You may refer to this flower as the Amaryllis. Bulbs in pots, usually sold at the holiday times as "ready to bloom", are actually Hippeastrums. They are native to tropical and sub tropical regions of the Americas from Argentina north to Mexico and the Caribbean.
The spectacular bloom, approximately 8" across, requires very little care in Texas gardens.
Looking at the bloom from the back, it has a trumpet-like shape.
While other flowers are preparing to bloom for the summer, the Amaryllis gives my garden a burst of color in the early Spring.
Meggie Mac