Burke: Arnica ovata vs. Arnica latifolia

	Arnica ovata	Arnica latifolia
	sticky arnica, sticky-leaf arnica	broad-leaved arnica, mountain arnica, daffodil leopardbane
Habit	Perennial from a freely rooting rhizome, the stems solitary or tufted, 1.5-4 dm. tall.	Perennial, 1-6 dm. tall, glandular at least above.
Leaves	Cauline leaves 3-4 pairs, mostly sessile, ovate to deltoid or elliptic, irregularly toothed, the middle ones the largest, with blades 4-8 cm. long and 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 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.	Heads 1-several; involucre 7-18 mm. high, more or less glandular; pappus white, barbellate.
Fruits	Achene.	Achenes glabrous, at least toward the base.

	Arnica ovata	Arnica latifolia
Identification notes		The similar Arnica cordifolia has larger heads, frequently solitary; its leaves and achenes are pubescent.
Flowering time	July-September	June-August
Habitat	Rocky places from middle elevations to the subalpine and alpine.	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; Alaska to California, east to Montana and Utah. [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. lanceolata, A. latifolia, A. longifolia, A. mollis, A. nevadensis, 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
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, 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

sticky arnica, sticky-leaf arnica

broad-leaved arnica, mountain arnica, daffodil leopardbane

Habit

Perennial from a freely rooting rhizome, the stems solitary or tufted, 1.5-4 dm. tall.

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

Leaves

Cauline leaves 3-4 pairs, mostly sessile, ovate to deltoid or elliptic, irregularly toothed, the middle ones the largest, with blades 4-8 cm. long and 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 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.

Heads 1-several;

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

pappus white, barbellate.

Fruits

Achene.

Achenes glabrous, at least toward the base.