Corydalis cava, commonly known as hollowroot, is a spring-flowering perennial wildflower native to central and southern Europe. It is distinguished by its large, hollow underground tuber, a feature reflected in the species name cava, meaning “hollow.” In early spring, it produces elegant spikes of purple, pink, or white tubular flowers above finely divided foliage. Unlike many woodland plants, Corydalis cava appears briefly before tree canopies close, then disappears completely by early summer, making it a classic spring ephemeral of ancient deciduous forests.