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.