Pacific Island Ecosystems at Risk (PIER)

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Amaranthus interruptus
R. Br., Amaranthaceae
No images for this taxon


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: amaranth

Marquesan: ea ea mata

Habit:  herb

Description:  "Erect or decumbent, from 6 in. to nearly 2 ft. high. Leaves petiolate, ovate or almost rhomboidal, obtuse, 1/2 in to near 2 in. long. Cymes or clusters dense or at length rather loose, the lower ones axillary, the upper ones forming a long loose spike leafy at the base, either simple or rarely with a few short branches. Bracts and bracteoles shorter than the perianth or about as long, scarcely pointed. Segments of the fruiting perianth 5, narrow, erect, slightly spathulate, shortly but finely pointed, about 3/4 line long, white and scarious on the margins, dark in the centre, those of the male flowers usually 3 only and not dilated upwards. Pericarp membranous, rugose, not ribbed, indehiscent or bursting irregularly, loose over the seed with a short thick summit about as long as the perianth. Styles 2 or rarely 3" (Bentham, 1866; p. 215).

Habitat/ecology:  In Australia (native), "Grows in vine thicket and monsoon forest on red stony basaltic soil, also in sandy and gravelly soil on rocky slopes and in riverbeds"  (Australia's Tropical Rainforest Plants).

Propagation:  Seed

Native range:  Australia, Indonesia (Lesser Sunda Islands), Papua New Guinea (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
French Polynesia
Marquesas Islands
Hiva Oa Island introduced
invasive
Florence, J. (2004) (pp. 60-61)
French Polynesia
Marquesas Islands
Hiva Oa Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Adventice
French Polynesia
Society Islands
Tahiti Island introduced
invasive
Florence, J. (2004) (pp. 60-61)
French Polynesia
Society Islands
Tahiti Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Adventice
New Caledonia
Récifs D'Entrecasteaux (D'Entrecasteaux Reefs)
Île Surprise introduced
MacKee, H. S. (1994) (p. 11)
Voucher cited: Blanchon 435 (NOU)
New Caledonia
Îles Loyauté (Loyalte Islands)
Îles Loyauté (Loyalty Islands) introduced
invasive
Tassin, Jacques (2005)
New Caledonia
Îles Loyauté (Loyalte Islands)
Île Lifou introduced
MacKee, H. S. (1994) (p. 11)
Voucher cited: Hoff 1419 (NOU)
New Caledonia
New Caledonia
New Caledonia Islands introduced
invasive
Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe (1996) (p. 379)
Rudérale, nombreuses localités
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
invasive
Tassin, Jacques (2005)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
MacKee, H. S. (1994) (p. 11)
Vouchers cited: Vieillard 1063 s.loc., Pancher, s.n., Balansa 1028, MacDaniels 2049, MacKee 18131, MacKee 26372
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) introduced
invasive
Womersley, John S., ed. (1978) (pp. 24-25)
Samoa
Western Samoa Islands
Western Samoa Islands   Swarbrick, John T. (1997) (p. 88)
Solomon Islands
Solomon Islands
Solomon Islands   Swarbrick, John T. (1997) (p. 88)
Solomon Islands
Solomon Islands
Solomon Islands native
Hancock, I. R./Henderson, C. P. (1988) (p. 46)
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)
Australia (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South Australia, Western Australia
Australia
Australia (continental)
Northern Territory native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Lesser Sunda Islands


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This page was created on 1 JAN 1999 and was last updated on 21 FEB 2013.