Here is some basic information about Bidens bipinnata and a list of ethnobotanical uses which includes medicinal uses and other uses of Bidens bipinnata.
Bidens bipinnata basic info
Scientific Name: Bidens bipinnata L..
Common names in English: Spanish-needles.
Bidens bipinnata commonly called "Spanish Needles" is a common and widespread species of flowering plant, widely dispersed in many lands, so much so that it is difficult to ascertain with certainty its region of origin. It seems most likely, though, that it is is native to Asia and North America, and naturalized elsewhere. - for more info about Bidens bipinnata See link
Ethnobotanical and folk medicinal uses of Bidens bipinnata
*The information in this list is based on the ethnobotanical data in Dr. Duke's Phytochemical and Ethnobotanical Databases.
Dr. Duke does not recommend using this information for self diagnosis or self medication. - See link
Bidens bipinnata in other websites
Bidens bipinnata common names, economics importance, distributional range and more in the USDA GRIN website - See link
Search PubMed (US National Library of Medicine National Institutes of Health) for academic researches with the search term Bidens bipinnata - See link
See if there is something in Youtube on the term Bidens bipinnata - See link