Pacific Island Ecosystems at Risk (PIER)

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Argemone ochroleuca
(dummy value for TaxonCode Authority; this value should be replaced!!).......Papaveraceae


English: Mexican poppy, pale Mexican poppy, prickly poppy, white thistle, white-flower Mexican-poppy, yellow poppy

Spanish: chicalote

"Annual herb to 1 m tall; sap yellow.  Stems erect, pithy, covered with stiff yellow prickles.  Leaves in a basal rosette when young; stem leaves alternate, light green to blue-green mottled with white, irregularly toothed or lobed with prickles at the tips, margins wavy.  Flowers solitary at the end of the branchlets, pale yellow, 3-7 cm diameter.  Fruit a prickly capsule, 2-5 cm long, opening at the top.  Seeds brown or black, globular, 1.5 mm diameter" (Smith, 2002; p. 58). In Australia, "found in seasonal creeks, stream beds, drainage lines and disturbed areas. Competes with native species especially in seasonal creeks and riverbeds. It can restrict movement of animals and cause injury due to its spiny nature." (Smith, 2002; p. 58).  "Grassland, stream beds and alluvial flats of ephemeral streams, disturbed places.  Where invasive, it forms large and dense populations that affect wildlife movement and crowd out native vegetation"  (Weber, 2003; p. 55). "Seeds produced in large numbers tend to fall near the parent plant producing dense stands. Seeds float and can be moved by water flow. The seed is also dispersed in mud adhering to vehicles, machinery and stock. The plant is known to break off at the base and be blown long distances helping to spread the seed. Seed has also been dispersed as a contaminant in hay and pasture seed." (Smith, 2002; p. 58). Central America, now widespread in warm areas of the world (Smith, 2002; p. 58). Mexico (GRIN).
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)
Northern Territory introduced
invasive
Smith, Nicholas M. (2002) (p. 58)
Australia
Australia (continental)
Queensland introduced
invasive
Smith, Nicholas M. (2002) (p. 58)
Mexico
Mexico
Mexico (United Mexican States) native
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. 927)
"Sporadic in waste places, fields, often associated with fowl runs or fowl manure".
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Mascarene Islands
Mascarene Islands (Mauritius, La Reunion, Rodrigues)
Mascarene Islands introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
A declared noxious weed in Western Australia and the Northern Territory (Smith, 2002; p. 58). "Control should aim at preventing seed formation.  Plants can be hand pulled, grubbed or cut before fruits ripen.  Seedlings can be sprayed or mowed"

Chemical:  "Effective herbicides are 2,4-D ester, 2,4-D amine, or glyphosate" (Weber, 2003; p. 55).


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