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Bransford, W.D. and Dolphia
Arnica cordifolia Hook.
Heart-leaf leopardbane, Heartleaf arnica
Synonym(s): Arnica cordifolia ssp. genuina, Arnica cordifolia var. humilis, Arnica cordifolia var. pumila, Arnica cordifolia var. whitneyi, Arnica hardinae, Arnica humilis, Arnica paniculata, Arnica whitneyi
USDA Symbol: arco9
This pubescent perennial with long-petioled, heart-shaped basal leaves bears a single, yellow, radiate flower atop a solitary, 8-20 in. stem . Plants are rhizomatous and form clumps to several feet across. The plant makes a tight-binding carpet of green leaves at ground level. Stems with 2-4 pairs of heart-shaped leaves are topped by 1-3 broad yellow heads.
In alpine areas or in open places along roads, the leaves may be narrower and without the notch at the base of the blade. All western species have paired leaves on the stems, but only this one has heart-shaped leaves.
Plant CharacteristicsDuration: Perennial Habit: Herb Root Type: Tap Leaf Complexity: Simple Leaf Shape: Cordate Leaf:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: May , Jun , Jul , Aug
, WY Canada: AB
, YT Native Distribution: AK
to the Black Hills, s. to CA
& NM; rare w. of the Cascades; also Keweenaw Co., MI Native Habitat:
Dry or moist, open or wooded places; 3500-10,000 ft.
Growing ConditionsWater Use: High
Light Requirement: Part Shade
Soil Moisture: Moist
CaCO3 Tolerance: Low
Soil Description: Various moist or dry soils.
Conditions Comments: Dwarfed plants, with stems only 4-8 in. high, are distributed with the species and are called var. pumila.
BenefitConspicuous Flowers: yes
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Native Seed Network
- Corvallis, OR
Record Last Modified: 2007-01-01
Research By: TWC Staff