Arnica acaulis (Walter) Britton, Sterns & Poggenb.
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Authority
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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Family
Asteraceae
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Scientific Name
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Description
Species Description - Perennial 2–8 dm from a short, simple, erect caudex 5–20 mm, with numerous fibrous roots; herbage glandular and hirsute; basal lvs rosulate, sessile or nearly so, broadly elliptic to ovate or even rhombic, obscurely toothed or subentire, 4–15 × 1.5–8 cm; cauline lvs few and reduced, the uppermost often alternate; heads 3–20, campanulate, the disk 13–20 mm wide; invol 10–12 mm; rays 10–15, 1.5–2.5 cm; pappus white, merely barbellate; 2n=38. Sandy pine woods; Del. and se. Pa., s. mainly along the coastal plain to Fla. May–July.
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Common Names
southeastern arnica