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Wood sorrel growing from moss in a wooded valley

Wood sorrel growing from moss in a wooded valley by Tom Hibbert

Wood-sorrel

©Guy Edwardes/2020VISION

Wood sorrel

Enw gwyddonol: Oxalis acetosella
A delicate, small plant of woodlands and hedgerows, wood-sorrel has distinctive, trefoil leaves and white flowers with purple veins; both fold up at night.

Species information

Ystadegau

Height: up to 10cm

Statws cadwraethol

Common.

Pryd i'w gweld

April to May

Ynghylch

The fresh green, trefoil leaves of wood-sorrel form distinctive clumps in woodlands and shady hedgerows, often growing from the moss on fallen logs. Rising from these cushions, the delicate white flowers hang on tiny stems, blooming around Eastertime and giving rise to its popular European name of 'alleluia'.

Sut i'w hadnabod

Wood sorrel has distinctive trefoil leaves - at night, the three, heart-shaped lobes are folded back into a tent, while during the day, they flatten out. The white flowers have five petals and tiny purple veins, they also close as the light fades, reopening in the dappled sun.

Dosbarthiad

Widespread.

Test

Roeddech chi yn gwybod?

Certain plants are used as indicators of how old a woodland is, although these plants may differ from region to region, simply because habitats, soils and conditions change the flora present. Wood sorrel is used as an indicator of ancient woodlands mainly in Central and Southern England.