Oenothera harringtonii

Oenothera harringtonii is a species of flowering plant in the evening primrose family known by the common names Arkansas Valley evening primrose and Colorado Springs evening primrose. It is endemic to the state of Colorado in the United States. It is named for the botanist Harold Harrington. This species is part of the Oenothera caespitosa species complex. It is an annual, biennial, or short-lived perennial herb. It produces one or more stems from a basal rosette of leaves and a thick taproot. The stems reach up to 40 centimeters tall and are yellowish with reddish spots. The hairy leaves are roughly lance-shaped and have toothed edges. They are green with a yellowish or red-purple tinge and measure up to 14.5 centimeters in length. The plant bears 5 to 10 flowers at a time on each stem. The strongly fragrant flowers have petals up to 2.6 centimeters long which are white, fading pink. The fruit is a knobby capsule up to 3.5 centimeters long and 8 millimeters wide. It contains up to 100......read more on Wikipedia.