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; moist, shady areas.
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.
References: Descr. adapted from "Guide to Colorado Wildflowers" by G.K. Guennel and "Flora of Colorado" by Jennifer Ackerfield.
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: Subalpine; moist, shady 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.
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: Descr. from Jane Hendrix and adapted from SEINet and "Guide to Colorado Wildflowers" by G.K. Guennel.
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: Subalpine and alpine; near streams and moist areas.
Plant: Erect perennial 6 to 24 inches tall, hairy, sticky stems.
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, 3 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; pointed phyllaries.
References: Descr. adapted from "Guide to Colorado Wildflowers" by G.K. Guennel and "Flora of Colorado" by Jennifer Ackerfield..
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; 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 and short, purple-tinged phyllaries.
References: Descr. adapted from "Guide to Colorado Wildflowers" by G.K. Guennel, "Flora of Colorado" by Jennifer Ackerfield, SEINet, and Jepson eFlora.
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: Subalpine and alpine; 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, with slightly serrate margins; basal leaves oblanceolate to spatulate clustered and usually petiolate.
Inflorescence: Flower heads, 1 to 3 per plant, with 6 to 10 yellow ray flowers, many yellow disk flowers and short, pointed phyllaries with red tips.
References: Descr. adapted from "The Alpine Flora of the Rocky Mountains" by Richard W. Scott, "Flora of Colorado" by Jennifer Ackerfield, SEINet, and www.swcoloradowildflowers.com.
Colorado Status
Native

© Tom Lebsack 2018