About the Lilies

​ The Cahaba lily (Hymenocallis coronaria) is an aquatic flowering plant native to the major river systems of Alabama, Georgia, and South Carolina. A type of spiderlily belonging to the amaryllis family, the Cahaba lily is noted for the striking beauty of its three-inch-wide white flowers. 

The lily requires a very specialized habitat—swift-flowing water over rocks and lots of sun—and thus is restricted to shoal areas at or above the fall line. In Alabama, the Cahaba lily is restricted to the Black Warrior, Cahaba, Coosa, Tallapoosa, and Chattahoochee river systems. 

Plant bulbs and seeds spend the winter buried in the rocky riverbed. There the water's current securely wedges the seeds and bulbs into the rock crevices. Leaves begin to emerge above the water line in mid-April, following the spring floods (dates are approximately two weeks later in eastern Georgia and South Carolina). 

Flower stalks develop after the leaves are fully emerged, with each stalk capped by six to nine buds surrounded by protective casings called bracts. Flowering commences in mid-May, reaching its peak in late May and early June, with sporadic flowering until late June.

https://encyclopediaofalabama.org/article/cahaba-lily/