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The harlequinbush (Oenothera hexandra) belongs to Onagraceae (the Evening primrose family). It is an annual herb that is native to Arizona, New Mexico and western Texas in the United States. This herb grows in canyons, woodlands, along streams, disturbed ground, and can reach up to 90 cm in height. The stems are slender, covered by white hairs and the leaves grow mostly at the base. The leaves are oblanceolate and have much smaller hairs along their edges. The flowers bloom at the top of the stems from April to October. The four petals are pale pink, later darkening, and narrow, held at varying angles, sometimes rolled up or recurved. The eight stamens and one pistil project forwards. The stamens have white or pink filaments and purple anthers.
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