|Scientific Name||Arnica parryi||USDA PLANTS Symbol||ARPA13|
|Common Name||Rayless Arnica, Parry's Arnica, Nodding Arnica||ITIS Taxonomic Serial No.||36574|
|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
© Tom Lebsack 2022
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County