Arnica rydbergii

Greene

Pittonia 4: 36. 1899.

Common names: Rydberg’s arnica
Endemic
Treatment appears in FNA Volume 21. Treatment on page 371. Mentioned on page 367.

Plants 8–35 cm. Stems (branches from rhizomes) simple. Leaves 2–4 pairs (basal often persistent on sterile rosettes), mostly cauline; petiolate (at least basal) or sessile; blades oblanceolate to spatulate, 2–7 × 0.5–2.5 cm, margins usually entire, sometimes denticulate, rarely dentate, apices usually acute, sometimes obtuse, faces sparsely puberulent, moderately pubescent distally, stipitate-glandular. Heads 1–3 (–5). Involucres turbinate-campanulate. Phyllaries 9–15, linear-oblong to narrowly lanceolate. Ray-florets 6–10; corollas yellow. Disc-florets: corollas yellow; anthers yellow. Cypselae brown, 4–7 mm, densely hirsute (not stipitate-glandular); pappi white, bristles barbellate. 2n = 38, 76.


Phenology: Flowering Jul–Aug.
Habitat: Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows
Elevation: 1200–3400 m

Distribution

V21-929-distribution-map.gif

Alta., B.C., Colo., Idaho, Mont., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Arnica rydbergii"
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 +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
oblanceolate;spatulate +
0.5cm;2.5cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
connate +  and distinct +
Rydberg’s arnica +
stipitate-glandular +  and hairy +
obovoid-cylindric +, fusiform +  and conic +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Colo. +, Idaho +, Mont. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1200–3400 m +
stipitate-glandular +, pubescent +  and puberulent +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows +
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 />) +
turbinate-campanulate +
sessile +  and petiolate +
2 (?) +  and 4 (?) +
deltate +
dentate +  and entire +
denticulate +
2-carpellate +
subplumose +  and barbellate +
persistent +
10 +  and 50 +
aristate +
Flowering Jul–Aug. +
9 +  and 15 +
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 rydbergii +
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 />) +