Burke: Arnica lanceolata vs. Arnica latifolia

	Arnica lanceolata	Arnica latifolia
	clasping arnica, stream bank arnica	broad-leaved arnica, mountain arnica, daffodil leopardbane
Habit	Perennial from a freely-rooting rhizome, 3-8 dm. tall, more or less glandular and hairy.	Perennial, 1-6 dm. tall, glandular at least above.
Leaves	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.	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.
Flowers	Heads several; involucre 9-15 mm. high, its bracts sharply pointed; rays 8-14, pale yellow, 1-2 cm. long; pappus tawny, sub-plumose.	Heads 1-several; involucre 7-18 mm. high, more or less glandular; pappus white, barbellate.
Fruits	Achenes sparsely hirsute and sometimes glandular.	Achenes glabrous, at least toward the base.

	Arnica lanceolata	Arnica latifolia
Identification notes		The similar Arnica cordifolia has larger heads, frequently solitary; its leaves and achenes are pubescent.
Flowering time	June-August	June-August
Habitat	Streambanks, moist woods and meadows from middle elevations to the subalpine.	Common in forest openings and meadows, and open, rocky areas from middle to high elevations in the mountains.
Distribution	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]	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains. [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. latifolia, 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. lanceolata, 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, 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	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 latifolia

clasping arnica, stream bank arnica

broad-leaved arnica, mountain arnica, daffodil leopardbane

Habit

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

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

Leaves

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.

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.

Flowers

Heads several;

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

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

pappus tawny, sub-plumose.

Heads 1-several;

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

pappus white, barbellate.

Fruits

Achenes sparsely hirsute and sometimes glandular.

Achenes glabrous, at least toward the base.

Arnica lanceolata

Arnica latifolia

Identification notes

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

Flowering time

June-August

Habitat

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

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

Distribution

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]