Arnica sororia

Greene

Ottawa Naturalist 23: 213. 1910.

Common names: Twin arnica
Endemic
Synonyms: Arnica fulgens var. sororia (Greene) G. W. Douglas & Ruyle-Douglas
Treatment appears in FNA Volume 21. Treatment on page 370. Mentioned on page 367.

Plants 15–50 cm. Stems (1 or relatively few) simple or branched. Leaves 3–6 pairs, crowded toward stem-bases (axils lacking tufts of brown wool); petiolate (petioles, at least basal, narrowly winged); blades (with 3 or 5, prominent, subparallel veins) oblanceolate to narrowly oblong, 3.5–14.5 × 0.6–2.4 cm, margins usually entire, rarely denticulate, apices obtuse, faces uniformly hairy, stipitate-glandular. Heads 1–5. Involucres hemispheric. Phyllaries 13–20, usually narrowly, sometimes broadly, lanceolate. Ray-florets 9–17; corollas yellow-orange. Disc-florets: corollas yellow; anthers yellow. Cypselae brown, 3.5–5 mm, densely hirsute, sometimes sparingly glandular as well; pappi white, bristles barbellate. 2n = 38.


Phenology: Flowering May–Jul.
Habitat: Prairies and grasslands to montane conifer forests
Elevation: 500–1500 m

Distribution

V21-924-distribution-map.gif

Alta., B.C., Sask., Calif., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Arnica sororia"
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 +
Greene +
decurrent +
compound +  and simple +
3.5 cm35 mm <br />0.035 m <br /> (14.5 cm145 mm <br />0.145 m <br />) +
oblanceolate;narrowly oblong +
0.6cm;2.4cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
connate +  and distinct +
Twin arnica +
yellow +  and yellow-orange +
stipitate-glandular +  and hairy +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Sask. +, Calif. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
500–1500 m +
stipitate-glandular +  and hairy +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Prairies and grasslands to montane conifer forests +
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 +
cauline +  and basal +
3 (?) +  and 6 (?) +
deltate +
denticulate +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
Flowering May–Jul. +
13 +  and 20 +
Ottawa Naturalist +
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 fulgens var. sororia +
Arnica sororia +
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 />) +