Anemones! AKA Windflowers
Since these flowers get blown by the wind, they are called windflowers... in Greek, "wind" is "anemone."
With their large petals catching the wind, they are often representing "fleeting love" or "fading hope" and similar heart-wrenching ideas in the language of flowers. In Greek mythology, Adonis bleed because he was secretly in love with Aphrodite... and from his blood, bloomed anemone, hence creating the origin from its heart-wrenching image. Even the colors can represent other themes: red means "I love you," white means "hopeful reality," purple means "I believe you and will wait for you," etc. Check out these illustrations of anemone!