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
Mexico Mexico	Mexico (United Mexican States)	native	Flora of North America Editorial Committee, eds. (2013) Baja California
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)		Skottsberg, Carl (1953) (p. 225)
United States (west coast) United States (west coast states)	USA (California)	native	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)

Control:  If you know of control methods for Amblyopappus pusillus, please let us know.