These are fertile shoots of field horsetail (Equisetum arvense). I didn't expect them to grow in such a busy place close to a waste collection site. (You can see blue plastic bags piled up in the 1st photo.) I've seen fertile shoots of field horsetails many times but only in the field.
They also made me realize that I didn't know what they were at all, i.e., that they're shoots; that they're reproductive stems; and that they're surrounded by their green relatives, i.e., sterile shoots. Such ignorance, however, may not be necessarily all my fault. In Japan, a fertile shoot of field horsetail is called tsukushi, considered (by many) as a different plant from field horsetail, which is called sugina. There's even a children's song in Japan entitled "Whose child is a fertile shoot? It's field horsetail's."
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| 2025/4/9 |
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| 2025/4/9 |
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土筆がスギナの胞子茎だってご存じでしたか！？私、全く知りませんでした。土筆は土筆だと思っておりました。。。いやはや、土筆がこんな都会のごみ捨て場の横でも元気に育つことにも驚きましたが、土筆はスギナだったなんて。でも知らない人も多いのでは？だって「つくし誰の子、スギナの子」という歌があるぐらいですから。（この歌のことも初めて知りました。）
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