Stock photography, photos: Purple Coneflowers in Winter Prairi Stock photos of Purple coneflowers in the Bluestem Prairie during winter. Photograph: © Matthew Thalman Click for a larger image and more information Keywords associated with this stock photo: America, Bluestem Prairie, Coneflower, Echinacea purpurea, ecology, ecosystem, environment, environmentalism, flower, grassland, habitat, land, landscape, Minnesota, nature, North America, perennial, plantlife, plants, prairie, Purple Coneflower, scenery, scenic, Scientific & Natural Area, Scientific & Natural Areas, season, SNA, United States of America, US, USA, Winter, winter solstice