The Delicate Arch Viewpoint Road is closed. All other roads and trails remain open, but many trails are snowy, icy, and dangerous. Please inquire at the visitor center for the most up-to-date conditions.
Construction Update - 11/25/2013
Construction work continues at the Devils Garden parking lot, limiting parking and causing occasional delays. Visitors can avoid the area by turning around at Sand Dune Arch. More »
Bridges Evening-primrose (Tall Yellow Evening-primrose)
Family: Onagraceae (Evening-primrose Family)
Perennial or biennial herbs; stems 7.9” to 5.9' (2 to 18 dm) tall or more
Leaves: alternate and basal; simple; can be toothed; 0.8” to 14” (2 to 35 cm) long, 0.12” to 1.8” (0.3 to 4.5 cm) wide
Flowers: 4 yellow petals; 4 sepals; 8 stamens; 4 lobed stigma; bisexual; usually radially symmetrical; fragrant; 1” to 2” (2.5 to 5 cm) long
Pollinators: other Oenothera species are pollinated by bees, moths and butterflies
Fruits: 4 chambered capsule
Blooms in Arches National Park: April, May, June, July, August, September, October
Habitat in Arches National Park: disturbed areas, riparian areas and hanging garden communities
Location seen: lower and upper Courthouse wash
Other: The genus name, “Oenothera”, means “wine-scented” and refers to the use of the roots in winemaking. The species name, “longissima”, refers to the long corolla tube or hypanthium.
The type specimen was collected in 1911 in Natural Bridges National Monument in southeast Utah which is where one of the common names comes from.
Did You Know?
The dirt is alive! A living crust called "Biological Soil Crust" covers much of Arches and the surrounding area. Composed of algae, lichens and bacteria, this crust provides a secure foundation for desert plants. Please stay on roads and trails to avoid trampling this important resource. More...