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Arnica rydbergii
Greene
No occurrences found
Family:
Asteraceae
Rydberg's arnica
[
Arnica cascadensis
H. St. John]
Images
not available
FNA
Resources
Steven J. Wolf in Flora of North America (vol. 21)
Plants
8-35 cm.
Stems
(branches from rhizomes) simple.
Leaves
2-4 pairs (basal often persistent on sterile rosettes), mostly cauline; petiolate (at least basal) or sessile; blades oblanceolate to spatulate, 2-7 × 0.5-2.5 cm, margins usually entire, sometimes denticulate, rarely dentate, apices usually acute, sometimes obtuse, faces sparsely puberulent, moderately pubescent distally, stipitate-glandular.
Heads
1-3(-5).
Involucres
turbinate-campanulate.
Phyllaries
9-15, linear-oblong to narrowly lanceolate.
Ray florets
6-10; corollas yellow.
Disc florets:
corollas yellow; anthers yellow.
Cypselae
brown, 4-7 mm, densely hirsute (not stipitate-glandular);
pappi
white, bristles barbellate
. 2
n
= 38, 76. Flowering Jul-Aug. Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows; 1200-3400 m; Alta., B.C.; Colo., Idaho, Mont., Oreg., Utah, Wash., Wyo.
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