Oenanthe lachenalii, parsley water-dropwort, is a flowering plant in the carrot family, which is native to Europe and parts of North Africa.In general, they should be easy to distinguish: parsley water-dropwort usually has bracts on the main umbels, the rays do not thicken after flowering, and the umblets do not become flat-topped in fruit.[1] The first description of parsley water-dropwort was by the German botanist Karl Christian Gmelin in his Flora Badensis Alsatica[4] in 1805.[1] The global range of parsley water-dropwort is in Western Europe as far as Poland and Greece, extending northwards to southern Scandinavia and southwards as far as the coast of Africa.In Britain, its ecological preferences are described as varying from the upper part of salt marshes, through brackish dykes to base-rich fen-meadows inland.[13] In the Aiguamolls de l'Empordà, in Spain, studies show that it occurs in a variety of habitats, from tall fescue/meadow barley meadows with wild celery, saltmarsh rush and narrow-leaved bird's-foot trefoil, to wetter water finger-grass/divided sedge grassland and through to brackish marsh with annual beard-grass, sea aster and Somerset rush.
A fresh umbel, showing the bracts
Lower leaf of parsley water-dropwort
The roots are slightly swollen but do not bear distinct tubers
The petioles barely clasp the strongly ribbed stem