Senecio viscosus

Linnaeus

Sp. Pl. 2: 868. 1753.

Introduced
Treatment appears in FNA Volume 20. Treatment on page 562. Mentioned on page 546, 548.

Annuals, (10–) 20–40 (–60) cm (taprooted). Herbage densely fetid-viscid (hairs glandular). Stems single. Leaves evenly distributed; petiolate; blades obovate to oblong (pinnately dissected to pinnatifid), 2–7 × 1.5–4 cm, bases tapered or ± truncate, ultimate margins wavy or crenate-dentate (distal leaves sessile, smaller, ± clasping). Heads (1–) 3–8 (–30) in irregular, corymbiform arrays. Calyculi of 2–5 bractlets (largest to 4 mm). Phyllaries (± 13) ± 21, 5–7 mm, tips black. Ray-florets ± 13; corolla laminae 1–2 mm (usually coiled, scarcely surpassing phyllaries). Cypselae usually glabrous, sometimes hairy. 2n = 40.


Phenology: Flowering spring–fall.
Habitat: Disturbed sites, especially open sandy or gravelly places
Elevation: 1–300 m

Distribution

V20-1252-distribution-map.gif

Introduced; St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Conn., Ill., Maine, Mass., Minn., N.H., N.J., N.Y., Pa., R.I., Wis., Eurasia

Discussion

Senecio viscosus is a smelly, Eurasian weed now widely scattered in areas of cool damp climates, often as a casual waif. The viscid hairs trap wind-blown particles of sand, dust, and soot, which give the surfaces varying textures and colors.

Selected References

None.

Lower Taxa

None.
... more about "Senecio viscosus"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
indeterminate +  and determinate +
Theodore M. Barkley† +
Linnaeus +
truncate +  and tapered +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
obovate;oblong +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
winged;nerved;ribbed +
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 />) +
hairy +  and glabrous +
angled +, 5-ribbed +, prismatic +  and cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Conn. +, Ill. +, Maine +, Mass. +, Minn. +, N.H. +, N.J. +, N.Y. +, Pa. +, R.I. +, Wis. +  and Eurasia +
1–300 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Disturbed sites, especially open sandy or gravelly places +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
fetid-viscid +
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 spring–fall. +
mostly oblong +  and lanceolate or linear +
0.5 cm5 mm <br />0.005 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 viscosus +
species +
campanulate +
crenate-dentate +  and wavy +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
100 cm1,000 mm <br />1 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
shrub +  and subshrub +