Arnica lonchophylla

Plants 12-50 cm. Stems usually simple, rarely branched. Leaves 3-7 pairs, mostly cauline; petiolate (petioles, at least proximal, relatively narrow, ± equaling blades); blades narrowly to broadly lanceolate or ovate, 3.5-14 × 0.5-3.7 cm, margins regularly dentate or denticulate, apices acute, faces glabrous or moderately pilose, sparsely to densely stipitate-glandular. Heads 3-8 (erect). Involucres campanulate-turbinate. Phyllaries 6-14, lanceolate (apices acute). Ray florets 6-17; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae gray to brown, 3-6 mm, densely hirsute, sometimes stipitate-glandular; pappi white, bristles barbellate. 2n = 38, 57, 76.

Flowering June-Aug. Dry to mesic, open montane slopes, open woodlands, stream gravels, shorelines, calcareous rocky outcrops, to lowland Arctic tundra; 0-1500 m; Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Nunavut, Ont., Que., Sask., Yukon; Alaska, S.Dak., Wyo.

Stems 1.5-4 dm, solitary or sometimes loosely clustered, on a densely scaly rhizome; herbage finely stipitate-glandular and often also spreading-hairy or scabrous-puberulent, or the lvs subglabrous; lvs dentate, the lowest mostly persistent, 5-15 נ1.5-3.5 cm; middle and upper lvs few and reduced, sessile, the stem appearing sparsely leafy or subnaked; heads (1-)3-7(-9), turbinate or campanulate, the disk 1-2 cm wide; invol 8-12 mm; rays (6-)8(-10), 1-2 cm; pappus-bristles white, merely barbellate; ours apomictic triploids and tetraploids, 2n=57, 76. Rocky places, in our range chiefly or wholly in calcareous situations; cordilleran region of Can. and nw. U.S.; Ont. and ne. Minn.; N.S. to Que. and Nf. Ours are var. lonchophylla. (A. chionopappa) Var. arnoglossa (Greene) B. Boivin is restricted to Wyo. and w. S.D. (A. arnoglossa)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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