Oenothera macrocarpa

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Oenothera macrocarpa (syn. Oenothera missouriensis), the bigfruit evening primrose, Ozark sundrops, Missouri evening primrose, or Missouri primrose, is a species of flowering plant in the evening primrose family Onagraceae, native to northeast Mexico and the south-central United States, where it is found in calcareous prairies and limestone outcrops. This herbaceous perennial produces a red stem up to 46 cm (18 in) in height. The plant can sprawl along the ground up to 0.6 m (2 ft). Leaves are long and narrow, about 15 cm (6 in) long by 3 cm (1 in) across, and are densely crowded in an alternate arrangement along the stem. They have either smooth margins or broadly spaced teeth and are hairy. The large flowers, up to 13 cm (5 in) across, are cup shaped with four petals, canary yellow, and have a mild fragrance. They are produced in great numbers from early to mid summer. The flowers last for one day, opening in the evening and closing the following morning. Each flower has a very long floral tube 10–11 cm (3.9–4.3 in) in length, The seed pods are 4-winged and 52–75 mm (2–3 in) long.