Sticky Leaf Arnica

Plants 10–50 cm. Stems (forming clumps) simple or branched among heads. Leaves 2–3(–4) pairs (basal 1–2 pairs usually withered by flowering, petiolate, petioles broadly winged, blades round-ovate, relatively small; sterile rosettes lacking), mostly cauline; petiolate (at least middle pair, petioles broadly to narrowly winged); blades broadly deltate to ovate, 4–8 × 2–6 cm (middle pair largest), margins irregularly denticulate to coarsely dentate-serrate, apices acute, faces puberulent (hairs minute) and stipitate-glandular. Heads 1–3(–5). Involucres usually narrowly turbinate, rarely narrowly campanulate. Phyllaries 9–20, linear to narrowly lanceolate. Ray florets 8–16, yellow. Disc florets: corollas yellow; anthers yellow. Cypselae brown to black, 5–7 mm, sparsely to moderately pilose and stipitate-glandular; pappi stramineous to tawny, bristles subplumose. 2n = 57, 76.

Arnica diversifolia Greene; A. latifolia Bongard var. viscidula A. Gray

Arnica diverslfolia Greene, Pittonia 4: 171. 1900
Arnica lalifolia viscidula A. Gray, Syn. Fl. N. Am. 1 J : 381. 1876.
Rootstock branched; stem 3-4 dm. high, glandular-puberulent, rarely with a few scattered hairs, angled, slightly sulcate; basal leaves and those of the offsets long-petioled; blades broadly ovate or subcordate, coarsely dentate, 3-8 cm. long, glandular-puberulent on both sides, and usually sparingly hairy above, 3-5-ribbed; stem-leaves usually 3 pairs, the lowest similar to the basal ones, but the petioles shorter, more or less winged and sheathing at the base, the uppermost sessile, broadly ovate, those of the inflorescence lanceolate; heads 1-7, cymose; involucre broadly turbinate, about 12 mm. high and 15 mm. broad, densely glandularpuberulent, sometimes with a few long hairs; bracts 15-20, linear or linear-lanceolate, acuminate; ray-flowers 8-12, the ligules 15-18 mm. long, 3-4 mm. wide; disk-flowers 7-8 mm. long; achenes 7-8 mm. long, sulcate, hirsute on the angles, as well as sparingly glandular-granuliferous; pappus-bristles light-brownish, 8 mm. long, short-plumose.
Type locality: Powder River Mountains, Oregon
Distribution: Mountains from the Sierra Nevada, California, to Alberta and Southern Yukon.

Arnica ovata Greene, Pittonia 4: 161. 1900
Arnica subplumosa sihalica A. Nels.; Coult. & Nels. Man. 572, in part. 1909.
Rootstock stout; stem angled, sulcate, 3-4 dm. high, hirsute with crisp hairs and glandularpuberulent above; stem-leaves 2-4 pairs, the lower with short petioles connate-sheathing at the bases, the blades oval, 3-5 cm. long, short-hirsute and conspicuously glandular-granuliferous, the upper stem-leaves ovate or lance-ovate, sessile, 3-4 cm. long, 1-2 cm. wide; heads 1-5; peduncles 3-10 cm. long, glandular-hirsutulous; involucre turbinate-campanulate, 10-11 mm. high, 10-15 mm. broad, glandular-hirsutulous; bracts 15-18, lanceolate, acuminate; rayflowers 12-15, the ligules orange, 10 mm. long, 3-4 mm. wide; disk-corollas 6 mm. long; achenes hispidulous and glandular-granuliferous; pappus-bristles 6 mm. long, light-brown, short-plumose.
Type locality: Wasatch Mountains. Utah. Distribution: Utah and western Colorado.

Arnica ovata is a North American species of flowering plant in the family Asteraceae, known by the common name sticky leaf arnica. It is native to western Canada (Yukon, Alberta, British Columbia), and the western United States (Alaska, Washington, Oregon, California, Nevada, Utah, Idaho, Montana, Wyoming, Colorado).

Arnica ovata is an herb up to 50 cm (20 inches) tall. Flower heads are yellow, with both ray florets and disc florets. It grows in meadows and coniferous forests in mountainous areas.