Arnica griscomii

Fernald

Rhodora 26: 105, plate 143, fig. 7. 1924.

Common names: Snow arnica
Synonyms: Arnica louiseana subsp. griscomii (Fernald) Maguire
Treatment appears in FNA Volume 21. Treatment on page 371. Mentioned on page 368.

Plants 5–40 cm. Stems usually simple, rarely branched. Leaves 1–4 pairs, mostly cauline; petiolate; blades elliptic, lanceolate, oblanceolate, ovate, or spatulate, 1.2–10 × 0.5–3.5 cm, margins usually denticulate to dentate, rarely entire, apices acute to obtuse or abruptly pointed, faces usually glabrous or sparingly hispidulous-puberulent, rarely stipitate-glandular. Heads usually 1, sometimes 2–3 (erect or nodding). Involucres hemispheric to campanulate-turbinate (bases sparsely to densely pilose, hairs white or yellow). Phyllaries 9–20, lanceolate to oblanceolate, not stipitate-glandular. Ray-florets 6–17; corollas yellow. Disc-florets: corollas yellow; anthers yellow. Cypselae brown, 2.5–6 mm, abaxially glabrous, adaxially sparsely hirsute or glabrous throughout, rarely glandular; pappi white, bristles barbellate.

Distribution

V21-925-distribution-map.gif

B.C., N.W.T., Nfld. and Labr. (Nfld.), Que., Yukon, Alaska, Asia (e Russia)

Discussion

Subspecies 2 (2 in the flora).

Selected References

None.

Key

1 Involucre bases sparsely to moderately white-pilose; Newfoundland, Québec Arnica griscomii subsp. griscomii
1 Involucre bases densely yellow-pilose; w North-west Territories to n British Columbia, Alaska Arnica griscomii subsp. frigida
... more about "Arnica griscomii"
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 +
Fernald +
decurrent +
compound +  and simple +
1.2 cm12 mm <br />0.012 m <br /> (10 cm100 mm <br />0.1 m <br />) +
spatulate;ovate;spatulate;ovate;oblanceolate;lanceolate;elliptic +
0.5cm;3.5cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
connate +  and distinct +
Snow arnica +
stipitate-glandular +  and hairy +
glabrous +  and hirsute +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
B.C. +, N.W.T. +, Nfld. and Labr. (Nfld.) +, Que. +, Yukon +, Alaska +  and Asia (e Russia) +
stipitate-glandular +, hispidulous-puberulent +  and glabrous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
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 />) +
hemispheric;campanulate-turbinate +
1 (?) +  and 4 (?) +
deltate +
denticulate to dentate +  and denticulate +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
not stipitate-glandular +
9 +  and 20 +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
distinct +
4 +  and 20 +
exalbuminous +
branched +  and simple +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Arnica louiseana subsp. griscomii +
Arnica griscomii +
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 />) +