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Hartweg's sundrops
Scientific Name: Calylophus hartwegii ssp. fendleri
Family: Onagraceae
Category: Dicot
Growth: Subshrub, Forb/herb
Duration: Perennial
Other Names:
Calylophus hartwegii
Calylophus hartwegii, also known as Hartweg's sundrops or Western Primrose, is a flowering plant 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 (implied through mentions of older classifications)
- Subspecies:
- Calylophus hartwegii subsp. hartwegii
- Calylophus hartwegii subsp. pubescens (A. Gray) Towner & P.H. Raven
- Calylophus hartwegii fendleri
Distribution and Habitat
Hartweg's sundrops is native to the southwestern United States and parts of northern Mexico, including:
- Kansas
- Oklahoma
- Colorado
- Arizona
- New Mexico
- Texas
- Northern Mexico
It thrives in hot, dry areas with full sun to part shade, and tolerates various soil types including clay, sandy, and caliche.
Morphological Characteristics and Growth Habits
- It is described as a somewhat upright, perennial groundcover.
- The plant has narrow, green to gray-green foliage.
- Flowers are cup-shaped, bright to lemon yellow, approximately 1 inch in size.
- The flowers may fade to orange as they age.
- Stems can be decumbent or slightly ascending, usually branched.
Quirky Facts
- The flowers open at dusk and close during the day.
- The plant has modified leaves (sepals) right below the petals, which have a keel near the tip.
- Hartweg's sundrops bloom from June through August.
Further Information
- Monrovia's Hartweg's Sundrops: Monrovia plants
- Encyclopedia of Life: Encyclopedia of Life
- Native Plant Information Network (NPIN)
- United States Department of Agriculture (USDA)