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:

  • $\begingroup$ Probably Angelica sylvestris. (No time to look more closely now) $\endgroup$ – RHA Aug 11 '18 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 '18 at 11:22
  • $\begingroup$ @JulPal I think so. But they looked like the big plant, which was 2.5m tall... $\endgroup$ – inf3rno Aug 11 '18 at 14:45

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.

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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 '18 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 '18 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. $\endgroup$ – LinuxBlanket Aug 11 '18 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 $\endgroup$ – wanderweeer Aug 11 '18 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 '18 at 20:19

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