Senecio pseudoarnica

Lessing

Linnaea 6: 240. 1831.

Illustrated
Basionym: Arnica maritima Linnaeus Sp. Pl. 2: 884. 1753,
Synonyms: S. pseudoarnica var. rollandii Victorin S. rollandii
Treatment appears in FNA Volume 20. Treatment on page 568. Mentioned on page 545.

Perennials, (15–) 20–60 (–100) cm (caudices erect). Herbage arachno-tomentose to sericeous-lanate (especially on abaxial faces of phyllaries), unevenly glabrescent. Stems single (turgid). Leaves evenly distributed (proximal withering before flowering); subsessile or petiolate; blades obovate to oblanceolate, 5–15 (–25) × 2–6 (–10) cm, bases tapered, margins serrate-dentate to denticulate or subentire (distal leaves slightly smaller). Heads 1–5 (–15+) in corymbiform arrays (involucres notably large, 20–40 mm diam.). Calyculi of 6–10 linear bractlets (longest nearly equaling phyllaries). Phyllaries ± 21, 8–15 mm (sometimes purplish or pinkish-tinged), tips greenish. Ray-florets usually ± 21, rarely 0; corolla laminae 20–25 mm. Cypselae glabrous. 2n = 40.


Phenology: Flowering summer.
Habitat: Sandy-gravelly ocean shores and upper beaches
Elevation: 0 m

Distribution

V20-1276-distribution-map.gif

St. Pierre and Miquelon, B.C., N.B., Nfld. and Labr., N.S., Que., Alaska, Maine, ne Asia

Discussion

Rayless individuals of Senecio pseudoarnica have been recognized as var. rollandii or forma rollandii (Victorin) Fernald; they are not otherwise distinctive.

Selected References

None.

Lower Taxa

None.
... more about "Senecio pseudoarnica"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
indeterminate +  and determinate +
Theodore M. Barkley† +
Lessing +
tapered +
Arnica maritima +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
obovate;oblanceolate +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
winged;nerved;ribbed +
barbellulate +  and smooth +
white +  and stramineous +
purplish +, reddish +, white +, ochroleucous +, yellow +  and white rarely reddish +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
angled +, 5-ribbed +, prismatic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
St. Pierre and Miquelon +, B.C. +, N.B. +, Nfld. and Labr. +, N.S. +, Que. +, Alaska +, Maine +  and ne Asia +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy-gravelly ocean shores and upper beaches +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
glabrescent +, arachno-tomentose +  and sericeous-lanate +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
turbinate;campanulate +
petiolate +  and subsessile +
distributed +
cauline +  and basal +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
serrate-dentate +  and denticulate or subentire +
2-carpellate +
persistent +
Flowering summer. +
mostly oblong +  and lanceolate or linear +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
Illustrated +
appendaged +  and truncate +
papillate +
S. pseudoarnica var. rollandii +  and S. rollandii +
Senecio pseudoarnica +
species +
campanulate +
denticulate +  and serrate or toothed +
60 cm600 mm <br />0.6 m <br /> (100 cm1,000 mm <br />1 m <br />) +
20 cm200 mm <br />0.2 m <br /> (60 cm600 mm <br />0.6 m <br />) +
100 cm1,000 mm <br />1 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
shrub +  and subshrub +