This is a sticker set that I made up for a summer work crew.  The set features a number of invasive species that we encountered this summer.  Clockwise:  Common Buckthorn rhamnus cathartica, Japanese Barberry berberis thunbergii, Multiflora Rose rosa multiflora, Common Malaria Mosquito anopheles quadrimaculatus.

Also. one final sticker made for a blog:  www.pintproblems.com