Arnica cernua

Howell

Fl. N.W. Amer., 373. 1900.

Common names: Serpentine arnica
Endemic
Synonyms: Arnica chandleri Rydberg
Treatment appears in FNA Volume 21. Treatment on page 374. Mentioned on page 368.

Plants 10–30 cm. Stems (often reddish purple) mostly simple. Leaves 3–4 pairs, mostly cauline (basal often persistent on sterile rosettes); petiolate (petioles usually narrow, proximalmost sometimes broadly winged); blades (often reddish purple) usually elliptic to ovate, sometimes subcordate, 1.5–8 × 1.5–4 cm (often relatively thick, nearly succulent), margins usually entire or serrate, sometimes crenate or slightly lobed, apices acute to rounded, faces glabrous or scabrous. Heads usually 1, sometimes 2–3 (often nodding in bud). Involucres campanulate-turbinate. Phyllaries 8–14, ovate to broadly lanceolate. Ray-florets 5–10; corollas yellow to slightly orange. Disc-florets: corollas yellow; anthers yellow. Cypselae dark gray, 6–8 mm, sparsely to densely hirsute (hairs duplex); pappi white, bristles usually barbellate, sometimes subplumose. 2n = 38.


Phenology: Flowering Apr–Jun.
Habitat: Serpentine soils, conifer forests
Elevation: 500–1500 m

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Arnica cernua"
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 +
Howell +
decurrent +
compound +  and simple +
1.5 cm15 mm <br />0.015 m <br /> (8 cm80 mm <br />0.08 m <br />) +
subcordate;usually elliptic;ovate +
1.5cm;4cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
subplumose +  and barbellate +
connate +  and distinct +
Serpentine arnica +
yellow +  and slightly orange +
stipitate-glandular +  and hairy +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Oreg. +
500–1500 m +
scabrous +  and glabrous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Serpentine soils, 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 />) +
campanulate-turbinate +
3 (?) +  and 4 (?) +
deltate +
serrate +  and entire +
lobed +  and crenate +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
Flowering Apr–Jun. +
8 +  and 14 +
Fl. N.W. Amer., +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
distinct +
4 +  and 20 +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Arnica chandleri +
Arnica cernua +
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 />) +