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Arnica gracilis
Rydb.
Family:
Asteraceae
Slender Leopardbane
[
Arnica arcana
A. Nelson,
more
Arnica columbiana
,
Arnica lactucina
]
FNA
Resources
Steven J. Wolf in Flora of North America (vol. 21)
Plants
10-30 cm.
Stems
(often 5-10 in dense clumps) branched distal-ly.
Leaves
2-3 pairs, mostly cauline (basal leaves often persistent on sterile rosettes, similar to cauline leaves); petiolate (petioles narrowly to broadly winged, distal pair of leaves often reduced, connate-perfoliate); blades ovate to ovate-lanceolate, 2-6 × 1-3 cm, margins irregularly serrate to subentire, apices acute, faces: abaxial glandular, adaxial stipitate-glandular.
Heads
(1-)5-15.
Involucres
turbinate-campanulate.
Phyllaries
10-16, ovate-lanceolate.
Ray florets
5-12; corollas yellow.
Disc florets:
corollas yellow; anthers yellow.
Cypselae
black, 4.5-7 mm, hairy (hairs duplex) and stipitate-glandular;
pappi
white, bristles barbellate.
2
n
= 57, 76.
Flowering Jul-Aug. Dry, exposed, rocky, alpine slopes, sometimes subalpine meadows; 1200-2500 m; Alta., B.C.; Idaho, Mont., Oreg., Utah, Wash., Wyo.
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Development supported by National Science Foundation Grants (
DBI 9983132
,
BRC 0237418
,
DBI 0743827
,
DBI 0847966
)
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