Flora of North America species comparison

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Senecio squalidus

oxford ragwort
Habit Annuals (or perennials), 15–60+ cm (taprooted).
Herbage

sparsely, unevenly floccose to subglabrous, glabrescent.
Stems

single (branching distally).
Leaves

evenly distributed;

petiolate (proximal, petioles ± winged);

blades obovate to oblong, 4–10 × 2–4+ cm, mostly lyrate-pinnatifid to pinnate, bases tapered, ultimate margins dentate (distal leaves similar, smaller, sessile).
Ray florets

± 13;

corolla laminae 5–8 mm.
Phyllaries

(± 13) ± 21, 5–6+ mm, tips black.
Calyculi

of 4–10+ bractlets (1–2+ mm).
Heads

(3–)6–20 in open, cymiform arrays.
Cypselae

usually hairy.
2n

= 20.

Senecio squalidus
Phenology Flowering late winter–spring or fall.
Habitat Disturbed sites (in regions of cool, damp climates)
Elevation 0–300 m (0–1000 ft)
Distribution
from FNA
CA; NS; Europe [Introduced in North America]
[BONAP county map]
Discussion

Senecio squalidus is native in Europe, where it is a common weed. It is apparently established in the San Francisco Bay area, California and has been reported from British Columbia, New Brunswick, and Nova Scotia. It is to be expected elsewhere.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 560.
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. pseudoarnica, 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. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Name authority Linnaeus: Sp. Pl. 2: 869. (1753)
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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