Pacific Island Ecosystems at Risk (PIER)

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Ruellia squarrosa
(Fenzl) Cuf., Acanthaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 7 (Go to the risk assessment).

Other Latin names:  Dipteracanthus squarrosus Fenzl

Habit:  shrub

Description:  "Sprawling perennial shrub with branches to 60 cm long, densely white-pilose (some hairs with small glandular apex). Leaf blades ovate to narrow-ovate, to 6 cm long and 2 cm wide, attenuate at base, entire, acute apically; younger leaves densely white-pilose, sparser with age; petioles to 2 cm long. Inflorescence axillary, solitary; bracteoles linear, 4.5-9 mm long, much shorter than calyx, pubescence as on stems and leaves but usually glandular. Flowers on pedicel to 1 mm long; calyx 10-16 mm long, with linear lobes joined only at the very base, reflexed after fruit is lost; corolla blue, finely pubescent externally on tube, throat and veins of lobes; tube c. 25 mm long; throat c. 12 mm long, curved slightly; lobes c. 15 mm long, more or less equal. Stamens with filaments c. 10 and 14 mm long. Stigma very unequally 2-lobed. Capsule 12-15 mm long, glabrous, 16-20-seeded, very shortly stipitate; seed c. 2 mm in diameter, thickened rim with mucilaginous hairs"  (PlantNET:  New South Wales Flora Online).

Habitat/ecology:  (no habitat/ecology info known by PIER)

Propagation:  Seed

Native range:  "Mexico (Veracruz) [possibly native here if Wasshausen's view is correct]"; cultivated elsewhere (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
O‘ahu Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (1960) (voucher ID: BISH 20089)
Taxon name on voucher: Ruellia squarrosa (Fenzl) Cuf.
State of Hawaii
Hawaiian Islands
O‘ahu Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (2001) (voucher ID: BISH 771824)
Taxon name on voucher: Ruellia squarrosa (Fenzl) Cuf.
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
cultivated
MacKee, H. S. (1994) (p. 9)
Voucher cited: MacKee 21262
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
cultivated
National Herbarium of New South Wales (2013)
Australia
Australia (continental)
Queensland introduced
invasive
National Herbarium of New South Wales (2013)
"Naturalised in SE Qld (as a garden escape)&uot;.
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 189)
Mexico
Mexico
Mexico (United Mexican States) possibly native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Veracruz
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
La Réunion (France)
La Réunion Island
La Réunion Island introduced
invasive
Meyer, Jean-Yves/Lavergne, Christophe (2004) (p. 346)


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This page was created on 10 AUG 2011 and was last updated on 19 AUG 2011.