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Arnica acaulis
Arnica acaulis
(Walter) Britton, Sterns & Poggenb.
Family:
Asteraceae
Images
not available
Flora of North America
Resources
Steven J. Wolf in Flora of North America (vol. 21)
Plants
20-80 cm.
Stems
simple.
Leaves
2-4(-6) pairs, nearly all basal; sessile; blades (with 3, 5, or 7 prominent, subparallel veins) broadly elliptic, ovate, or rhombic, 4-15 × 1.5-8 cm, margins mostly entire, apices mostly obtuse, faces hirsute and stipitate-glandular (cauline leaves 0 or 1-2, distalmost often alternate, much reduced).
Heads
3-20.
Involucres
campanulate.
Phyllaries
12-18, narrowly ovate.
Ray florets
10-16; corollas yellow.
Disc florets:
corollas yellow; anthers yellow.
Cypselae
dark gray to dark brown, 5-7 mm, glabrous or sparsely stipitate-glandular;
pappi
white, bristles barbellate.
2
n
= 38. Flowering Apr-Jun. Sandy pine woods and clearings, often in damp soils, chiefly on Coastal Plain; 0-300 m; Del., D.C., Fla., Ga., Md., N.J., N.C., Pa., S.C., Va.
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