Senecio sylvaticus
Senecio eremophilus
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort
cut-leaf groundsel, desert ragwort, dryland ragwort, Elmer's butterweed
puberulent (hairs abundant, curly).
glabrous or glabrate.
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).
± evenly distributed (proximal often withering before flowering); petiolate or sessile;
blades ovate or lanceolate to narrowly lanceolate, (3–)6–12(–20) × (1–)1.5–5(–7) cm, bases tapered, margins usually pinnate to lacerate, sometimes dentate.
0 or 1–8+;
corolla laminae usually 1–2+ mm (barely surpassing phyllaries).
± 8;
corolla laminae 5–10 mm.
± 13 (± 21), 4–7+ mm, tips greenish or minutely black.
(± 8) ± 13, 3–8+ mm, tips green or black.
0 or of 1–5+ linear to filiform bractlets.
of 3–5+ (prominent or inconspicuous) bractlets (lengths to 3/4 phyllaries).
12–24 in corymbiform arrays.
10–60+ in compound corymbiform arrays.
hairy (especially on angles).
usually glabrous, sometimes hirtellous.
= 40.
= 38, 40, 44.
Senecio sylvaticus
Senecio eremophilus
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 3 (3 in the flora).
Varieties of Senecio eremophilus are distinguished by head size and distribution. Varieties eremophilus and macdougalii are notably different; var. kingii is intermediate in both morphology and distribution.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Calyculi: bractlets prominent (lengths of at least some to about 3/4 phyllaries); involucres 7–10 mm diam.; phyllaries 6–8 mm, tips green or weakly, if at all, black | var. eremophilus |
1. Calyculi: bractlets conspicuous or inconspicuous (lengths rarely to 1/2 phyllaries); involucres 5–8 mm diam.; phyllaries 3–6 mm, tips usually black | → 2 |
2. Calyculi: bractlets conspicuous (lengths to 1/2 phyllaries); involucres (5–)6–8 diam.; phyllaries ± 13, (4–)5–6 mm | var. kingii |
2. Calyculi: bractlets inconspicuous; involucres 4–5(–6) mm diam.; phyllaries ± 8 or ± 13, 3–5 mm | var. macdougalii |
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