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"
Theodore M. Barkley† +
Lessing +
Arnica maritima +
St. Pierre and Miquelon +, B.C. +, N.B. +, Nfld. and Labr. +, N.S. +, Que. +, Alaska +, Maine +  and ne Asia. +
Sandy-gravelly ocean shores and upper beaches +
Flowering summer. +
Illustrated +
S. pseudoarnica var. rollandii +  and S. rollandii +
Senecio pseudoarnica +
species +