Bidens tripartita

Bidens tripartita is a common and widespread species of flowering plant in the sunflower family, Asteraceae, commonly known as three-lobe beggarticks, three-part beggarticks, leafy-bracted beggarticks or trifid bur-marigold. It is native to much of Eurasia, North Africa, and North America, with naturalized populations in Australia and on some Pacific Islands.

Distribution and abundance
Bidens tripartita is native to much of Eurasia, North Africa, and North America, with naturalized populations in Australia and on some Pacific Islands. Bidens tripartita is considered relatively rare in southwestern British Columbia and was likely introduced from eastern North America and Europe.

Morphology
Bidens tripartita is an annual species with rigid stems and fibrous roots. Leaves are often deeply lobed. Flower heads are discoid and lacking ray flowers. Fruits are achenes.

Subspecies and varieties

 * Bidens tripartita subsp. bullatus (L.) Rouy
 * Bidens tripartita var. repens (D.Don) Sherff
 * Bidens tripartita subsp. tripartita
 * Bidens tripartita var. tripartita