L., Asteraceae |
Present on Pacific Islands? yes
Primarily a threat at high elevations? no
Common name(s): [more details]
English: common groundsel, groundsel, old-man-in-the-Spring |
French: sénecon vulgaire |
Habit: herb
Description: "Annuals, (10-) 20-50 (-60+) cm (taprooted). Herbage glabrous or sparsely and unevenly tomentose when young. Stems usually 1. Leaves evenly distributed; petiolate; blades ovate to oblanceolate, 2-10 x 0.5-2 (-4) cm, bases tapered, margins lobulate to dentate, ultimate margins often secondarily dentate to denticulate (distal leaves sessile). Heads 8-20 in loose, corymbiform arrays. Calyculi of 2-4(-6+) bractlets (prominent, black-tipped, lengths about 1/4 phyllaries). Phyllaries ± 21, 4-6 mm, tips usually green, sometimes black. Ray florets 0. Cypselae usually sparsely hairy, sometimes nearly glabrous" (Flora of North America online).
Habitat/ecology: In North America, "disturbed sites; 1-1000 m. Particularly abundant in southern areas of cool damp winters or northern areas of cool damp summers" (Flora of North America online). In New Zealand, "waste places, cultivated land, gardens, riverbeds and stony sites, from coastal areas to 700 m" (Webb et al., 1988; p. 277). "In Chile this species grows in the following environmental conditions: Medium altitude up to the timber line; low altitude, interior valleys; coastal mountains, 500-2000 m; coastal areas, 0-500 m. Dry, arid areas, with long drought periods of 6-10 months, precipitations of 100-300 mm. are concentrated in winter; somewhat dry areas where the drought may last 3-5 months, precipitations of 400-800 mm. are concentrated in winter; humid areas, with almost constant rainfall, short dry periods are possible (generally not longer than 1 month). Fully exposed to the sun, level areas or slopes facing north; some shadow,s ome protection against direct sunlight, some shadow from vegetation, filtering about 20-40% of light" (Chileflora).
Propagation: Seed
Native range: Canary Islands, northern Africa, Europe, Asia; naturalized elsewhere, exact native range obscure (GRIN).
Presence:
Pacific | |||
Country/Terr./St. & Island group |
Location |
Cited status &
Cited as invasive & Cited as cultivated & Cited as aboriginal introduction? |
Reference &
Comments |
Chile (offshore islands)
Juan Fernández Islands |
Isla Más a Tierra (Robinson Crusoe Island) |
introduced
invasive |
Atkinson, Rachel/Sawyer, John (2011) |
Chile (offshore islands)
Juan Fernández Islands |
Isla Más a Tierra (Robinson Crusoe Island) |
introduced
invasive |
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557) |
Chile (offshore islands)
Juan Fernández Islands |
Isla Más Afuera (Alejandro Selkirk Island) |
introduced
invasive |
Atkinson, Rachel/Sawyer, John (2011) |
Chile (offshore islands)
Juan Fernández Islands |
Isla Más Afuera (Alejandro Selkirk Island) |
introduced
invasive |
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557) |
Chile (offshore islands)
Juan Fernández Islands |
Morro El Verdugo |
introduced
invasive |
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557) |
State of Hawaii
Hawaiian Islands |
Hawaii (Big) Island |
introduced
invasive |
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 356)
Voucher cited: Ewart III 178 (BISH) |
State of Hawaii
Hawaiian Islands |
Maui Island |
introduced
invasive |
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 356) |
Pacific Rim | |||
Country/Terr./St. & Island group |
Location |
Cited status &
Cited as invasive & Cited as cultivated & Cited as aboriginal introduction? |
Reference &
Comments |
Australia
Australia (continental) |
New South Wales |
introduced
invasive |
National Herbarium of New South Wales (2013)
"Weed of disturbed sites". |
Australia
Australia (continental) |
Australia (continental) |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
Australia
Australia (continental) |
Queensland |
introduced
invasive |
National Herbarium of New South Wales (2013)
"Weed of disturbed sites". |
British Columbia (province of Canada)
Province of British Columbia |
Canada (British Columbia) |
probably introduced
|
Flora of North America Editorial Committee, eds. (2013) |
China
China |
China (People's Republic of) |
native
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
Japan
Japan |
Japan |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honshu |
Japan
Japan |
Japan |
introduced
|
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 190) |
North Korea
North Korea |
North Korea (Democratic People's Republic of) |
native
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
South Korea
South Korea |
South Korea (Republic of) |
native
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
Mexico
Mexico |
Mexico (United Mexican States) |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
New Zealand
New Zealand |
New Zealand (country) |
introduced
invasive |
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 277) |
South America (Pacific rim)
South America (Pacific rim) |
Chile (Republic of) |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
South America (Pacific rim)
South America (Pacific rim) |
Chile (Republic of) |
introduced
invasive |
Belov, Michail (2013) |
South America (Pacific rim)
South America (Pacific rim) |
Colombia |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
South America (Pacific rim)
South America (Pacific rim) |
Ecuador (Republic of) (continental) |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
South America (Pacific rim)
South America (Pacific rim) |
Perú (Republic of) |
introduced
|
U.S. Dept. Agr., Agr. Res. Serv. (2013) |
Taiwan
Taiwan Island |
Taiwan Island |
Ching-I Peng, ed. (2013)
Around villages, 2,000-2,500 m. |
|
United States (west coast)
United States (west coast states) |
USA (Oregon) |
probably introduced
|
Flora of North America Editorial Committee, eds. (2013) |
United States (west coast)
United States (west coast states) |
USA (California) |
probably introduced
|
Flora of North America Editorial Committee, eds. (2013) |
United States (west coast)
United States (west coast states) |
USA (Washington) |
probably introduced
|
Flora of North America Editorial Committee, eds. (2013) |
Also reported from | |||
Country/Terr./St. & Island group |
Location |
Cited status &
Cited as invasive & Cited as cultivated & Cited as aboriginal introduction? |
Reference &
Comments |
Canada
Canada |
Canada |
probably introduced
|
Flora of North America Editorial Committee, eds. (2013) |
United States (continental except west coast)
United States (other states) |
United States (other states) |
introduced
|
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013) |
United States (continental except west coast)
United States (other states) |
USA (Florida) |
probably introduced
|
Flora of North America Editorial Committee, eds. (2013) |
Control: If you know of control methods for Senecio vulgaris, please let us know.