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. (2011) Baja California
United States (west coast) United States (west coast states)	USA (California)	native	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2011)

Additional information:
Additional online information about Amblyopappus pusillus is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Amblyopappus pusillus as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Amblyopappus pusillus may be available from the Germplasm Resources Information Network (GRIN).

References:

Atkinson, Rachel/Sawyer, John. 2011. Naturalized species in the Juan Fernández Archipelago, Chile. Unpublished spreadsheet.

Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido. 2006. Nouveau catalogue de la flore vaculaire de l'archipel Juan Fernández (Chile) [Nuevo catálogo de la flora vacular del Archipélago Juan Fernández (Chile)]. Acta Bot. Gallica 153(4):399-587.

Flora of North America Editorial Committee, eds. 2011. Flora of North America North of Mexico (online edition).

Hickman, J. C. 1993. The Jepson manual: higher plants of California. U. Cal. Press, Berkeley. 1400 pp.

Skottsberg, Carl. 1953. The natural history of Juan Fernandez and Easter Island. Vol. II, Botany. Almqvist &l; Wiksells, Uppsala. 960 pp.

U. S. Government. 2011. Integrated Taxonomic Information System (ITIS) (on-line resource).

U.S. Dept. Agr., Nat. Res. Cons. Serv. 2011. The PLANTS Database. National Plant Data Center, Baton Rouge, LA 70874-4490 USA.