Yellow Evening Primrose (3)

Oenothera elata

Hooker's Evening Primrose
Oenothera elata (O. hookeri)

Family: Evening Primrose (Onagreaceae)
AKA: Western Evening Primrose, Tall Evening Primrose
Photo taken on: July 10, 2005
Location: Almont, CO
Life Zones: Foothills and montane
Habitat: Disturbed moist areas, roadsides

Plant grows to 3ft tall. Flowers showy, up to 3" across. Leaves are grayish and woolly. Flowers open late in the day and close the next morning, turning orange.

Oenothera flava

Yellow Evening Primrose
Oenothera flava

Family: Evening Primrose (Onagreaceae)
AKA: Golden Evening Primrose
Photo taken on: June 19, 2007
Location: Almont, CO
Life Zones: Foothills to montane
Habitat: Dry meadows and roadsides

Low growing plant with no stem. Leaves are long, narrow and toothed. Flowers are up to 2" across.

Oenothera longissima

Longstem Evening Primrose
Oenothera longissima

Family: Evening Primrose (Onagreaceae)
AKA: Bridges Evening Primrose
Photo taken on: August 13, 2012
Location: Abiquiu, NM
Life Zones: Plains and foothills
Habitat: Moist areas, ditches, washes

Grows to 6ft tall with a single erect stem and willow-like leaves. The flowers are large and showy with a very long flower tube, 4-6", which distinguishes it from O. elata. O. elata also is branched and does not grow as tall as O. longissima.

Yellow Single Flowers