Arnica species

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Hairy Arnica (Arnica mollis)

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Scientific Name Arnica cordifolia USDA PLANTS Symbol ARCO9
Common Name Heartleaf Arnica ITIS Taxonomic Serial No. 36561
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine (6000 to 12000 ft.); moist, shady woodlands and streamsides.
Plant: Erect single-stem perennial 3 to 24 inches tall.
Leaves: Opposite, petiolate, heart-shaped velvety leaves up to 4 inches long with dentate margins, 2 to 4 pairs per stem.
Inflorescence: Large flower heads (2 to 3 inches across), usually 1 to 3 per plant, with 6 to 13 ray flowers, many yellow disk flowers, hairy phyllaries.
Bloom Period: June to September.
References: "Guide to Colorado Wildflowers" by G.K. Guennel and "Flora of Colorado" by Jennifer Ackerfield.
BONAP Distribution Map
Colorado Status:
Native
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.
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.
References: Notes from Jane Hendrix, Breckenridge, "Flora of Colorado" by Jennifer Ackerfield, SEINet and "Guide to Colorado Wildflowers" by G.K. Guennel.
BONAP Distribution Map
Colorado Status:
Native
Scientific Name Arnica mollis USDA PLANTS Symbol ARMO4
Common Name Hairy Arnica ITIS Taxonomic Serial No. 36571
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills to alpine (7500 to 13300 ft.); moist areas in meadows, near streams and rocky slopes.
Plant: Erect, clump-forming perennial 6 to 24 inches tall, minutely hairy, glandular stems, single or sometimes branched near heads.
Leaves: Opposite, large (1-1/2 to 7-1/2 inches long), ovate to lanceolate or oblanceolate leaves, soft, hairy and sticky; margins entire or irregularly denticulate, 2 to 4 pairs per stem.
Inflorescence: Flower heads, 1 to 3 per plant, 2 inches across with 10 to 22 ray flowers, many yellow disk flowers in a hemispherical disk; hairy, usually broadly lanceolate pointed phyllaries.
Bloom Period: July to September.
References: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel and Flora of North America.
BONAP Distribution Map
Colorado Status:
Native
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
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 www.swcoloradowildflowers.com.
BONAP Distribution Map
Colorado Status:
Native

© Tom Lebsack 2021