Stock photography, photos: Bumblebee on Spotted Knapweed Stock photos of American Bumblebee on Spotted Knapweed Blossom Photograph: © Jerome Wilson Click for a larger image and more information Keywords associated with this stock photo: bumble, bee, Bombus pennsylvanicus, Centaurea maculosa, insect, pollen, pollinate, pollination, pollinator, wildflower, blossom, bloom, invasive, weed, bumblebee, nectar