Bidens laevis - (Linnaeus) Britton, Sterns & Poggenburg
Asteraceae (Composite Sunflower) Family
The leaves are alternate on the stem, one whole part, stalked, usually arising in two ranks (pinately dissected) along the stem with lance-like segments. Leaf margins may be toothed or lobed. The leaves are shiny and smooth to the touch..
The flowers are solitary on long stems. The ray flowers are female only, symmetrical in form and bisexual in nature. The color is yellow and numbers 8 to 10 rays per head. Disc flowers a brown or purple and also bisexual in nature.
Fruit is achene.
The related species, B. frondosa, does not have ray flowers, but the sepals and bracts are long, extending outward giving the appearance of rays or petals, B. pilosa has white ray flowers.