Spiraea cantoniensis Lour., Rosaceae

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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)

Common name(s): [more details]

Chinese: mao ye xiu xian ju

English: Reeve's spiraea, Reeves' meadowsweet

Japanese: ko-demari

Habit:  shrub

Description:  "Shrubs to 1.5 m tall. Branchlets arching, dark red-brown, turning gray-brown when old, slender, terete, glabrous or pubescent; buds ovoid, small, with several scales, glabrous or puberulous apically or on scale margins. Petiole 4-7 mm, glabrous; leaf blade gray-blue abaxially, dark green adaxially, rhombic-lanceolate to rhombic-oblong, 2-8 x 0.7-2 cm, glabrous or abaxially pubescent, pinnately veined, base cuneate, margin incised serrate above middle, apex acute. Umbels pedunculate, 3-4 x 2-3.5 cm, many flowered; rachis and pedicels glabrous or pubescent; pedicels 8-14 mm; bracts linear to lanceolate, 2-3 mm, glabrous or pubescent. Flowers 5-7 mm in diameter. Hypanthium campanulate, glabrous or abaxially pubescent. Sepals triangular or ovate-triangular, 1-1.5 x 1.5-2 mm, erect in fruit, apex acute or shortly acuminate. Petals white, suborbicular or obovate, 2.5-4 x 3-4.5 mm, apex emarginate or obtuse. Stamens 20-28, slightly shorter than to nearly equaling petals. Disk annular, lobed; lobes unequal, suborbicular, apex emarginate. Styles shorter than stamens. Follicles straightly spreading, glabrous; styles terminal, usually divergent"  (Flora of China online).

Habitat/ecology:  In China (native and widely cultivated), "slopes; 200-300 m"  (Flora of China online).  In scrub in New Zealand.  "Widely cultivated as an ornamental and is one of the commonest persistent relics of cultivation in old garden sites"  (Webb et al., 1988; p. 1141).

Propagation:  Seed

Native range:  China, 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	Kaua‘i Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1991) (voucher ID: PTBG 14690) Taxon name on voucher: Spiraea cantoniensis Lour. var. lanceata Zabel
State of Hawaii Hawaiian Islands	Maui Island		Bishop Museum (U.S.A. Hawaii. Honolulu.) (1999) (voucher ID: BISH 661873) Taxon name on voucher: Spiraea cantoniensis Lour.
State of Hawaii Hawaiian Islands	O‘ahu Island		Bishop Museum (U.S.A. Hawaii. Honolulu.) (1986) (voucher ID: BISH 534028) Taxon name on voucher: Spiraea cantoniensis Lour.
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced cultivated	MacKee, H. S. (1994) (p. 122) Vouchers cited: Baumann 15658, MacKee 22576

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)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013) Fujian, Guangdong, Guangxi, Hunan, Jiangxi, Zhejiang
China China	China (People's Republic of)	native	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Japan Japan	Japan		Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
New Zealand New Zealand	New Zealand (country)	introduced invasive cultivated	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 1141)

Also reported from
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
United States (continental except west coast) United States (other states)	United States (other states)	introduced	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013) Alabama, Arkansas, Louisiana, North Carolina, New York, Virginia

Control:  If you know of control methods for Spiraea cantoniensis, please let us know.