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What is the 3m tall plant with white flower? It is from Central Europe and there is a creek near to it. I have a guess, but I want to know for sure...

the big plant

Is the small one the same species?

small plant

More high res photos here:

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  • $\begingroup$ Probably Angelica sylvestris. (No time to look more closely now) $\endgroup$
    – RHA
    Aug 11, 2018 at 7:38
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    $\begingroup$ The small one looks like Ground Elder (Aegopodium podagraria)... Were the leaves serrated? $\endgroup$
    – JulPal
    Aug 11, 2018 at 11:22
  • $\begingroup$ @JulPal I think so. But they looked like the big plant, which was 2.5m tall... $\endgroup$
    – inf3rno
    Aug 11, 2018 at 14:45
  • $\begingroup$ The photos are high res, but out of focus and motion blurred so it is really hard to identify accurately. $\endgroup$
    – James
    Apr 28, 2021 at 13:50

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They both look like poison hemlock (Conium maculatum). It can grow up to 3m tall and grows in moist areas including along creekbeds. One of it's common names is European Hemlock. It is toxic to some domestic animals and humans.

enter image description here

Source: United States Department of Agriculture

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Source: http://natureid.blogspot.com/2011/11/poison-hemlock-111211-elkhorn-slough.html

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    $\begingroup$ According to wiki it can grow only 2m tall. I checked other photos, the flowers are smaller and not that dense. I thought first it is en.wikipedia.org/wiki/Heracleum_mantegazzianum but the leaves are different. It is in the en.wikipedia.org/wiki/Apiaceae family and I suspect I had phototoxicity from it on my leg, but I am not sure. It might be unrelated. $\endgroup$
    – inf3rno
    Aug 11, 2018 at 0:11
  • $\begingroup$ The closest I could find based on the leaves is Angelica atropurpurea . No idea what it does in Europe though, it should be in America. :D $\endgroup$
    – inf3rno
    Aug 11, 2018 at 0:23
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    $\begingroup$ @inf3rno if you had touched H. mantegazzianum, you would have known, trust me. I slightly touched it with the rear of my knees and after a couple of hours I couldn't bend them without almost screaming in pain. It is not a pain you cannot be sure of. $\endgroup$ Aug 11, 2018 at 11:02
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    $\begingroup$ @inf3rno: Huh, according to the USDA it can grow to 3m tall - maybe that's just in the US. I'm glad it wasn't Giant Hogweed (H. mantegazzianum). I've never touched it as LinuxBlanket has but we were given a flyer at work earlier this year warning us about it $\endgroup$ Aug 11, 2018 at 14:30
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    $\begingroup$ @Linuxblanket Reaction to H. mantaggazianum varies greatly between people and depends strongly on exposure to the sun. $\endgroup$
    – RHA
    Aug 11, 2018 at 20:19

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