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Arnica louiseana
Farr
No occurrences found
Family:
Asteraceae
Images
not available
FNA
Resources
Steven J. Wolf in Flora of North America (vol. 21)
Plants
5-20 cm.
Stems
simple.
Leaves
1-3 pairs, mostly cauline (shorter plants often with leaves crowed mostly toward bases); petiolate; blades elliptic, oblong, or ovate-lanceolate, 1.5-7.5 × 0.5-2 cm, margins usually entire, rarely denticulate or slightly undulate, apices usually obtuse, sometimes acute or acuminate, faces glabrous or hispidulous-puberulent, ± densely stipitate-glandular.
Heads
usually 1, sometimes 2-3 (nodding at flowering).
Involucres
campanulate-turbinate.
Phyllaries
10-20, narrowly lanceolate (stipitate-glandular).
Ray florets
7-10; corollas yellow.
Disc florets:
corollas yellow; anthers yellow.
Cypselae
brown, 3-5 mm, abaxially glabrous, adaxially sparsely hirsute or glabrous throughout, usually stipitate-glandular toward apices, sometimes densely stipitate-glandular throughout;
pappi
white, bristles barbellate.
2
n
= 76, 95. Flowering Jul-Aug. Exposed tundra slopes and calcareous rock slides; 1800-2100 m; Alta., B.C.
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