Burke: Arnica lanceolata vs. Arnica parryi

	Arnica lanceolata	Arnica parryi
	clasping arnica, stream bank arnica	Parry's arnica
Habit	Perennial from a freely-rooting rhizome, 3-8 dm. tall, more or less glandular and hairy.	Heads generally several, narrow, with few disk flowers; involucre 10-14 mm. high with pointed bracts, covered with stalked glands; rays about 8 or about 13, 1.5-2 cm. long; pappus straw-colored, sub-plumose.
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.	Cauline leaves 2-4 pairs, strongly reduced upward, with lanceolate or lance-ovate blades 5-20 cm. long and 1.5-6 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, nodding in bud, rayless; involucres 10-14 mm. high, their bracts sharp pointed; pappus tawny, sub-plumose.
Fruits	Achenes sparsely hirsute and sometimes glandular.	Achenes glabrous to glandular or hairy.

	Arnica lanceolata	Arnica parryi
Identification notes		The other rayless species in our area, Arnica discoidea, has wider leaves, and the heads are upright in bud.
Flowering time	June-August	June-August
Habitat	Streambanks, moist woods and meadows from middle elevations to the subalpine.	Open woods and meadows, from middle elevations to the alpine.
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; Yukon Territory 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. latifolia, A. longifolia, A. mollis, A. nevadensis, A. ovata, 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 parryi

clasping arnica, stream bank arnica

Parry's arnica

Habit

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

Heads generally several, narrow, with few disk flowers; involucre 10-14 mm. high with pointed bracts, covered with stalked glands; rays about 8 or about 13, 1.5-2 cm. long; pappus straw-colored, sub-plumose.

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.

Cauline leaves 2-4 pairs, strongly reduced upward, with lanceolate or lance-ovate blades 5-20 cm. long and 1.5-6 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, nodding in bud, rayless;

involucres 10-14 mm. high, their bracts sharp pointed;

pappus tawny, sub-plumose.

Fruits

Achenes sparsely hirsute and sometimes glandular.

Achenes glabrous to glandular or hairy.

Arnica lanceolata

Arnica parryi

Identification notes

The other rayless species in our area, Arnica discoidea, has wider leaves, and the heads are upright in bud.

Flowering time

June-August

Habitat

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

Open woods and meadows, from middle elevations to the alpine.

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]