Arnica angustifolia ssp. angustifolia Vahl
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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, well-drained sand, gravel or exposed bedrock along roadsides or in disturbed areas or in lichen woodlands with Picea mariana
Associated Species: Achillea millefolium var. borealis, Arabis holboellii, Chamerion angustifolium ssp. angustifolium
Provincial Status According
to Harms (2003):
Nature Conservancy Status:
G5 S1
Saskatchewan Species at
Risk Status:
Arnica angustifolia 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
Stems: branched, more or less densely long villous-tomentose, without conspicuous tuft of brown wool in basal leaf axil
Leaves: basal and cauline; basal leaves several, 6 – 9 cm long, oblanceolate, base tapering to winged petiole, conspicuously 3 – 5-nerved, nerves may appear reddish and extend from tip to base, long villous-tomentose, margin obscurely dentate; cauline leaves opposite, sessile, 2 – 6, to 5 cm long, lanceolate, apex acute to acuminate, conspicuously 3-nerved, more or less long villous-tomentose, margin entire to obscurely denticulate
Inflorescence: terminal and axillary, solitary to few, erect, radiate, heads to 5 cm across; peduncle and base of involucre with long-stipitate glands; phyllaries 10 – 15 in two equal or subequal series, 10 – 15 mm high; outer row lanceolate, purple-tipped; inner row linear, green with scarious margins
Flowers: ligulate and tubular florets; ray florets 5 – 15, yellow, ligule notched at tip, pistillate; tubular florets many, to 8.5 mm long, perfect; anthers yellow; style branches flattened
Fruits: achene to 6 mm long, short-hairy, slender, 5 – 10-nerved; pappus white, barbed, capillary bristles
1 Rhizomes naked except for reduced scales at nodes; 5 – 10 pairs of cauline leaves; pappus straw-coloured or brown
A. chamissonis
1 Rhizomes with overlapping scales and leaf bases; 2 – 4 pairs of cauline leaves; pappus white
2 Basal leaves cordate or broadly ovate, usually long-petiolate
A. cordifolia
2 Basal leaves linear, lanceolate or oblanceolate, usually sessile
3 Lower leaves markedly denticulate or dentate; heads 4 or 5 (11)
A. loncophylla
3 Lower leaves entire or obscurely denticulate; 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 villous-tomentose; midvein of basal leaves often reddish; stem leaves in 2 –3 pairs; head to 5 cm across; involucre purple-tipped; northern latitudes
A. angustifolia ssp. angustifolia
5 Plants glandular pubescent, not tomentose; midvein of basal leaves straw-coloured; stem leaves in 2 or 4 pairs; heads to 3 cm across; involucre not purple-tipped; prairies
A. sororia