Description
Synonyms: O. macrocarpa | Missouri Evening Primrose A tap-rooted perennial with low plants bearing 3-5 inch, yellow flowers. Blooms from mid-June through August, day-blooming. Found across Missouri and Kansas, south to Texas; dry, thin, rocky, exposed calcareous soils on prairies, cliffs, hillsides, slopes. Best in full to partial sun, dry soils, prefers a soil with good drainage; does not tolerate combination of heat and humidity.