Arnica angustifolia ssp. angustifolia Vahl
Species Image Gallery
(opens in a new window)
Family: Asteraceae or Compositae
Genus: Arnica
Species Synonyms: Arnica alpina ssp. angustifolia (Vahl) Maguire
Arnica alpina var. angustifolia (Vahl) Fern.
Arnica alpina var. attenuata (Greene) Ediger & Barkl.
Arnica alpina ssp. attenuata (Greene) Maguire
Arnica alpina var. linearis Hulten
Arnica alpina var. plantaginea (Pursh) Ediger & Barkl.
Arnica alpina ssp. sornborgeri (Fern.) Maguire
Arnica alpina var. ungavensis Boivin
Arnica alpina var. vestita Hulten
Arnica angustifolia ssp. attenuata (Greene) G.W. Douglas
Arnica plantaginea Pursh
Arnica sornborgeri Fern.
Arnica terrae-novae Fern.
Common Names: narrowleaf arnica
Canada: Yukon, Northwest Territories, northern British Columbia, northern Saskatchewan – northern Ontario – Labrador
Saskatchewan: northern Saskatchewan; Lake Athabasca – Hasbala Lake
Ecoregion: Selwyn Lake Upland, Tazin Lake Upland
Saskatchewan: moist but well-drained sand, gravel or exposed bedrock along roadsides or in disturbed areas or in lichen woodlands with black spruce
Associated Species: boreal yarrow, fireweed, Holboell rockcress
Provincial Status According
to Harms (2003):
Nature Conservancy Status:
G5 S1
Saskatchewan Species at
Risk Status:
Narrowleaf arnica is endangered because of rarity in Saskatchewan. There are only four to eight known localities of this plant in the province. No immediate threats are known but are possible in the future.
Height: 15 – 25 cm tall
Roots: rhizomes with overlapping scales and leaf bases or woody base
Stems: branched, more or less densely long-hairy, without conspicuous tuft of brown wool in basal leaf axils
Leaves: basal and on the stem; basal leaves several, 6 – 9 cm long, inversely lance-shaped, base tapering to winged petiole, conspicuously 3 – 5-nerved, nerves may appear reddish and extend from tip to base, long-hairy, margin obscurely toothed; stem leaves opposite, sessile, 2 – 6, to 5 cm long, lance-shaped, apex tapered, conspicuously 3-nerved, more or less long-hairy, margins entire to obscurely toothed
Inflorescence: terminal and axillary, solitary to few, erect, heads to 5 cm across; stalk and base of involucre glandular; bracts 10 – 15 in two equal or subequal series, 10 – 15 mm high; outer row lance-shaped, purple-tipped; inner row linear, green with dry and membranous margins
Flowers: ray and disc florets; ray florets 5 – 15, yellow, petal notched at tip, pistillate; disc florets many, to 8.5 mm long, perfect; anthers yellow; style branches flattened
Fruits: achene short-hairy, to 6 mm long, slender, 5 – 10-nerved; pappus white, barbed, capillary bristles
1 Rhizomes naked except for reduced scales at nodes; 5 – 10 pairs of stem leaves; pappus straw-coloured or brown
A. chamissonis
1 Rhizomes with overlapping scales and leaf bases; 2 – 4 pairs of stem leaves; pappus white
2 Basal leaves cordate or broadly oval, usually long-stalked
A. cordifolia
2 Basal leaves linear, lance-shaped or inversely lance-shaped, usually sessile
3 Lower leaves markedly toothed, heads 4 or 5 (11)
A. loncophylla
3 Lower leaves entire or obscurely toothed, heads 1 – few
4 Old basal leaf bases with a dense tuft of brown hairs in leaf axils
A. fulgens
4 Old basal leaf bases without a dense tuft of brown hairs in leaf axils
5 Plants more or less densely long hairy; midvein of basal leaves often reddish; stem leaves in 2 – 3 pairs; head to 5 cm across; bracts purple-tipped; northern latitudes
A. angustifolia ssp. angustifolia
5 Plants glandular hairy, not long hairy; midvein of basal leaves straw-coloured; stem leaves in 2 or 4 pairs; heads to 3 cm across; bracts not purple-tipped; prairies
A. sororia