66. WHITE EVENING-PRIMROSEEvening-primrose Family
Oenothera caespitosa
This member of the Evening-primrose Family, with its fragrant, large white flowers, bloom early in the evening and lasts only a few hours the next day, as it turns pink and wilts.
The flowers grow close to the ground on stemless plants. They have long, slender and hairy calyx tubes that resemble stems. This plant is found mostly in very rocky and dry habitats, which are often devoid of all other plants.
White Evening-primrose
67. YELLOW EVENING-PRIMROSEEvening-primrose Family
Oenothera strigosa
You will find this plant most commonly in the road cuts or in places where the soil has been disturbed. This species and other members of this family have very showy flowers with four broad, thin petals. Generally they bloom at night but sometimes in the daytime if growing in deep shade.
The Evening-primroses are among the comparatively few flowers blooming in Zion Canyon during the heat of midsummer, and many of them are usually found on sandy or rocky soil in the Upper Sonoran Zone.
Yellow Evening-primrose