Description and General Information:
Once known as O. missouriensis, the Ozark or Missouri sundrops is native to Nebraska and Kansas, where is grows on limestone bluffs and rocky prairies. Plants have a sprawling habit and reach 15-30 cm high. The subspecies fremontii has narrow, elongate leaves with a silver shimmer. The solitary flowers are quite large for the size of the plant, measuring 7-10 cm in diameter, with four broad, yellow petals. Flowers last a single day, opening in late afternoon then fading the next morning. The blooming season ranges from May to September.
This species requires full sun and a well-drained site. It is...