Arnica lanceolata

Plants (5–)20–80 cm. Stems solitary to densely clumped, simple or branched among heads. Leaves 4–8(–10) pairs, mostly cauline; usually sessile (sometimes with partly connate-sheathing bases), sometimes petiolate (proximalmost); blades lance-elliptic, lanceolate, oblanceolate, obovate, or ovate, 4–12(–20) × (1–)2–6(–8) cm, margins subentire to dentate-serrate, apices usually acute, rarely obtuse, faces glabrate to pilose. Heads (1–)3–10(–20). Involucres narrowly campanulate to turbinate. Phyllaries 8–15(–19), narrowly to broadly lanceolate. Ray florets (5–)7–17(–20); corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae brown, 4–8 mm, sparsely hirsutulous, stipitate-glandular; pappi tawny, bristles subplumose.

Distribution

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North America.

Discussion

Subspecies 2 (2 in the flora).

Selected References

None.

Lower Taxa

Arnica lanceolata subsp. lanceolata, Arnica lanceolata subsp. prima

Key

1	Cauline leaves mostly sessile (proximalmost pair petiolate); e North America	Arnica lanceolata subsp. lanceolata
1	Cauline leaves sessile (including proximalmost pair, bases sometimes partly connate-sheathing); w North America	Arnica lanceolata subsp. prima