Family: Asteraceae
Scientific Name: Bidens frondosa 
Common Name: Beggar Ticks, Stick Tights, Bur Marigold, Pitch Fork Weed
Description:
Brush up against the ripe flower of this plant and dozens of hook like seeds will attach.
plant type:
Weeds
Hardiness zone:
Sunlight:
Moisture:
mosit to average
Soil & Site:
prefers moist areas
Media:
Temperature:
Flowers:
Flowers: a composite head, two ray flowers not always present and a centeral brown disk or female disk flowers. Fruit: flat, black, wedge shaped achene, two points on the apex with down pointing hooks. Has 8-5 outward spreading green bracts.
Foliage:
Leaves: compound, 3-5 leaflets, opposite, two simple, lanceolate leaves found below the terminal bud. Stems: 4 angles, flutes, smooth, take on a purplish ting and freely branching.
Dimensions:
2-5 feet
Maintenance:
Propagation:
seeds
Origin & History:
Since it is found naturally growing along streams the roots are eaten by Muskrats and seeds by Ducks (Missouri Wild Flowers web site)
Notes & Reference:
Photos: