There are no significant taxonomic issues associated with this name.

European regional assessment: Least Concern (LC)
EU 27 regional assessment: Least Concern (LC)
 
This species is classed as Least Concern as it is widespread with stable populations and does not face any major threats.

B. cernua occurs throughout much of the Northern Hemisphere, from Scandinavia to the Mediterranean and east through Siberia, Mongolia, the Caucasus and the Himalayas to eastern Siberia, China and Japan. It also occurs throughout much of North America except the extreme north and Arctic. In Europe, it occurs in southern Scandinavia, the Baltic States, throughout central Europe to southern France, northern Italy and the Balkans to European Turkey.

B. cernua appears to be widespread and abundant with stable populations throughout most of its European range except in the extreme north, while it is listed as Endangered in Switzerland.

B. cernua grows in nutrient-rich mud on the margins of most water body types, from rivers and streams to lakes, ponds and wet hollows in grassland, as well as ditches and canals.

There are no known past, ongoing or future threats to this species.

Bidens cernua is used medicinally to treat urinary-tract infections.

B. cernua is classed as Endangered in Switzerland and Vulnerable in Norway and Austria; no other conservation measures in place or needed.