Water Dropwort?

Water Dropwort?

Observation - Water Dropwort? - UK and Ireland. Description: Plant found growing in small plant pot which contains parsley bought from a supermarket. Flowers tiny (1-2mm) looks like 5 even-sized white petals and 5 stamens. Compound umbel with thin bracts and bracteoles (not present on all umbels). Plant approx. 30c

Plant found growing in small plant pot which contains parsley bought from a supermarket. Flowers tiny (1-2mm) looks like 5 even-sized white petals and 5 stamens. Compound umbel with thin bracts and bracteoles (not present on all umbels). Plant approx. 30cm tall, stem leaves long stalked and linear, 2cm long and narrow. Basal leaves shrivelled but leaflets look roughly triangular and pointed. Stem ridged.