||A photomicrograph of a pollen grain from a plant in the goosefoot (Chenopodiaceae) family. Size of the grain is about 25 micrometers.
Most plants in this family are weedy and are especially common in prairies. Thus, this pollen type is indicative of prairie or steppe vegetation. It also becomes more abundant after European settlement and widespread soil disturbance that favors weedy plants.
Microscopic photograph of Chenopodium pollen grain by Dr. Eric Grimm
Illinois State Museum