blue cornflower centaurea cyanus on a white background. poster

blue cornflower centaurea cyanus white background poster agave montana alpine annual antiinflammatory antiseptic aster bachelor bloom botany boutonniere flower button bachelors centaureas centauri cineraria curative segetum field fiordaliso flora foliage garden green herb isolated macro meadow medical mountain narrowleaved natural nature perennial petal plant postcards prickly purple senecio summer useful wallpaper wild wildflower