AoB PLANTSNews in Brief Achene heteromorphism in Bidens pilosa (Asteraceae): differences in germination and possible adaptive significance Bidens pilosa L. (also known as cobbler’s pegs, farmer’s friend and burr marigold) is a noxious weed in many ecosystems worldwide. Across China, the plant can be found growing on roadsides and in fields and villages at... William SalterJune 25, 2019