Bidens amplissima, also known as the Vancouver Island beggarticks, is a wetland annual species in the sunflower family, Asteraceae that is listed as Special Concern in Canada and has a limited global range.

Leaves are coarsely toothed along the margin, often widest at the base and becoming narrow toward the tip and the petiole, when present, is often winged-margined.

[4][5][7] Many botanists have misidentified these unlobed individuals as the common species B. cernua, which is widespread across most of North America and Europe.

Bidens amplissima often occurs in sites where waterfowl are common, and shows a distinct preference for silty alluvial soils.

[2][3][4][5][10] Bidens cernua has yellow rays, achenes are wedge-shaped with retrorsed barbed awns, and simple unlobed leaves that are often roughly the same width along the entire length and lack a petiole.

[3][4] In contrast, B. tripartita is characterized by small rayless heads, achenes are wedge-shaped with retrorsed barbed awns, and leaves that are tripartite.

Given that most of its geographic range is in southwestern British Columbia, conservation and management within the province is crucial to the longevity of the species.