Burke: Arnica ovata vs. Arnica parryi

	Arnica ovata	Arnica parryi
	sticky arnica, sticky-leaf arnica	Parry's arnica
Habit	Perennial from a freely rooting rhizome, the stems solitary or tufted, 1.5-4 dm. tall.	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 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.	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 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 several, nodding in bud, rayless; involucres 10-14 mm. high, their bracts sharp pointed; pappus tawny, sub-plumose.
Fruits	Achene.	Achenes glabrous to glandular or hairy.

	Arnica ovata	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	July-September	June-August
Habitat	Rocky places from middle elevations to the subalpine and alpine.	Open woods and meadows, from middle elevations to the alpine.
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; 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. 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. latifolia, A. longifolia, A. mollis, A. nevadensis, A. ovata, 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 parryi

sticky arnica, sticky-leaf arnica

Parry's arnica

Habit

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

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 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.

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 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 several, nodding in bud, rayless;

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

pappus tawny, sub-plumose.

Fruits

Achene.

Achenes glabrous to glandular or hairy.