Note that this website has been superseded by World Flora Online Retrieved 7 December 2014 – via The Plant List. World Checklist of Selected Plant Families. Agricultural Research Service, United States Department of Agriculture. The green plant parts can be cooked or eaten as a salad the taste is pleasant when harvested before flowers develop. In Europe plant has been reported to cause deaths of eurasian hummingbird hawk-moth as they get stuck into the flower while foraging. Within the United States Department of Agriculture's hardiness zone climates 4 to 9, and in most areas of Central Europe, the species should be sufficiently hardy. The pink evening primrose is used in the temperate latitudes as an ornamental plant, but does not survive severe winters. This drought-resistant plant prefers loose, fast-draining soil and full sun. While it makes an attractive garden plant, care should be taken with it as it can become invasive, spreading by runners and seeds. The plant's wild habitat includes rocky prairies, open woodlands, slopes, roadsides, meadows and disturbed areas. Originally native to the grasslands of Kansas, Missouri, Nebraska, northeastern New Mexico, Oklahoma, and Texas, it has been naturalized in 28 of the lower 48 United States as well as Chihuahua and Coahuila in Mexico. The species has the following varieties: This plant may be referred to as a buttercup, though it is not a true buttercup (genus Ranunculus), or even in the buttercup family. The specific name, speciosa, means "showy". The flowers are frequented by several insect species, but moths are the most common as the flowers are mostly open at night. They bloom from March to July, and occasionally in the fall. It blooms both day and night, but typically in the pre-dawn hours, closing when the full sun hits them. The flower throats, as well as the stigmas and stamens, have a soft yellow color. The 4–5 cm ( 1 + 1⁄ 2–2 in) flowers start out white and turn pink as they age. These fragrant shell-pink flowers bloom throughout the summer into early autumn. It produces single, four-petaled, cup-shaped flowers on the upper leaf axils. They are variable in shape, from linear to obovate, and are toothed or wavy-edged. The pubescent leaves are alternate with very short or no petiole (sessile), reaching 10 cm (4 in) long to 4 cm ( 1 + 1⁄ 2 in) broad. It has glabrous (smooth) to pubescent stems that grow to 50 centimetres (20 inches) in height. Oenothera speciosa is a herbaceous perennial wildflower. Oenothera speciosa is a species in the evening primrose family known by several common names, including pinkladies, pink evening primrose, showy evening primrose, Mexican primrose, and buttercups (not to be confused with true buttercups in the genus Ranunculus). Xylopleurum berlandieri Spach, syn of var.Hartmannia berlandieri (Spach) Rose, syn of var.
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