Flora of North America species comparison

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Senecio pseudoarnica

beach groundsel, seaside ragwort
Habit 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).
Ray florets

usually ± 21, rarely 0;

corolla laminae 20–25 mm.
Phyllaries

± 21, 8–15 mm (sometimes purplish or pinkish-tinged), tips greenish.
Calyculi

of 6–10 linear bractlets (longest nearly equaling phyllaries).
Heads

1–5(–15+) in corymbiform arrays (involucres notably large, 20–40 mm diam.).
Cypselae

glabrous.
2n

= 40.

Senecio pseudoarnica
Phenology Flowering summer.
Habitat Sandy-gravelly ocean shores and upper beaches
Elevation 0 m (0 ft)
Distribution
from FNA
AK; ME; BC; NB; NL; NS; QC; SPM; ne Asia
[BONAP county map]
Discussion

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

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 568.
Parent taxa Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Synonyms Arnica maritima, S. pseudoarnica var. rollandii, S. rollandii
Name authority Lessing: Linnaea 6: 240. (1831)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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