Senecio sylvaticus
Senecio bigelovii
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort
nodding groundsel, nodding ragwort
puberulent (hairs abundant, curly).
usually floccose-tomentose to glabrescent, sometimes glabrous.
single.
single or loosely clustered.
evenly distributed; petiolate;
blades obovate to oblong, 3–7(–12) × 1–3(–4) cm, usually 1–2-pinnate, bases tapered, ultimate margins dentate (distal leaves similar, clasping, bractlike).
progressively reduced distally; petiolate (proximal);
blades ovate to lanceolate, 7–15 × (1–)2–5 cm, bases contracted or tapered, margins subentire or serrate to dentate (mid and distal leaves similar, sessile, bractlike, often clasping).
0 or 1–8+;
corolla laminae usually 1–2+ mm (barely surpassing phyllaries).
0.
± 13 (± 21), 4–7+ mm, tips greenish or minutely black.
± 13 or ± 21, 6–12 mm, tips green.
0 or of 1–5+ linear to filiform bractlets.
of 4–10 linear bractlets (lengths mostly 1/3–1/2 phyllaries, sometimes 1 or 2 equaling phyllaries).
12–24 in corymbiform arrays.
nodding (especially when young), (1–)3–12(–20) in racemiform or paniculiform arrays (terminal heads often largest).
hairy (especially on angles).
glabrous.
= 40.
= 40.
Senecio sylvaticus
Senecio bigelovii
Senecio sylvaticus is a Eurasian weed that favors cool, wet climates. It is well established in coastal areas of the Pacific Coast and in parts of Newfoundland and Quebec; elsewhere in the flora, it appears to be sporadic.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
The two varieties of Senecio bigelovii are distinguished by morphologic tendencies and by geography.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Herbage glabrous or nearly so (at flowering); blades of proximal leaves often abruptly contracted or at least obtuse at bases; mid and distal leaves clasping; phyllaries mostly 13, 6–8+ mm | var. bigelovii |
1. Herbage often floccose-tomentose, especially among heads and on abaxial faces of leaves; blades of proximal leaves usually tapered to petioles; mid and distal leaves weakly, if at all, clasping; phyllaries mostly 21, (7–)8–12 mm | var. hallii |
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