yellow star thistle centaurea solstitialis blooming on the shoreline of south san francisco bay, sunnyvale, california

america area background bay beautiful beauty bloom blooming blurred botanical botany bright california centaurea cheerful ecology field flora floral flower francisco golden green herb inflorescence invasive joy joyful meadow nature plant pollen pollination prickly san shoreline solstitialis south spring star summer sunnyvale texture thistle thorns usa vibrant vivid weed wild wildflower yellow