Burke: Arnica latifolia vs. Arnica lanceolata

	Arnica latifolia	Arnica lanceolata
	broad-leaved arnica, mountain arnica, daffodil leopardbane	clasping arnica, stream bank arnica
Habit	Perennial, 1-6 dm. tall, glandular at least above.	Perennial from a freely-rooting rhizome, 3-8 dm. tall, more or less glandular and hairy.
Leaves	Broad, long-petiolate basal leaves sometimes on short separate stalks; cauline leaves 2-4 pairs, lance-elliptic or broader, rarely cordate, more or less toothed, 2-14 cm. long and 1-8 cm. wide, the middle ones larger than the lower.	Cauline leaves 5-12 pairs, not much reduced upward, narrowly lance-elliptic or lance-ovate, sessile, more or less toothed, 5-12 cm. long and 1.2-6 cm. wide.
Flowers	Heads 1-several; involucre 7-18 mm. high, more or less glandular; pappus white, barbellate.	Heads several; involucre 9-15 mm. high, its bracts sharply pointed; rays 8-14, pale yellow, 1-2 cm. long; pappus tawny, sub-plumose.
Fruits	Achenes glabrous, at least toward the base.	Achenes sparsely hirsute and sometimes glandular.

	Arnica latifolia	Arnica lanceolata
Identification notes	The similar Arnica cordifolia has larger heads, frequently solitary; its leaves and achenes are pubescent.
Flowering time	June-August	June-August
Habitat	Common in forest openings and meadows, and open, rocky areas from middle to high elevations in the mountains.	Streambanks, moist woods and meadows from middle elevations to the subalpine.
Distribution	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains. [WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains and the northeastern region; Alaska to California, east to the Rocky Mountains, also in northeastern North America. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	A. chamissonis, A. cordifolia, A. discoidea, A. fulgens, A. gracilis, A. lanceolata, A. longifolia, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia	A. chamissonis, A. cordifolia, A. discoidea, A. fulgens, A. gracilis, A. latifolia, A. longifolia, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia
Subordinate taxa		A. lanceolata ssp. prima
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	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Arnica lanceolata

broad-leaved arnica, mountain arnica, daffodil leopardbane

clasping arnica, stream bank arnica

Habit

Perennial, 1-6 dm. tall, glandular at least above.

Perennial from a freely-rooting rhizome, 3-8 dm. tall, more or less glandular and hairy.

Leaves

Broad, long-petiolate basal leaves sometimes on short separate stalks; cauline leaves 2-4 pairs, lance-elliptic or broader, rarely cordate, more or less toothed, 2-14 cm. long and 1-8 cm. wide, the middle ones larger than the lower.

Cauline leaves 5-12 pairs, not much reduced upward, narrowly lance-elliptic or lance-ovate, sessile, more or less toothed, 5-12 cm. long and 1.2-6 cm. wide.

Flowers

Heads 1-several;

involucre 7-18 mm. high, more or less glandular;

pappus white, barbellate.

Heads several;

involucre 9-15 mm. high, its bracts sharply pointed;

rays 8-14, pale yellow, 1-2 cm. long;

pappus tawny, sub-plumose.

Fruits

Achenes glabrous, at least toward the base.

Achenes sparsely hirsute and sometimes glandular.

Arnica latifolia

Arnica lanceolata

Identification notes

The similar Arnica cordifolia has larger heads, frequently solitary; its leaves and achenes are pubescent.

Flowering time

June-August

Habitat

Common in forest openings and meadows, and open, rocky areas from middle to high elevations in the mountains.

Streambanks, moist woods and meadows from middle elevations to the subalpine.

Distribution

Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.

[WildflowerSearch map]

[BONAP county map]

Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains and the northeastern region; Alaska to California, east to the Rocky Mountains, also in northeastern North America.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Sibling taxa