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Hartweg's sundrops

Scientific Name: Calylophus hartwegii ssp. filifolius

Family: Onagraceae

Category: Dicot

Growth: Subshrub, Forb/herb

Duration: Perennial

Other Names:

       

Calylophus hartwegii

Also known as Hartweg's Sundrops, Western Primrose, and Fendler Evening Primrose, Calylophus hartwegii is a captivating wildflower belonging to the Evening-Primrose Family.

Taxonomy and Nomenclature

  • Scientific Name: Calylophus hartwegii (Benth.) P.H. Raven
  • Family: Onagraceae (Evening-Primrose Family)
  • Synonyms: Oenothera hartwegii, Oenothera hartwegii var. typica Munz
  • Subspecies:
    • Calylophus hartwegii subsp. hartwegii
    • Calylophus hartwegii subsp. pubescens (A. Gray) Towner & P.H. Raven
    • Calylophus hartwegii fendleri

Distribution and Habitat

  • Native to Kansas, Oklahoma, Colorado, Arizona, New Mexico, and Texas, as well as parts of Northern Mexico.
  • Thrives in hot and dry areas.
  • Tolerant of clay, sandy, and caliche soils.

Morphological Characteristics

  • Upright, bushy plant with narrow green to gray-green foliage.
  • Cup-shaped flowers, typically bright to lemon yellow, approximately 1 inch in diameter. The color fades to orange as the flower matures.
  • Stems are decumbent or slightly ascending, branched.

Ecological Role

  • Attracts wildlife.

Additional Information

  • Blooms from June through August.
  • Flowers often open at dusk and close during the day.

Further Resources

  • Encyclopedia of Life
  • Monrovia Plants
  • NPIN (Native Plant Information Network)
  • United States Department of Agriculture