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Location: Vienna, Austria

Leaf size: two big thumbnails

Plant height: large thumb enter image description here

I assumed it might have come from the seeds of some fruit I ate. I consulted these websites:

https://www.baumkunde.de/baumbestimmung/

http://www.blattbestimmung.de/blattform-herzfoermig

but found nothing. Perhaps it is neither shrub nor tree.

Edit: This is how it looks now, ten days later: enter image description here

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Seedlings are often tricky to determine, but I think this may be the common weed Chenopodium album (from the family Amaranthaceae). This is common across Europe, and the leaf shape, growth pattern and the silverly underside seen on the top leaf in your picture fits well.

Here are pictures of a seeding and a larger plant:

enter image description here
(from flickr.com)

enter image description here
(from https://plants.ces.ncsu.edu)

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  • 1
    $\begingroup$ I totally agree on Chenopodium, however, members of this group are extremly hard to distuingish, so maybe you should just settle with the family? $\endgroup$ – user32173 May 29 '18 at 17:25
  • $\begingroup$ @blabbath Where you write "settle with the family", are you referring to the actual family (Amaranthaceae) or the genus (Chenopodium). In general, I agree though, which is also why I phased it as "may be". It could well be another species in the genus, even though C. album is most common in many parts of Europe. $\endgroup$ – fileunderwater May 29 '18 at 18:08
  • $\begingroup$ The genus of course, my fault. But I can live with your answer as it is =) $\endgroup$ – user32173 May 29 '18 at 18:48

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