heads in a large panicle. A naturalized plant native to North America, it often forms large colonies on riverbanks and wastelands adjacent to urban areas. It has been said to be a plant that causes pollen allergies, but since this species is not wind-pollinated and pollen does not float in the air, it is unlikely that it causes pollen allergies. S. gigantea Ait. var. leiophylla Fernald, which has almost no hairs on its stems and leaves, looks very similar to S. gigantea, but it flowers earlier, from July to September.

[Hiroyuki Koyama]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

キク科の多年草。茎は直立し、高さ2～3メートルになる。茎の基部から四方へ走出枝を出し、その先に新苗をつくるので容易に大きな群落となる。10～11月、多数の黄色の頭花を大きな円錐(えんすい)花序につける。北アメリカ原産の帰化植物で、都会地に接した川原の土手や荒れ地にしばしば大きな群落をつくる。花粉アレルギーをおこす植物と騒がれたが、本種は風媒花ではなく、花粉が空気中を漂うことはないので、花粉アレルギーをおこすとは考えにくい。茎や葉にほとんど毛のないオオアワダチソウS. gigantea Ait. var. leiophylla Fernaldはセイタカアワダチソウによく似るが、花期が7～9月と早い。

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