Pacific Island Ecosystems at Risk (PIER)

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Amblyopappus pusillus
Hook. & Arn., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: amblyopappus, dwarf coastweed, pineapple weed

Habit:  herb

Description:  "Annual 3-40 cm, glabrous or glandular, sticky; odor strong.  Stem erect, simple or much-branched.  Leaves simple, alternate or lowermost opposite, 1-4 cm, linear to narrowly oblanceolate, entire or pinnately lobed ± fleshy.  Inflorescence: heads disciform or minutely radiate, many in a round- or flat-topped, leafy cyme; peduncles generally 1-6 mm; involucre 3-6 mm in diameter, bell-shaped; phyllaries 3-8, in 1 series, equal, free, overlapping, 2-5 mm, obovate; receptacle short-naked. Pistillate flowers 1 per phyllary; corollas 0.5-1 mm, tubular, yellow, ligules minute, 2-3-lobed.  Disk flowers 2-30; corollas 0.5-1 mm, yellow; style branches very short, tip triangular.  Fruit 1.5-2 mm, obconic, 3-4 angled, black; hairs short, ascending; pappus a crown of 7-12 scales, each 0.2-0.5 mm, oblong, blunt, white or purplish"  (Jepson Manual online).

"Leaves 1-3+ cm, often ± fleshy. Ray or pistillate corollas 0.6-1 mm (obscurely zygomorphic). Disc corollas 0.6-1 mm. Cypselae black, 1.5-2 mm; pappi of white or purplish, apically ± muticous scales 0.5-0.8 mm"  (Flora of North America online).

Habitat/ecology:  "Coastal bluffs, dunes, beaches; 0-40+ m"  (Flora of North America online).

Propagation:  Seed

Native range:  U.S. (California), Mexico (Baja California), South America  (Flora of North America online).

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
Skottsberg, Carl (1953) (p. 225)
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. 551)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Skottsberg, Carl (1953) (p. 225)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 551)
Chile (offshore islands)
Juan Fernández Islands
Morro El Verdugo introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 551)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Chile (continental)
Chile
Chile (Republic of)   Skottsberg, Carl (1953) (p. 225)
Mexico
Mexico
Mexico (United Mexican States) native
Flora of North America Editorial Committee, eds. (2013)
Baja California
United States (west coast)
United States (west coast states)
USA (California) native
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 15 DEC 2010 and was last updated on 29 DEC 2010.