Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Hi Myriam,
When you type Bidens into the search bar you get a list of pertinent results in no particular order, like searching the web with Google. Near the top of the page you will see the link Click here to view all plants in the genus: bidens. http://garden.org/plants/searc...
Select that and Bootjack (Bidens) is at the top of the list.
