Arnica rydbergii

(Subalpine Arnica)

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Arnica rydbergii, Yankee Boy Basin, Ouray Co. 3370

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Arnica rydbergii, Mayflower Gulch, Summit Co. 4665

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Arnica rydbergii, Loveland Pass, Clear Creek Co. 1892

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Arnica rydbergii, Mayflower Gulch, Summit Co. 4695

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Arnica rydbergii, Yankee Boy Basin, Ouray Co. 3376

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Lower leaf, Arnica rydbergii, Yankee Boy Basin, Ouray Co. 3382

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Stem leaves, Arnica rydbergii, Mayflower Gulch, Summit Co. 4673

Scientific Name Arnica rydbergii USDA PLANTS Symbol ARRY
Common Name Subalpine Arnica ITIS Taxonomic Serial No. 36575
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (10000 to 13500 ft.); meadows and rocky areas.
Plant: Erect perennial, somewhat tufted, 2 to 12 inches tall; sticky stems with short hairs.
Leaves: Stem leaves in 2 to 4 widely-spaced pairs, opposite, oblanceolate to lanceolate; petiolate below, sessile above, and may have denticulate margins; basal leaves oblanceolate to spatulate clustered and usually petiolate; surfaces slightly hairy below, moderately pubescent further up the stem.
Inflorescence: Flower heads, 1 to 3 per plant, with 6 to 10 yellow ray flowers, many yellow disk flowers; involucre with hairy, pointed phyllaries with dark reddish tips.
Bloom Period: July and August.
References: "The Alpine Flora of the Rocky Mountains" by Richard W. Scott, "Flora of Colorado" by Jennifer Ackerfield, SEINet, and SW Coloado Wildflowers.
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