Burke: Arnica latifolia vs. Arnica mollis

	Arnica latifolia	Arnica mollis
	broad-leaved arnica, mountain arnica, daffodil leopardbane	cordilleran arnica, hairy arnica, cordilleran leopardbane
Habit	Perennial, 1-6 dm. tall, glandular at least above.	Perennial from freely rooting rhizomes, 2-6 dm. tall.
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 3-4 pairs, sessile, only slightly reduced upward, lanceolate to narrowly ovate or elliptic, irregularly dentate to entire.
Flowers	Heads 1-several; involucre 7-18 mm. high, more or less glandular; pappus white, barbellate.	Heads few or solitary; involucre 10-16 mm. high, the bracts pointed, long-hairy at the base; rays 12-18, 1.5-2.5 cm. long; pappus tawny, sub-plumose.
Fruits	Achenes glabrous, at least toward the base.	Achene

	Arnica latifolia	Arnica mollis
Identification notes	The similar Arnica cordifolia has larger heads, frequently solitary; its leaves and achenes are pubescent.
Flowering time	June-August	June-September
Habitat	Common in forest openings and meadows, and open, rocky areas from middle to high elevations in the mountains.	Moist meadows from middle elevations to the alpine.
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 and in the Olympic Mountains 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. 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. lanceolata, A. latifolia, A. longifolia, 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	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 mollis

broad-leaved arnica, mountain arnica, daffodil leopardbane

cordilleran arnica, hairy arnica, cordilleran leopardbane

Habit

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

Perennial from freely rooting rhizomes, 2-6 dm. tall.

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 3-4 pairs, sessile, only slightly reduced upward, lanceolate to narrowly ovate or elliptic, irregularly dentate to entire.

Flowers

Heads 1-several;

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

pappus white, barbellate.

Heads few or solitary;

involucre 10-16 mm. high, the bracts pointed, long-hairy at the base;

rays 12-18, 1.5-2.5 cm. long;

pappus tawny, sub-plumose.

Fruits

Achenes glabrous, at least toward the base.

Achene