Burke: Arnica lanceolata vs. Arnica chamissonis

	Arnica lanceolata	Arnica chamissonis
	clasping arnica, stream bank arnica	leafy arnica, meadow arnica, narrowleaf arnica, silvery arnica, leafy leapordbane
Habit	Perennial from a freely-rooting rhizome, 3-8 dm. tall, more or less glandular and hairy.	Perennial from long, naked rhizomes; stems solitary, 2-10 dm. tall; herbage variously pubescent, becoming glandular 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.	Leaves opposite, sessile, 5-10 pairs, only slightly reduced upward; leaves lanceolate to oblanceolate, entire or slightly toothed, 5-30 cm. long and 1-4 cm. wide.
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 several, the involucre 8-12 mm. high, the herbaceous bracts sub-equal, usually obtuse, with a tuft of long, white hairs; ray flowers pale yellow, usually 13, pistillate, 1.5-2 cm. long; disk flowers yellow, perfect; pappus somewhat tawny, barbellate.
Fruits	Achenes sparsely hirsute and sometimes glandular.	Achene with short hairs, somewhat glandular.

	Arnica lanceolata	Arnica chamissonis
Flowering time	June-August	June-September
Habitat	Streambanks, moist woods and meadows from middle elevations to the subalpine.	Meadows and wet places from middle elevations to the subalpine.
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 both sides of the Cascades, including the northeastern corner of Washington; Alaska to California, east to the Rocky Mountains, east across Canada to the Atlantic Coast. [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. cordifolia, A. discoidea, A. fulgens, A. gracilis, A. lanceolata, 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, 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 chamissonis

clasping arnica, stream bank arnica

leafy arnica, meadow arnica, narrowleaf arnica, silvery arnica, leafy leapordbane

Habit

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

Perennial from long, naked rhizomes; stems solitary, 2-10 dm. tall; herbage variously pubescent, becoming glandular 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.

Leaves opposite, sessile, 5-10 pairs, only slightly reduced upward;

leaves lanceolate to oblanceolate, entire or slightly toothed, 5-30 cm. long and 1-4 cm. wide.

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 several, the involucre 8-12 mm. high, the herbaceous bracts sub-equal, usually obtuse, with a tuft of long, white hairs;

ray flowers pale yellow, usually 13, pistillate, 1.5-2 cm. long;

disk flowers yellow, perfect;

pappus somewhat tawny, barbellate.

Fruits

Achenes sparsely hirsute and sometimes glandular.

Achene with short hairs, somewhat glandular.

Arnica chamissonis

Flowering time

June-August

June-September

Habitat

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

Meadows and wet places from middle elevations to the subalpine.

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 both sides of the Cascades, including the northeastern corner of Washington; Alaska to California, east to the Rocky Mountains, east across Canada to the Atlantic Coast.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Sibling taxa