Pacific Island Ecosystems at Risk (PIER)

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Phalaris brachystachys
Link, Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: short-spiked canarygrass

French: alpiste

Spanish: rabo de cordero

Habit:  grass

Description:  "Habit: Annual; caespitose. Culms erect, or geniculately ascending; 30-90 cm long. Ligule an eciliate membrane. Leaf-blades 10-20 cm long; 2-8 mm wide. Inflorescence a panicle. Panicle spiciform; ovate; 1.5-4 cm long; 0.8-1.8 cm wide. Spikelets solitary. Fertile spikelets pedicelled. Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; laterally compressed; compressed strongly; 6.3-8.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume elliptic; 6.3-8.5 mm long; 1 times length of upper glume; chartaceous; 1-keeled; winged on keel; winged above; 3 -veined. Lower glume surface glabrous, or pilose. Lower glume apex acute. Upper glume elliptic; 6.3-8.5 mm long; 1.4-1.5 times length of adjacent fertile lemma; chartaceous; 1-keeled; winged on keel; winged above; 3 -veined. Upper glume surface glabrous, or pilose. Upper glume apex acute. Florets: Basal sterile florets similar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret ovate; 0.6-1.2 mm long; 0.1-0.2 times length of fertile lemma; fleshy; acute. Fertile lemma elliptic; laterally compressed; 4.5-5.5 mm long; cartilaginous; shiny; keeled; 5 -veined. Lemma surface pubescent. Lemma apex acute. Palea cartilaginous; 2 -veined; without keels. Palea surface pubescent. Flower: Anthers 3. Ovary glabrous. Caryopsis with adherent pericarp; 3.5-3.9 mm long. Hilum linear"  (GrassBase).

Habitat/ecology:  In New Caledonia, "mauvaise herbe peu commune" (MacKee, 1994; p. 61).

Propagation:  Seed

Native range:  Macaronesia, northern Africa, Europe, western Asia (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
invasive
MacKee, H. S. (1994) (p. 61)
Voucher cited: MacKee 15722
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 192)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 12 FEB 2007 and was last updated on 30 NOV 2008.