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Arnica cordifolia Hook.

Heartleaf arnica (en)

Species

Angiosperms > Asterales > Asteraceae > Arnica

Characteristics

Plants 10–40(–70) cm. Stems usu-ally simple, sometimes branched. Leaves 2–4(–6) pairs, mostly cauline (basal often persistent on sterile rosettes); petiolate; blades cordate or subcordate to ovate, 3–10 × 2–10 cm, margins dentate to coarsely dentate, apices acute to rounded, faces puberulent to sparsely villous, sometimes stipitate-glandular (especially adaxial). Heads 1, or 3–5(–10). Involucres broadly campanulate. Phyllaries 10–20, narrowly ovate to lanceolate. Ray florets 6–13; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae dark gray, 5–10 mm, sparsely to densely hirsute (hairs duplex), sometimes stipitate-glandular as well; pappi white, bristles barbellate. 2n = 38, 57, 76, 95, 114.
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Rhizomatous perennial 1.5–4.5 dm, hairy or glandular or both; basal and lowest cauline lvs conspicuously petiolate, with strongly cordate base, to 11 × 8 cm, generally dentate; cauline lvs reduced upwards, becoming sessile; heads 1–3, the disk 1.5–2.5 cm wide; invol 12–20 mm; rays 10–15, 2–3 cm; pappus white, strongly barbellate; 2n=(38), 57, 76 (95), the polyploids apomictic. Dry woods; Keweenaw penins., Mich.; widespread in the w. cordillera. June, July. (A. whitneyi)
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread -
Mature width (meter) -
Mature height (meter) 0.5
Root system tap-root
Rooting depth (meter) 0.2
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Woodlands in foothills up to high elevations in mountains. Conifer forests to subalpine meadows; at elevations from 500-3,000 metres.
Light 3-7
Soil humidity 5-8
Soil texture 2-5
Soil acidity 4-7
Soil nutriment -
Hardiness (USDA) 3-5

Usage

Uses medicinal poison
Edible -
Therapeutic use Love Medicine (root), Tuberculosis Remedy (tuber), Eye Medicine (unspecified), Antirheumatic (External) (unspecified), Dermatological Aid (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by cuttings or seedlings.
Mode cuttings seedlings
Germination duration (days) 25 - 30
Germination temperacture (C°) 12
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -35
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Arnica cordifolia leaf picture by Kelli Hansen (cc-by-sa)
Arnica cordifolia leaf picture by Brett Lytle (cc-by-sa)
Arnica cordifolia leaf picture by Michael Finch (cc-by-sa)

Flower

Arnica cordifolia flower picture by LadyLily (cc-by-sa)
Arnica cordifolia flower picture by Kelly D (cc-by-sa)
Arnica cordifolia flower picture by Clover Love (cc-by-sa)

Distribution

Arnica cordifolia world distribution map, present in Canada and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:178925-1
WFO ID wfo-0000081008
COL ID GT3G
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Arnica macrophylla Arnica pumila Arnica whitneyi Arnica paniculata Arnica parviflora Senecio cumingii Arnica cordifolia var. pumila Arnica cordifolia var. whitneyi Arnica cordifolia subsp. whitneyi Arnica cordifolia subsp. cordifolia Arnica cordifolia
WorldFloraDB 2024