Senecio vulgaris
Senecio spartioides
common groundsel, common ragwort, old-man-in-the-spring
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel
glabrous or sparsely and unevenly tomentose when young.
usually glabrous, sometimes sparsely, unevenly hairy.
usually 1.
usually multiple (branching and arching upward).
evenly distributed; petiolate;
blades ovate to oblanceolate, 2–10 × 0.5–2(–4) cm, bases tapered, margins lobulate to dentate, ultimate margins often secondarily dentate to denticulate (distal leaves sessile).
evenly distributed (proximal often smaller);
sessile or obscurely petiolate;
blades narrowly linear to filiform (or parted into linear-filiform lobes), 5–10 cm × 1–6 mm, bases ± linear, ultimate margins entire.
0.
± 5 (± 13);
corolla laminae 8–12 mm.
± 21, 4–6 mm, tips usually green, sometimes black.
usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black.
of 2–4(–6+) bractlets (prominent, black-tipped, lengths about 1/4 phyllaries).
0 or of 1–3+ (minute, inconspicuous) bractlets.
8–20 in loose, corymbiform arrays.
10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.).
usually sparsely hairy, sometimes nearly glabrous.
usually hirtellous, sometimes glabrous.
= 40.
= 40.
Senecio vulgaris
Senecio spartioides
Senecio vulgaris has not been collected in the Canadian Arctic north of Hudson Bay.
A widely scattered weed of Eurasian origin, Senecio vulgaris is particularly abundant in southern areas of cool damp winters or northern areas of cool damp summers.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Plants with the leaves parted into lobes that are seldom more than 1 mm wide have been recognized as Senecio spartioides var. multicapitatus (or as S. multicapitatus); expression of the character is inconsistent throughout the range and recognition of the two entities is all but impossible to maintain.
Senecio spartioides apparently hybridizes with S. eremophilus in Garfield County, Utah, and perhaps elsewhere (cf., Holmgren, Reveal, and LaFrance 3463, BRY, KSC, NY). The name Senecio toiyabensis rests upon materials that suggest introgression with S. fremontii. Some specimens usually referred to 41. S. pattersonensis suggest introgression with S. spartioides.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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