If seeking medical advice take along a twig from the tree. Pea-sized dark purple berries, perhaps less strong than the previous with which it may be confused. Polygonum hydropiper Not poisonous but hotter than chilli. Tear a leaf and chew a tiny bit. Don't swallow unless you want to discover why an alternative common name for this plant is 'arse smart'.
Children suck clover flowers for nectar which seems to be harmless.
Red clover is a 'herb' promoted for health. Found occasionally on roadside banks or escaped from gardens. Small tree frequently planted on woodland edges, parkland and escaped into waste ground. Yellow hanging candles of pea-shaped flowers followed by small green pods which drop onto footpaths. A green small shrub in woodland resembling the garden Daphne but with green flowers.