Burke: Arnica cordifolia

	Arnica cordifolia
	heart-leaf arnica, heart-leaf leopardbane
Habit	Perennial from long rhizomes, 1-6 dm. tall, pubescent, stems solitary or a few clustered together.
Leaves	Long-petiolate, cordate basal leaves commonly on separate short shoots; cauline leaves 2-4 pairs, petiolate, reduced upward, the more or less cordate blade 4-12 cm. long and 3-9 cm. wide, usually toothed.
Flowers	Heads 1-3, rarely more, often single; involucre 13-20 mm. high, covered with long, spreading, white hairs, and usually glandular as well; rays 10-15, 1.5-3 cm. long, yellow; pappus white, barbellate.
Fruits	Achenes uniformly short-hairy or glandular or both.

	Arnica cordifolia
Identification notes	The similar Arnica latifolia has smaller and usually more heads, and the leaves and achenes are usually glabrous.
Flowering time	April-July
Habitat	Light forest understory, openings, and edge, from low elevations to the subalpine.
Distribution	Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, and the Great Lakes region. [WildflowerSearch map] [BONAP county map]
Origin	Native
Conservation status	Not of concern
Sibling taxa	A. chamissonis, A. discoidea, A. fulgens, A. gracilis, A. lanceolata, A. latifolia, A. longifolia, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Arnica cordifolia

heart-leaf arnica, heart-leaf leopardbane

Habit

Perennial from long rhizomes, 1-6 dm. tall, pubescent, stems solitary or a few clustered together.

Leaves

Long-petiolate, cordate basal leaves commonly on separate short shoots;

cauline leaves 2-4 pairs, petiolate, reduced upward, the more or less cordate blade 4-12 cm. long and 3-9 cm. wide, usually toothed.

Flowers

Heads 1-3, rarely more, often single;

involucre 13-20 mm. high, covered with long, spreading, white hairs, and usually glandular as well;

rays 10-15, 1.5-3 cm. long, yellow;

pappus white, barbellate.

Fruits

Achenes uniformly short-hairy or glandular or both.

Arnica cordifolia

Identification notes

The similar Arnica latifolia has smaller and usually more heads, and the leaves and achenes are usually glabrous.

Flowering time

April-July

Habitat

Light forest understory, openings, and edge, from low elevations to the subalpine.

Distribution

Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, and the Great Lakes region.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Sibling taxa