This small plant with tiny yellow flowers is collected in South-Central Europe. Found in a field.
For me it is Oxalis dillenii, a North-American species which is invading Europe.
Some info in French (or German): https://www.infoflora.ch/fr/flore/oxalis-dillenii.html#info . So it doesn't have stolons, but still long stems.
These yellow flowering Oxalis likes dry and sunny places (O. corniculata is a European species, but it is smaller, and less flowers). Most of them are weeds that likes "forgotten" pots.