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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort

Sacramento ragwort

Habit Annuals, (15–)30–80+ cm (taproots fibrous-rooted). Perennials, 20–50 cm (caudices fibrous-rooted).
Herbage

puberulent (hairs abundant, curly).

sparsely pubescent to tomentose (especially on abaxial leaf faces and among heads).

Stems

single.

single or loosely clustered.

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).

progressively reduced distally; petiolate;

blades triangular, triangular-lanceolate, or lanceolate, 3–10(–15) × 1.5–4 cm, bases cordate to truncate or tapered, margins serrate or dentate (mid and distal leaves sessile, bractlike).

Ray florets

0 or 1–8+;

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

0.

Phyllaries

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

± 8, 6–9 mm, tips green.

Calyculi

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

of 2–5+ lance-deltate to filiform bractlets (lengths 1/5–1/2 phyllaries).

Heads

12–24 in corymbiform arrays.

nodding, 6–10+ in racemiform-paniculiform arrays.

Cypselae

hairy (especially on angles).

glabrous.

2n

= 40.

Senecio sylvaticus

Senecio sacramentanus

Phenology Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). Late summer.
Habitat Mildly disturbed woodlands, open, sandy sites Montane meadows
Elevation 100–300 m (300–1000 ft) 3000–3500 m (9800–11500 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
NM
[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.)

Source FNA vol. 20, p. 563. FNA vol. 20, p. 550.
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. 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. 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) Wooton & Standley: Contr. U.S. Natl. Herb. 16: 194. (1913)
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