Arnica griscomii Fern.

Plants 5–40 cm. Stems usually simple, rarely branched. Leaves 1–4 pairs, mostly cauline; petio-late; blades elliptic, lanceolate, oblanceolate, ovate, or spatulate, 1.2–10 × 0.5–3.5 cm, margins usually denticulate to dentate, rarely entire, apices acute to obtuse or abruptly pointed, faces usually glabrous or sparingly hispidulous-puberulent, rarely stipitate-glandular. Heads usually 1, sometimes 2–3 (erect or nodding). Involucres hemi-spheric to campanulate-turbinate (bases sparsely to densely pilose, hairs white or yellow). Phyllaries 9–20, lanceolate to oblanceolate, not stipitate-glandular. Ray florets 6–17; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae brown, 2.5–6 mm, abaxially glabrous, adaxially sparsely hirsute or glabrous throughout, rarely glandular; pappi white, bristles barbellate.

Arnica louiseana Farr subsp. griscomii (Fernald) Maguire

Arnica griscomii is an Asian and North American species of plants in the sunflower family, known by the common name snow arnica. It is native to eastern Russia and northwestern North America (Alaska, British Columbia, Yukon, Northwest Territories) and to eastern Canada (Quebec and Newfoundland).

Subspecies Arnica griscomii subsp. frigida (C.A.Mey. ex Iljin) S.J.Wolf - Alaska, western Canada, eastern Russia Arnica griscomii subsp. griscomii - Quebec and Newfoundland