''Bidens cernua'' is a species of flowering plant in the aster family,

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

. ''Bidens cernua'' is distributed throughout much of

Eurasia Eurasia ( , ) is a continental area on Earth, comprising all of Europe and Asia. According to some geographers, Physical geography, physiographically, Eurasia is a single supercontinent. The concept of Europe and Asia as distinct continents d ...

and

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

.Flora of North America, ''Bidens cernua'' Linnaeus, Sp. Pl. 2: 832. 1753.
/ref>Flora of China, 柳叶鬼针草 liu ye gui zhen cao, ''Bidens cernua'' Linnaeus, Sp. Pl. 2: 832. 1753
/ref>Biota of North America Program 2014 county distribution map
/ref>Altervista Flora Italiana, Forbicina intera, ''Bidens cernua'' L.
includes photos and European distribution map It is commonly called nodding beggarticks or nodding bur-marigold.

Distribution and abundance

''Bidens cernua'' is distributed throughout much of

and

Morphology

General description

''Bidens cernua'' is an annual species growing roughly 1m tall, with a fibrous root. Stems are rigid and often either simple or beached. Stem leaves are simple, unstalked, and opposite.

References

{{Taxonbar, from=Q27501 cernua Flora of Asia Flora of Northern America Flora of Europe Plants described in 1753 Taxa named by Carl Linnaeus