Flora of North America species comparison

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Senecio sylvaticus

Senecio ertterae

heath groundsel, wood groundsel, woodland groundsel, woodland ragwort

ertter's groundsel, ertter's ragwort
Habit Annuals, (15–)30–80+ cm (taproots fibrous-rooted). Annuals, 20–50(–60+) cm (taproots relatively thin, twisted).
Herbage

puberulent (hairs abundant, curly).

(± turgid or subsucculent) unevenly villous-tomentose, glabrescent.
Stems

single.

usually single, rarely 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 (basal usually withering before flowering); petiolate (petioles winged);

blades oblanceolate to spatulate, 4–7 × 1.5–3 cm, bases tapered, margins incised (distal leaves sessile, bractlike).
Ray florets

0 or 1–8+;

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

± 8 (± 13?);

corolla laminae 5–6 mm.
Phyllaries

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

± 13, 6–7 mm, tips green.
Calyculi

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

of 1–5+ linear to subulate bractlets (to 4 mm).
Heads

12–24 in corymbiform arrays.

6–10(–20) in cymiform arrays.
Cypselae

hairy (especially on angles).

usually hairy (especially on angles), sometimes glabrous.
2n

= 40.

= 40.

Senecio sylvaticus

Senecio ertterae
Phenology Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). Flowering late summer–early fall.
Habitat Mildly disturbed woodlands, open, sandy sites Talus slopes of greenish yellow ash tuff
Elevation 100–300 m (300–1000 ft) 900–1200 m (3000–3900 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
OR
[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.)

Of conservation concern.

Senecio erterrae is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 563. FNA vol. 20, p. 561.
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. 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) T. M. Barkley: in N. L. Britton et al., N. Amer. Fl., ser. 2, 10: 124. (1978)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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