Like most members of this genus, the flowers of oenothera deltoides
are large, up to three inches in diameter, composed of four thin, white, papery petals, yellow at the base, centered on a cluster of yellow stamens and a longer tube holding the four-pronged ovary. Leaves grow in a rosette around the base, on stems which branch in older plants and can become several feet long.
Flowers are relatively short lasting, and open late in the day. The leaf stems of dead plants curve upwards and come together at the tips to form a basket-like structure, which accounts for one of the common names of this species. Flowers take on a pinkish tint as they age. Leaves may have entire edges, or be pinnately divided into irregular lobes. There are five recognized varieties.