Flora of North America species comparison

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Senecio cannabifolius

Senecio sylvaticus

Aleutian ragwort

heath groundsel, wood groundsel, woodland groundsel, woodland ragwort
Habit Perennials, (50–)100–150+ cm (rhizomes fibrous-rooted). Annuals, (15–)30–80+ cm (taproots fibrous-rooted).
Herbage

unevenly tomentose, glabrescent, except persistently hairy on abaxial faces of leaves.

puberulent (hairs abundant, curly).
Stems

single.

single.
Leaves

± evenly distributed (basal and proximal withering before flowering); mostly petiolate (proximal);

blades oblong or ovate to oblong-lanceolate (pinnately or subpalmately parted, primary lobes 3–6+, lanceolate to lance-linear, 3–8+ cm), 10–20+ × 8–15+ cm, bases ± tapered, ultimate margins serrate (distal leaves similar, sessile, smaller).

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).
Ray florets

± 5;

corolla laminae ca. 10 mm.

0 or 1–8+;

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

± 13, 4–6 mm, tips green.

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

0 or of 1–5+ subulate bractlets (lengths about 1/3 phyllaries).

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

20–50 in corymbiform arrays.

12–24 in corymbiform arrays.
Cypselae

glabrous.

hairy (especially on angles).
2n

= 40.

= 40.

Senecio cannabifolius

Senecio sylvaticus
Phenology Flowering summer. Flowering late spring–summer (northern areas of cool, climate); winter (southern areas).
Habitat Open meadows and slopes Mildly disturbed woodlands, open, sandy sites
Elevation 0–100 m (0–300 ft) 100–300 m (300–1000 ft)
Distribution
from FNA
AK; Eurasia
[BONAP county map]
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]
Discussion

Senecio cannabifolius barely enters the flora from far-eastern Asia. Infraspecific taxa are recognized within S. cannabifolius in some floras of Asiatic regions; our plants are referable to var. cannabifolius.

Senecio cannabifolius has been treated in Jacobaea by E. Wiebe (2000); see discussion under 53. S. jacobaea.

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

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. 569. FNA vol. 20, p. 563.
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. 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. sylvaticus, 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. 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
Synonyms Jacobaea cannabifolia, S. palmatus
Name authority Lessing: Linnaea 6: 242. (1831) Linnaeus: Sp. Pl. 2: 868. (1753)
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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