Arnica gracilis

Rydberg

Bull. Torrey Bot. Club 24: 297. 1897.

Common names: Smallhead arnica
Endemic
Synonyms: Arnica latifolia var. gracilis (Rydberg) Cronquist
Treatment appears in FNA Volume 21. Treatment on page 376. Mentioned on page 368.
Revision as of 22:59, 29 July 2020 by imported>Volume Importer
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Plants 10–30 cm. Stems (often 5–10 in dense clumps) branched distally. 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 ovatelanceolate, 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, ovatelanceolate. 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. 2n = 57, 76.


Phenology: Flowering Jul–Aug.
Habitat: Dry, exposed, rocky, alpine slopes, sometimes subalpine meadows
Elevation: 1200–2500 m

Distribution

V21-946-distribution-map.gif

Alta., B.C., Idaho, Mont., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Arnica gracilis"
stipitate-glandular +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
corymbiform +  and cymiform +
indeterminate +  and determinate +
Steven J. Wolf +
Rydberg +
decurrent +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
ovate;ovatelanceolate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
connate +  and distinct +
Smallhead arnica +
stipitate-glandular +  and hairy +
stipitate-glandular +  and hairy +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Idaho +, Mont. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1200–2500 m +
glabrous +, glandular +, hairy +, stipitate-glandular +, woolly +, villous +, tomentose +, scabrous +, puberulent +, pilose +, hispidulous +  and hirsute +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Dry, exposed, rocky, alpine slopes, sometimes subalpine meadows +
discoid +  and radiate +
in cymiform or corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
turbinate-campanulate +
2 (?) +  and 3 (?) +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
irregularly serrate +  and subentire +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
Flowering Jul–Aug. +
10 +  and 16 +
Bull. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
distinct +
4 +  and 20 +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Arnica latifolia var. gracilis +
Arnica gracilis +
species +
campanulate +  and cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
5 cm50 mm <br />0.05 m <br /> (100 cm1,000 mm <br />1 m <br />) +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +