Pacific Island Ecosystems at Risk (PIER)

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Hydrangea macrophylla
(Thunb.) Ser., Hydrangeaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Hortensia opuloides Lam.; Hydrangea chungii Rehder; Hydrangea hortensia Siebold; Hydrangea opuloides (Lam.) K. Koch; Viburnum macrophyllum Thunb.

Common name(s): [more details]

English: French hydrangia, hortensia, hydrangea, lacecap hydrangea, tea-of-heaven

French: hortensia à grandes feuilles

Hawaiian: pōpōhau

Japanese: ajisai, gaku-ajisai

Habit:  herb

Description:  "Deciduous, densely-branched, rounded shrub to 1.5-(3) m high; twigs glabrous and flexible, becoming mottled and brittle. Leaves towards ends of branches on younger wood; petiole short; lamina elliptic to ovate or obovate, (5)-10-20 x (3)-5-15 cm, acuminate, cuneate, coarsely serrate; both surfaces glabrous and greasy, the upper lustrous, the lower dull with a conspicuous network of veins. Corymb broad, flat-topped or convex, much-branched, hairy, up to 20 cm in diameter, usually largely composed of sterile flowers, sometimes with an outer ring of sterile flowers and central flowers fertile. Sepals of sterile flowers petaloid, spreading, broad-elliptic to obovate, 1-2 cm long, pink, blue, white, or greenish. Corolla c. 3 mm in diameter; petals minute and incurved, pink or blue. Stamens 10. Ovary enclosed in calyx tube at anthesis, later projecting. Capsule 5 mm long"  (Webb et al., 1988; p. 757).

Habitat/ecology:  In New Zealand, "regions of moderate to high rainfall, mostly wasteland, scrub, and forest margins, also coastal habitats.  Hydrangea is frequent as a long-persistent relict or as deliberate plantings on forest margins in wetter parts of New Zealand; some forms also set seed and have established as small wild populations"  (Webb et al., 1988; p. 757).

Propagation:  Seed

Native range:  Japan; also cultivated and naturalized (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
cultivated
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
invasive
cultivated
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 486, 532, 554)
"Presente en jardines del pueblo de San Juan Bautista, se encuentra también fuera de ellos (Plazoleta del Yunque). Esta especie debe ser vigilada muy de cerca y seria prudente suprimir los ejemplares que crecen fuera de los jardines".
Ecuador (Galápagos Islands)
Isabela Group
Isabela Island introduced
cultivated
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
San Cristóbal Group
San Cristóbal Island introduced
cultivated
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz Island introduced
cultivated
Charles Darwin Foundation (2008)
Federated States of Micronesia
Kosrae Island
Kosrae Island introduced
cultivated
Lorence, David H./Flynn, Timothy (2010) (p. 18)
French Polynesia
Marquesas Islands
Nuku Hiva (Nukahiva) Island introduced
cultivated
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Cultivée
French Polynesia
Society Islands
Tahiti Island introduced
cultivated
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Cultivée
French Polynesia
Austral (Tubuai) Islands
Raivavae (Raevavae) Island introduced
cultivated
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Cultivée
French Polynesia
Austral (Tubuai) Islands
Rurutu Island introduced
cultivated
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Cultivée
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (1990) (voucher ID: BISH 553607)
Taxon name on voucher: Hydrangea macrophylla subsp. macrophylla
State of Hawaii
Hawaiian Islands
Kaua‘i Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (1986) (voucher ID: BISH 524408)
Taxon name on voucher: Hydrangea macrophylla subsp. macrophylla
Japan (offshore islands)
Ogasawara (Bonin) Islands
Bonin (Ogasawara) Islands introduced
Kato, Hidetoshi (2007)
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)
"Various cultivars commonly cultivated as garden ornamental shrubs; rarely naturalised".
Central America
Central America (Pacific rim)
Guatemala (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Central America
Central America (Pacific rim)
Nicaragua (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
China
China
China (People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
Hong Kong introduced
cultivated
Wu, Te-lin (2001) (p. 122)
Ornamental.
Japan
Japan
Japan (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honshu
New Zealand
New Zealand
New Zealand (country) introduced
invasive
cultivated
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 757)
South America (Pacific rim)
South America (Pacific rim)
Perú (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
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
Comité français de l'Union Internationale pour la Conservation de la Nature en France (2013)
envahissant


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This page was created on 16 DEC 2010 and was last updated on 8 MAY 2013.