Arnica louiseana

Farr

Ottawa Naturalist 20: 109. 1906.

Common names: Lake Louise arnica snow arnica
Endemic
Treatment appears in FNA Volume 21. Treatment on page 371. Mentioned on page 368.

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 ovatelanceolate, 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. 2n = 76, 95.


Phenology: Flowering Jul–Aug.
Habitat: Exposed tundra slopes and calcareous rock slides
Elevation: 1800–2100 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Arnica louiseana"
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 +
decurrent +
compound +  and simple +
1.5 cm15 mm <br />0.015 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
ovatelanceolate;oblong;ovatelanceolate;oblong;elliptic +
0.5cm;2cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
connate +  and distinct +
Lake Louise arnica +  and snow arnica +
stipitate-glandular +  and hairy +
stipitate-glandular +, glabrous +  and hirsute +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +  and B.C. +
1800–2100 m +
stipitate-glandular +, hispidulous-puberulent +  and glabrous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Exposed tundra slopes and calcareous rock slides +
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 />) +
campanulate-turbinate +
1 (?) +  and 3 (?) +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
undulate +, denticulate +  and entire +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
Flowering Jul–Aug. +
10 +  and 20 +
Ottawa Naturalist +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
distinct +
4 +  and 20 +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Arnica louiseana +
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 />) +