Centaurea cyanus, the cornflower.
Scottish bluebell (harebell) (Campanula rotundifolia)
Spanish bluebell (Hyacinthoides hispanica)
desert bluebell or California bluebell (Phacelia campanularia)
common bluebell (Hyacinthoides non-scripta)
genus Muscari, the grape hyacinth)
Australian royal bluebell (Wahlenbergia gloriosa)
Italian bluebell (Hyacinthoides italica)
Texas bluebell (Eustoma russellianum)
Virginia bluebell (Mertensia virginica)