Arnica latifolia

(Broadleaf Arnica)

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Arnica latifolia, North Swan River, Summit Co. 5108

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Arnica latifolia, Mayflower Gulch, Summit Co. 2621

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Arnica latifolia, Mayflower Gulch, Summit Co. 6902

Scientific Name Arnica latifolia USDA PLANTS Symbol ARLA8
Common Name Broadleaf Arnica ITIS Taxonomic Serial No. 36566
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (8800 to 13000 ft.); moist areas in forests, meadows and open areas.
Plant: Erect perennial 8 to 14 inches tall, slender, sticky stems.
Leaves: Opposite, lance-elliptic to ovate leaves 2 inches long; lower leaves with winged petioles; mid and upper leaves becoming sessile; margins serrate to dentate; 2 to 4 pairs per stem.
Inflorescence: Single or up to 3 flower heads, each 1 to 1-1/2 inches across with 8 to 16 ray flowers, many darker yellow disk flowers; hairy, pointed green and white phyllaries.
Bloom Period: July and August.
References: Notes from Jane Hendrix, Breckenridge, "Flora of Colorado" by Jennifer Ackerfield, SEINet and "Guide to Colorado Wildflowers" by G.K. Guennel.
Note: Similar to Heartleaf Arnica (Arnica cordifolia) except that lower leaf petioles are short, the leaves are not heart-shaped and it blooms in mid-August when most Heartleaf Arnica plants have gone to seed and their leaves are turning color.
BONAP Distribution Map


Map Color Key
Colorado Status:
Native

© Tom Lebsack 2022

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County