Yellow Sundrops Part Shade From spring to late summer

From spring to late summer

The unique acorn cups are adorned with a mossy scale or bur near the rim

After the first round of flowers fade

Erythrina × bidwillii

Yellow Sundrops Part Shade From spring to late summerCalylophus serrulatus Common names include Yellow Sundrops, Yellow Evening Primrose, Shrubby Evening Primrose, Toothed Evening Primrose, Serrate leaved Primrose, Plains Yellow Primrose and Plains Evening Primrose. Calylophus serrulatus is a native plant found in dry prairies and mesas in western North America, particularly in the Great Plains from Canada to Texas. It is a low, shrubby, woody based perennial, typically growing from 6 to 18 inches tall.