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Yellow and Orange Wildflower Gallery

Tube Flowers - Evening Primrose Family

                       

Onagraceae - Evening Primrose family
Hartweg's Sundrops (Hartweg's Evening Primrose) Calylophus hartwegii
Locally called buttercup, flower is 2"-3" wide, fading to orange as it curls up. Flowers open late afternoon and fades as the next day gets hot. Narrow, corrugated pods, 1"-2" long, are called hypanthium, the floral tube with the ovary at its base. Leaves are highly variable, up to 1 1/2" long. These plants reach about 16" tall and are wider than tall. Some years this plant can cover fields.
Photos taken in Taylor County, Texas, April-May & July-August 2004, March 2006
(Native of Texas - Taylor, Callahan, Coleman, Brown, Coke, Nolan, Fisher)

Similar Species

Showy Evening Primrose Oenothera grandis
Petals are light yellow to golden and can be bicolor with with a darker yellow center. Sepals are joined and flare to one side of stem. Leaves are strongly lobed.
(Native of Texas - Taylor, etc)

  

Onagraceae - Evening Primrose family
Berlander's Sundrops (Square-bud Primrose) Calylophus berlandieri
Yellow flower. Buds have square crossection. Leaves are very long and narrow. Stem is upright with flower at top. Grows to 6" tall.
Photos taken in Callahan County, Texas, June 2010
(Native of Texas - Taylor, Nolan, Callahan, Coleman, Brown)

Similar Species

Yellow Sundrops (Dwarf Sundrops) Calylophus serrulatus
Yellow flower. Wide leaves.
(Native of Texas - Coleman, Brown, Coke)

     

Onagraceae - Evening Primrose family
Flutter-Mill (Missouri Primrose, Bigfruit Evening-Primrose) Oenothera macrocarpa
The name describes this flower well. It's petals flutter in a light breeze. Flower is 3-4" wide. Plant is 12-18" tall. Leaves are grayish and 4-5" long.
Photos taken in Taylor County, Texas, July 2002, April-July 2004
(Native of Texas - Taylor, Callahan, Coleman, Brown)

Similar Species

Howard's Evening Primrose Oenothera howardii
Yellow petals, flat at end. Rosette of long leaves, ground hugger. Leaves much smaller than flower.
(Native of Texas - Taylor, Coleman)

Stemless Evening Primrose Oenothera triloba
Smaller yellow flowers with green veins, sepals fused to one side of flower. Ground hugging rosette of leaves. Long sharp leaves, near base pinnate or sharply lobed.
(Native of Texas - Taylor, Callahan, Shackelford, Coleman, Brown, Coke, Nolan)

                 

Onagraceae - Evening Primrose family
Diamond Petal Primrose (Fourpoint Evening Primrose) Oenothera rhombipetala
Yellow flower. Sepals are connected an flare away from one side of stem. Long leaves on main stem below branching.
Photos taken in Callahan County, Texas, June 2010
(Native of Texas - Taylor, Callahan, Brown, Runnels, Coke, Fisher, Jones)

Similar Species

Common Evening Primrose (Evening Star) Oenothera biennis
Erect plant. Yellow flower petals have two prominent lobes. Sepals hug stem, not all connected. Flower is on a long stem with a ribbed base.
(Native of Texas - Coleman)

Variableleaf Evening Primrose Oenothera heterophylla
Erect plant. Yellow petals, wide with blunt pointed end.
(Native of Texas - Runnels)

Cutleaf Evening Primrose Oenothera laciniata
Erect plant. Small pale yellow petals are heart shaped, opens at night and closes with strong sun. Leaves have deep irregular sharp lobes.
(Native of Texas - Taylor, Callahan, Coleman, Coke)