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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort

Clark's ragwort

Habit Annuals, (15–)30–80+ cm (taproots fibrous-rooted). Perennials, (50–)60–100(–120) cm (caudices fibrous-rooted).
Herbage

puberulent (hairs abundant, curly).

sparsely floccose-tomentose, unevenly glabrescent.

Stems

single.

single.

Leaves

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; petiolate;

well-developed mid leaves: blades lanceolate to oblong,(8–)10–15(–18) × (2–)3–5(–9) cm overall, margins deeply dentate or irregularly pinnate-lobed to laciniate;

distal leaves sessile, weakly clasping.

Ray florets

0 or 1–8+;

corolla laminae usually 1–2+ mm (barely surpassing phyllaries).

± 8 or ± 13;

corolla laminae 8–12(–20) mm.

Phyllaries

± 13 (± 21), 4–7+ mm, tips greenish or minutely black.

± 13 or ± 21, 5–8 mm, tips green.

Calyculi

0 or of 1–5+ linear to filiform bractlets.

of 3–8+ linear to filiform bractlets (lengths 1/2–3/4+ phyllaries).

Heads

12–24 in corymbiform arrays.

8–20 in corymbiform arrays.

Cypselae

hairy (especially on angles).

glabrous.

2n

= 40.

Senecio sylvaticus

Senecio clarkianus

Phenology Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). Flowering late summer.
Habitat Mildly disturbed woodlands, open, sandy sites Moist meadows, conifer-dominated sites
Elevation 100–300 m (300–1000 ft) 1400–2700 m (4600–8900 ft)
Distribution
from FNA
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)

Senecio clarkianus grows on west slopes of the central and southern Sierra Nevada.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 563. FNA vol. 20, p. 566.
Parent taxa Asteraceae > tribe Senecioneae > Senecio 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. squalidus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
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. 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. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
Name authority Linnaeus: Sp. Pl. 2: 868. (1753) A. Gray: Proc. Amer. Acad. Arts 7: 362. (1868)
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