Bidens cernua
Species of flowering plant in the daisy family Asteraceae
From Wikipedia, the free encyclopedia
Bidens cernua is a species of flowering plant in the aster family, Asteraceae.[4][5][6][7] It is commonly called nodding beggarticks[8] or nodding bur-marigold. Bidens cernua is distributed throughout much of Eurasia and North America.[4][5][6][7][9]
| Bidens cernua | |
|---|---|
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Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Bidens |
| Species: | B. cernua |
| Binomial name | |
| Bidens cernua | |
| Synonyms[1][2][3] | |
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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 with saw-toothed to almost smooth margins.[10]
It has yellow flowers with 6-8 ray narrowly lance shaped petals around a central disk. The hemispheric heads are solitary at the ends of branches and nod with age.[10]
The achenes are narrowly wedge-shaped and 4-sided, flattened and ribbed. The pappus has 3-4 barbed bristles.[10]