Pacific Island Ecosystems at Risk (PIER)

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Briza subaristata
Lam., Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Briza stricta (Hook. & Arn.) Steud.; Briza subaristata var. interrupta (Hack. ex Stuck.) Roseng. et al.; Briza triloba Nees; Chascolytrum subaristatum (Lam.) Desv.

Habit:  grass

Description:  "Perennial; caespitose. Basal innovations extravaginal. Culms erect; 30-60 cm long; 2 -noded. Culm-nodes glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5-3 mm long. Leaf-blades flat, or involute; 6-25 cm long; 1.5-4 mm wide. Leaf-blade midrib scarcely raised beneath. Leaf-blade surface ribbed; glabrous. Inflorescence a panicle. Panicle open, or contracted; lanceolate, or elliptic; 2.5-15 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-7 mm long; pubescent. Fertile spikelets: Spikelets comprising 6-11 fertile florets; with diminished florets at the apex. Spikelets orbicular; laterally compressed; 3.5-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.1-0.4 mm long. Glumes persistent; similar; shorter than spikelet. Lower glume orbicular; 1.5-3.1 mm long; 1 length of upper glume; membranous; 1-keeled; 3-7 -veined. Lower glume surface puberulous. Lower glume apex acute. Upper glume orbicular; 1.5-3.3 mm long; 0.66-0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface puberulous. Upper glume apex acute. Florets: Fertile lemma oblate; auriculate at base; 1.8-5 mm long; 1.8-5 mm wide; coriaceous; much thinner on margins; mid-green; keeled; winged on margins; 5 -veined. Lemma apex dentate; 2 -fid; muticous, or awned; 1 -awned. Principal lemma awn from a sinus; 0.5-1 mm long overall. Palea orbicular; 1-2.5 mm long; coriaceous; 2 -veined. Apical sterile florets resembling fertile though underdeveloped. Flower: Lodicules 2; cuneate; 0.3-0.6 mm long; membranous; truncate. Anthers 1; 0.8-1.1 mm long. Ovary glabrous. Caryopsis with adherent pericarp; orbicular; 1-1.5 mm long. Hilum punctiform"  (GrassBase).

Habitat/ecology:  In Australia, "grows in long-established low-fertile soils but not disturbed pastures"  (New South Wales PlantNET).

Propagation:  Seed

Native range:  Southern South America (GRIN).

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
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)
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)
New South Wales introduced
invasive
National Herbarium of New South Wales (2013)
"Grows in long-established low-fertile soils but not disturbed pastures".
Chile (continental)
Chile
Chile (Republic of) native
U.S. Dept. Agr., Agr. Res. 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 8 FEB 2011 and was last updated on 3 APR 2011.