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Yes, "mimosa" is a common name for several plants, including Albizia julibrissin (mimosa tree)
I think "Mimosa" is sometimes a confusing name because it is also a plant genus with 400 species
and it is sometimes used for Acacia species with yellow flowers e.g.
Anyway, it's easy to add multiple common names to a spotting (spotter's option).
Since the photo is from Madrid, it seems appropriate to guess that is could be
Bromus madritensis (subspecies rubens), but it's difficult to ID grasses from photos.
The first picture is Stachytarpheta cayennensis. The flowers in the second picture are Erigeron karvinskianus. You'll need to make a separate posting for each species and their corresponding photo so that you can fill in the IDs.