Separate names with a comma.
This is a Trifolium sp., not a Bougainvillea...
Not easy without flowers... :(
Maybe a Ruellia sp.
Yes, Juglans mandshurica (or a similar Juglans sp., not easy without fruit... )
Pterocarya buds are different, check it in my bud-collection:...
Hm, I think Ron was right! It is really a Geum (macrophyllum?), beacause of the sharp edged sepals, etc.
Pull them out, then send them back to Europe! It's a quite rare and protected native species in my area... :)
Amelanchier alnifolia (?)
Weird fruits... but the whole plant looks like a Malvaceae. (Maybe Grewia, Malvaviscus or something similar...)
2 - Caltha palustris
3 - Ranunculus sp.
#2 Silene armeria
Ligustrum ovalifolium (?)
Looks like a Barleria cf. cristata with an unusual flower... (Barleria used to have 5 petals, while this one has only 4)
Looks like a Calotropis gigantea.
Looks like a Convolvulaceae, Convolvulus arvensis or a similar species...
Wow, maybe I should collect stamps and not botany books... :)
It is surely a Rubiaceae... Coptosperma sp. or an Ixora sp.?