Bidens cernua L.

Bidens cernua plant

Family - Asteraceae

Stems - No info. yet.

Bidens cernua stem

Leaves - No info. yet.

Inflorescence - No info. yet.

Involucre -No info. yet.

Bidens cernua involucreInvolucre.

Ray flowers - No info. yet.

Disk flowers - No info. yet.

Bidens cernua flowers

Flowering - August - October.

Habitat - Wet soils, streambanks, ponds, sloughs, ditches, railroads.

Origin - Native to U.S.

Other info. - This species can be found scattered throughout Missouri. It is an easy species to identify in the field because of its opposite leaves, which are connate at the base, its habitat, and its large, nodding flowerheads. The species epithet "cernua" means "nodding."
Steyermark broke the species up into three varieties based on leaf morphology. I wont go into these here as the taxa are probably no longer valid.

Photographs taken along the shores of the Current River, Shannon County, MO., 9-20-03.