Kerria
What are they?
Just one species is known in the genus Kerria, a member of the rose family (Rosaceae) which is widely grown as a garden ornamental but has no other, closely-related species.
Where are they found?
Kerria is a common plant in cultivation, so is most likely to be found in shrub borders in amenity areas or where discarded on rough ground as a garden throw-out.
Identification
This species is relatively easy to identify, with its combination of greenish, suckering stems and either single (five-petalled) or fully double, yellow flowers.
Kerria Kerria japonica
Introduced from eastern Asia as a garden ornamental. Popular as a garden and amenity plant and occasionally found in the wider countryside as a garden throw-out or survivor from an earlier planting. Flowers May to June. A many-stemmed bush, the stems green and often suckering up from the base. May grow up to 3m in height, but typically seen around 2m. Flowers rather like buttercups, but more often seen in the double-flowered form, with pompoms of yellow that earn it the name 'Batchelor's Buttons' (a name used for a wide range of plants with similarly rounded flowers). Leaves tough when mature, with deeply impressed veins.
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