yellow flowers of oenothera biennis common evening-primrose, evening star, sundrop on a meadow on a cloudy summer morning

background beautiful beauty biennial biennis bloom blooming blossom botany bright bud close cloudy color common evening eveningprimrose fading field flora floral flower flowers forest fresh garden green herb herbal landscape leaf meadow medicinal morning natural nature oenothera outdoor overcast petal plant primrose rubricaulis star stem summer tree wild wildflower wilting yellow