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This small plant with tiny yellow flowers is collected in South-Central Europe. Found in a field.

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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.

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It appears to be Wood Sorrel (Oxalis acetosella) the seed pods are a favorite nibble of my chickens. A minor potherb and in small amounts, it is edible for humans as well.

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    Oxalis, yes, acetosella certainly not: the plant in question has yellow flowers while wood sorrel has white petals with sometimes a purple tinge. And “in a field” is also untypical for wood sorrel, which prefers the dappled shade of forests. – Stephie Feb 8 '18 at 6:58
  • I agree, certainly not O. acetosella but rather O. dillenii (Southern Wood Sorrel) as Giacomo answered. – herb guy Feb 9 '18 at 13:34

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