Senecio sylvaticus

Linnaeus

Sp. Pl. 2: 868. 1753.

Introduced
Treatment appears in FNA Volume 20. Treatment on page 563. Mentioned on page 548.

Annuals, (15–) 30–80+ cm (taproots fibrous-rooted). Herbage puberulent (hairs abundant, curly). Stems 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). Heads 12–24 in corymbiform arrays. Calyculi 0 or of 1–5+ linear to filiform bractlets. Phyllaries ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. Ray-florets 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). Cypselae hairy (especially on angles). 2n = 40.


Phenology: Flowering late spring–summer (northern areas of cool, climate); winter (southern areas).
Habitat: Mildly disturbed woodlands, open, sandy sites
Elevation: 100–300 m

Distribution

V20-1255-distribution-map.gif

Introduced; B.C., N.B., Nfld. and Labr. (Nfld.), N.S., P.E.I., Que., Calif., La., Mass., Mich., N.J., Ohio, Oreg., Pa., Wash., Wis., Eurasia

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.

Selected References

None.

Lower Taxa

None.
... more about "Senecio sylvaticus"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
indeterminate +  and determinate +
Theodore M. Barkley† +
Linnaeus +
tapered +
7 cm70 mm <br />0.07 m <br /> (12 cm120 mm <br />0.12 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
obovate;oblong +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged;nerved;ribbed +
linear;filiform +
barbellulate +  and smooth +
white +  and stramineous +
purplish +, reddish +, white +, ochroleucous +, yellow +  and white rarely reddish +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
angled +, 5-ribbed +, prismatic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, P.E.I. +, Que. +, Calif. +, La. +, Mass. +, Mich. +, N.J. +, Ohio +, Oreg. +, Pa. +, Wash. +, Wis. +  and Eurasia +
100–300 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Mildly disturbed woodlands, open, sandy sites +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
turbinate;campanulate +
distributed +
cauline +  and basal +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
2-carpellate +
persistent +
Flowering late spring–summer (northern areas of cool, climate) +  and winter (southern areas). +
mostly oblong +  and lanceolate or linear +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
Introduced +
appendaged +  and truncate +
papillate +
Compositae +
Senecio sylvaticus +
species +
campanulate +
black +  and greenish +
denticulate +  and serrate or toothed +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
100 cm1,000 mm <br />1 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
shrub +  and subshrub +