Arnica viscosa

A. Gray

Proc. Amer. Acad. Arts 13: 374. 1878.

Common names: Mt. Shasta arnica
Endemic
Synonyms: Chrysopsis shastensis Jepson Raillardella paniculata Greene
Treatment appears in FNA Volume 21. Treatment on page 377. Mentioned on page 367.

Plants 20–50 cm. Stems branched (prominently ribbed, strongly stipitate-glandular; caudices woody). Leaves 5–10 pairs (main-stems, 2–6 pairs on branches; basal withered by flowering), cauline; sessile; blades obovate-oblong to ovate-oblong, (1–) 2–4 (–5) × 1–3 cm, margins ± entire, apices acute, faces sparsely to densely pilose, densely stipitate-glandular. Heads 10–20. Involucres narrowly turbinate. Phyllaries 10–20, broadly lanceolate (stipitate-glandular). Ray-florets 0. Disc-florets 10–30; corollas cream; anthers yellow. Cypselae dark gray, 4.5–6.5 mm, stipitate-glandular; pappi usually white, rarely tawny, bristles barbellate to subplumose. 2n = 38.


Phenology: Flowering Aug–Sep.
Habitat: Open, rocky subalpine to alpine
Elevation: 1700–2500 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Arnica viscosa"
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 +
A. Gray +
decurrent +
compound +  and simple +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
obovate-oblong;ovate-oblong +
1cm;3cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellate +  and subplumose +
connate +  and distinct +
Mt. Shasta arnica +
stipitate-glandular +  and hairy +
stipitate-glandular +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Oreg. +
1700–2500 m +
stipitate-glandular +  and pilose +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Open, rocky subalpine to alpine +
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 />) +
sessile +  and petiolate +
cauline +  and basal +
5 (?) +  and 10 (?) +
deltate +
toothed +  and entire +
2-carpellate +
subplumose +  and barbellate +
tawny +  and white +
persistent +
10 +  and 50 +
aristate +
Flowering Aug–Sep. +
10 +  and 20 +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
distinct +
4 +  and 20 +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Chrysopsis shastensis +  and Raillardella paniculata +
Arnica viscosa +
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 />) +