Arnica parryi

(Rayless Arnica)

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Arnica parryi, Mayflower Gulch, Summit Co. 8371

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Arnica parryi, County Line Trail, Grand Mesa NF, Delta Co. 0466

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Arnica parryi, Loveland Pass, Clear Creek Co. 6831

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Arnica parryi, Mayflower Gulch, Summit Co. 8383

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Arnica parryi, County Line Trail, Grand Mesa NF, Delta Co. 0472

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Leaves, Arnica parryi, Mayflower Gulch, Summit Co. 8377

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Arnica parryi, County Line Trail, Grand Mesa NF, Delta Co. 0454

Scientific Name Arnica parryi USDA PLANTS Symbol ARPA13
Common Name Rayless Arnica, Parry's Arnica, Nodding Arnica ITIS Taxonomic Serial No. 36574
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (8000 to 12500 ft.); moist meadows, open forests and groves.
Plant: Erect perennial 18 to 24 inches tall, hairy stems.
Leaves: Stem leaves opposite, up to 4 pairs per stem, 1-1/2 to 7-1/2 inches long, lanceolate with hairy edges; lower leaves petiolate, upper leaves sessile; basal leaves (if present) shorter, ovate, and sessile.
Inflorescence: Bell-shaped flower heads, 3 to 9 per plant, 3/4-inch long with no ray flowers; many dark yellow disk flowers; involcre is bell shaped and the green, narrowly-lanceolate or linear phyllaries with soft, glandular hairs.
Bloom Period: July to September.
References: "Guide to Colorado Wildflowers" by G.K. Guennel, "Flora of Colorado" by Jennifer Ackerfield, SEINet, American Southwest and Jepson eFlora.
BONAP Distribution Map

Colorado Status:
Native

© Tom Lebsack 2022

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