silphium perfoliatum. yellow flowers of the cup plant.

plant flower yellow wildflower produce herb meadow shrub prairie blossom food field nature leaf petal grass green silphium perfoliatum flowers cup close agriculture alternative asteraceae background biomass bloom blooming botanical closeup colorful ecology energy crop farming flora flowering butterflies garden herbaceous nectar papilio glaucus silage perfoliate summer sunflower towering wild wildflowers blossoms butterfly