Bidens heterosperma
Bidens heterosperma, commonly known as the Rocky Mountain beggarticks, is an annual or perennial, herbaceous, flowering plant in the family Asteraceae, tribe Coreopsideae. It is native to northwestern and north-central Mexico, and portions of the southwestern United States.
Description
Bidens heterosperma is an annual or perennial, herbaceous, flowering plant that grows between tall. The leaves are opposite, and are attached to petioles that are between 0.3 and 2 cm long; The leaf blades are once or twice pinnately divided, the terminal lobe is linear or filiform and is between 0.2 and 2.5 cm long by 0.5 to 2 cm wide; the leaves sometimes have small, hair-like protrusions on the margins; It usually produces flower heads one at a time on peduncles 1–10 cm long in groups of 5–6. The involucres are cylindric. There are 5–6 lanceolate to lance-elliptic phyllaries. There are 0–3 ray florets with yellow petals, and 5–13 disk florets with yellow corollas.The plant flowers from September to October.