SafePlants

Arnica longifolia: Seep-Spring Arnica

Arnica longifolia, a member of the sunflower family (Asteraceae), is a North American species of arnica known by several common names.

Common Names:

• Seep-Spring Arnica
• Longleaf Arnica
• Spearleaf Arnica
• Seep Arnica
• Long Leaf Arnica

Taxonomy and Nomenclature:

• Scientific Name: Arnica longifolia D. Eaton
• Family: Asteraceae (Aster or Sunflower family)
• Genus: Arnica
• Synonyms/Subspecies:
  • Arnica lonchophylla Greene subsp. arnoglossa (Greene) Maguire (synonym from Integrated Taxonomic Information System (ITIS))
  • Arnica lonchophylla Greene (Accepted Name for Arnica lonchophylla ssp. arnoglossa)

Distribution and Habitat:

• Native to California and found in the western and southwestern USA.
• Grows in rocky soil in seeps or springs, cliffs, or riverbanks, typically at moderate to high elevations.

Morphological Characteristics and Growth Habits:

• Perennial herb that develops like a shrub, forming a round-shaped clump.
• Stems are erect and often form large patches.
• Blooming stems are sticky in the upper part.
• Has shorter leafy side shoots.
• Leaves are mostly located on the stem.
• Typically has 8-13 petals and 5-7 pairs of long leaves.

Quirky Facts:

• A specimen of Arnica longifolia was found along the South Loop Road near where snow persists late into the summer, about a mile downhill from the East Rim.

Interactions with Other Organisms:

• The Northern Checkerspot butterfly has been observed on Arnica longifolia.

Traditional Use:

• Arnica is known for its medicinal qualities, particularly for speeding up wound and bruise recovery. It is used topically in ointments and gels.

Further Information:

• TERMIUM: Government of Canada's terminology and linguistic data bank.
• Integrated Taxonomic Information System (ITIS)
• United States Department of Agriculture