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Hartweg's Sundrops (Calylophus hartwegii): Yellow Evening Primrose Relative

Overview

Hartweg's sundrops (Calylophus hartwegii) is a low, spreading perennial native to the south-central US and Mexico. It produces masses of bright yellow, four-petaled flowers that open in the evening and last through the next day.

Botanical Details

Family: Onagraceae (on-uh-GRAY-see-ee)
Genus: Calylophus (kal-ee-LOW-fus)
Species: hartwegii (hart-WEG-ee-eye)
Synonym:Calylophus hartwegii subsp. hartwegii

Garden Uses

Excellent for hot, dry sites, rock gardens, and borders. Long bloom season (spring to fall). Drought-tolerant. Attracts night-flying moths and daytime pollinators.

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