Allium, ornamental onion.
Blooms late spring to early summer. Hardy in USDA Zones 4-8, depending on variety.
Camassia, cama.
Blooms late spring. Hardy in USDA Zones 4-8.
Chionodoxa, glory of the snow.
Blooms late winter, early spring. Hardy in USDA Zones 4-8.
Colchicum, autumn crocus.
Blooms late summer and fall. Hardy in USDA Zones 4-8, depending on variety.
Crocus tommasinianus, Tommy crocus.
Blooms late winter, early spring. Hardy in USDA Zones 4-8.
Eranthis, winter aconite.
Blooms late winter, early spring. Hardy in USDA Zones 4-7.
Fritillaria, lily family.
Blooms mid to late spring, depending on variety. Hardy in USDA Zones 4-8.
Galanthus nivalis, snowdrop.
Blooms late winter, early spring. Hardy in USDA Zones 4-8.
Hyacinthoides hispanica, Spanish bluebell.
Blooms late spring. Hardy in USDA Zones 4-10.
Hyacinthus, hyacinth.
Blooms mid spring. Hardy in USDA Zones 4-8.
Ipheion, springstar.
Blooms early to late spring, depending on variety. Hardy in USDA Zones 4-9.
Leucojum, snowflake.
Blooms mid to late spring. Hardy in USDA Zones 4-8. (There is also a fall-blooming Leucojum autumnale, hardy in Zones 5-9.)
Muscari, grape hyacinth.
Blooms mid to late spring, depending on variety. Hardy in USDA Zones 4-9.
Narcissus, daffodil.
Blooms early to late spring, depending upon variety. Hardy in USDA Zones 4-11, depending upon variety.
Ornithogalum, star-of-Bethlehem.
Blooms early to mid spring. Hardy in USDA Zones 5-8.
Oxalis, woodsorrel.
Blooms mid spring to fall, depending on variety. Hardy in USDA Zones 7-10, depending on variety.
Scilla, squill.
Blooms early spring to early summer, depending upon variety. Hardy in USDA Zones 4-10, depending on variety.