Chlidanthus is a small genus in the Amaryllidaceae family mainly from South America. DNA sequencing has found that it is a member of the Eustephieae tribe, sister to Eustephia, Hieronymiella, and Pyrolirion. Only one of the species is widely grown. Most of the species have narrow basal leaves and an umbel of funnel-shaped to flat yellow, pink, or red flowers.
Chlidanthus fragrans is a species native to the Peruvian Andes. It is one of the most fragrant bulbous flowers, with a scent of citrus. It blooms in late spring or early summer. It has a reputation as a shy bloomer to many who have grown it. The first two photos were taken by Osmani Baullosa. Photos 3 and 4 were taken by Hans Joschko who has trouble getting it to bloom reliably, but finds the flowers really nice when they do bloom. His pictures show the long tube.