Separate names with a comma.
Phenakospermum guyannense
Besleria vestita ? https://fieldguides.fieldmuseum.org/sites/default/files/rapid-color-guides-pdfs/976_colombia_gesneriaceae.pdf
Lichen, Cladonia sp.
This is a Trifolium sp., not a Bougainvillea...
Lactuca sp.
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
Astroloba congesta
Ligustrum ovalifolium (?)
Calathea marantifolia
Looks like a Barleria cf. cristata with an unusual flower... (Barleria used to have 5 petals, while this one has only 4)
Rhamnus cathartica
Anchusa officinalis
Looks like a Calotropis gigantea.