Pacific Island Ecosystems at Risk (PIER)

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Rhododendron indicum
(Linnaeus) Sweet, Ericaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Evaluate, score: 4 (Go to the risk assessment)

Other Latin names:  Azalea indica L.

Common name(s): [more details]

Chinese: gao yue du juan

Habit:  shrub

Description:  "Much-branched shrub, usually low and prostrate, though sometimes up to 2 m; young shoots covered with adpressed flattened chestnut-brown setose hairs.  Leaves dimorphic, chartaceous; spring leaves narrowly lanceolate to oblanceolate, 2-3 x 0.8 -1 cm, 2.3-3 x as long as broad, apex acute, base cuneate, margin remotely crenate-serrulate, ciliate, upper surface with scattered bristles, lower surface paler, with setose bristles restricted to midrib; summer leaves 10-18 x 3-5 mm, otherwise as for spring leaves; petioles 2-4 mm, clothed with adpressed chestnut-brown setose hairs.  Inflorescence 1-2-flowered; pedicels 5-10 mm, clothed with brown strigose hairs.  Calyx with brown strigose hairs, especially on lobe margins, lobes ovate to orbicular, c. 1 mm long.  Corolla broadly funnel-shaped, bright red to scarlet, occasionally rose-red, 30-50 mm; tube half the length of corolla, glabrous.  Stamens 5, as long as or slightly exceeding the corolla, filaments scabrid below.  Ovary densely covered with adpressed shining brown hairs; style glabrous.  Capsule oblong-ovoid, c. 10 mm long, densely strigose" (Chamberlain & Rae, 1990; pp. 119-120).

Habitat/ecology:  In Japan, "wooded river banks, etc.; also widely cultivated and sometimes escaping" (Chamberlain & Rae, 1990; pp. 119-120).

Propagation:  Seed

Native range:  Japan (S. and W. Honshu, Kyushyu) (Chamberlain & Rae, 1990; pp. 119-120).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Nauru
Nauru Island
Nauru Island introduced
cultivated
Thaman, R. R./Fosberg, F. R./Manner, H. I./Hassall, D. C. (1994) (p. 125)
Rhododendron sp., rare, planted ornamental.
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
China
China
China (People's Republic of) introduced
cultivated
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Widely cultivated in China.
Japan
Japan
Japan (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore
Singapore
Singapore (Republic of) introduced
cultivated
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 75)
Cultivated only
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia (Indian Ocean offshore islands)
Christmas Island Group
Christmas Island introduced
cultivated
Swarbrick, J. T. (1997) (p. 125)


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

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This page was created on 10 FEB 2005 and was last updated on 16 DEC 2006.