dooryard knotweed

Polygonum aviculare

Polygonaceae

Slideshow and species account to come.

For more information:

https://gobotany.nativeplanttrust.org/species/polygonum/aviculare/

https://www.illinoiswildflowers.info/weeds/plants/pros_knotweed.htm

https://www.luontoportti.com/suomi/en/kukkakasvit/knotgrass

http://naeb.brit.org/uses/search/?string=polygonum+aviculare

http://www.naturalmedicinalherbs.net/herbs/p/polygonum-aviculare=knotweed.php

https://en.wikipedia.org/wiki/Polygonum_aviculare