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Hartweg's sundrops
Scientific Name: Calylophus hartwegii ssp. pubescens
Family: Onagraceae
Category: Dicot
Growth: Subshrub, Forb/herb
Duration: Perennial
Other Names:
Calylophus hartwegii: Hartweg's Sundrops
Calylophus hartwegii, also known as Hartweg's sundrops or Western Primrose, is a captivating plant with bright yellow flowers that add a touch of sunshine to its native landscapes.
Taxonomy and Nomenclature
- Scientific Name: Calylophus hartwegii (Benth.) P.H. Raven
- Family: Onagraceae (Evening-Primrose Family)
- Synonyms: Oenothera hartwegii
- 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 a range of regions, including:
- Kansas
- Oklahoma
- Colorado
- Arizona
- New Mexico
- Texas
- Parts of Northern Mexico
It thrives in hot, dry areas and is drought-tolerant, making it well-suited to clay, sandy, and caliche soils.
Morphological Characteristics
- It exhibits an upright, bushy growth habit.
- The plant has narrow, green to gray-green foliage.
- It features cup-shaped flowers, typically 1 inch in size, with colors ranging from bright yellow to lemon yellow. The color can fade to orange as the flowers age.
- Stems can be decumbent or slightly ascending, usually branched.
- The flowers bloom from June through August and open at dusk.
Interactions with Other Organisms
- The plant attracts wildlife.
Quirky Facts
- The flowers, which are 2"-3" wide, are locally called buttercups.
- The plant has modified leaves (sepals) right below the petals, which have a "keel" near the tip.