 On the other hand, some plants have evolved to attract carrion flies. Their flowers tend to be pale or dark brown with a putrid smell and little or no nectar. Flies are tricked into landing on the plants and leave taking pollen with them. Pawpaw trees and skunk cabbage have such flowers. If you see an unfamiliar bee in your garden, it could possibly be a fly. This is Ann Holcomb with Nature in the Natural State.