SafePlants

White Marsh Marigold (Caltha leptosepala)

The White Marsh Marigold, scientifically known as Caltha leptosepala, is a captivating flowering plant belonging to the buttercup family (Ranunculaceae). It's a delightful sight in its native habitats, bringing a touch of pristine beauty to wet mountain landscapes.

Common Names

• White Marsh Marigold
• Twinflowered Marsh Marigold
• Broadleaved Marsh Marigold
• Elkslip
• Elkslip Marsh Marigold
• Mountain Marsh Marigold

Taxonomy and Nomenclature

• Scientific Name: Caltha leptosepala
• Family: Ranunculaceae (Buttercup family)
• Synonyms/Variations:
  • Caltha leptosepala ssp. leptosepala var. leptosepala
  • Caltha palustris var. alba
  • Caltha leptosepala ssp. howellii
  • Caltha leptosepala var. biflora
  • Caltha biflora

Distribution and Habitat

• Native to western North America.
• Ranges from Alaska to New Mexico.
• Grows in wet mountain habitats.
• Found in alpine and subalpine regions.

Morphological Characteristics

• Glossy, basal leaves are distinctly longer than broad with wavy edges.
• Showy flowers that bloom in spring (April-May) and sometimes again in late summer (August).
• Height: Typically 20-30cm (approximately 8-12 inches).
• Stems are often buried with leaves arising directly from the soil.

Interactions with Other Organisms

• Observed to interact with Hippodamia convergens (convergent ladybeetle).

Quirky Facts

• One of the earliest harbingers of spring in the Rocky Mountain West.
• Can be found blooming at the edge of snow, even poking through shallow snow caves.
• While typically white, a yellow-flowered form is also available.

Further Information

• Additional information available from the RHS (Royal Horticultural Society) on Caltha palustris var. alba.