Pyracantha koidzumii Rehd., Rosaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  yes

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

Other Latin names:  Cotoneaster koidzumii Hayata

Common name(s): [more details]

Chinese: tai wan huo ji

English: Formasa firethorn

Habit:  shrub

Description:  "Shrubs caespitose. Branchlets dark gray, often thornlike, initially pubescent, glabrous when old. Leaves usually 3-5-fascicled; petioles ca. 3 mm, puberulous; leaf blade narrowly elliptic to narrowly obovate, 3-4.5 x 0.7-1.2 cm, abaxially glaucescent, densely pubescent when young, glabrescent, adaxially glabrous, base cuneate, margin entire, apex slightly emarginate or truncate. Corymb 3-4 cm in diameter, many flowered; peduncle sparsely pubescent; bracts caducous, lanceolate. Pedicel 5-11 mm, sparsely pubescent. Flowers 8-10 mm in diameter. Hypanthium campanulate, abaxially densely pubescent. Sepals triangular, 1-1.2 mm, abaxially densely pubescent when young, apex acute. Petals suborbicular or broadly elliptic, 3.5-4 x 3-4 mm, apex slightly emarginate. Stamens 20; filaments 2-3 mm. Ovary pubescent; styles nearly as long as stamens. Pome orangish red, depressed-globose, 4-5 mm"  (Flora of China online).

Habitat/ecology:  In Taiwan (native), "rocky valley areas, seashores, thickets, among shrubs"  (Flora of China online).

Propagation:  Seed, spread by birds (Staples, Herbst & Imada, 2000, p. 28).

Native range:  Taiwan (GRIN).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced cultivated	Charles Darwin Foundation (2008)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive cultivated	Herbarium Pacificum Staff (1999) (pp. 9-10) Voucher cited: W. L. Wagner, S. Mill, T. Flynn & R. Gustafson 5267 (BISH)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive cultivated	Herbarium Pacificum Staff (1999) (pp. 9-10) Voucher cited: J. Plews s.n. (BISH 523723)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced cultivated	Herbarium Pacificum Staff (1999) (pp. 9-10)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2003) (p. 31) East Maui. Voucher cited: Starr & Martz 000831-7 (BISH)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced cultivated	Herbarium Pacificum Staff (1999) (pp. 9-10)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced cultivated	MacKee, H. S. (1994) (p. 121) Voucher cited: MacKee 42847

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Taiwan Taiwan Island	Taiwan Island	native	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) Rocky valley areas, seashores, thickets, among shrubs.

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, Arizona, Mississippi, South Carolina
United States (continental except west coast) United States (other states)	USA (Florida)	introduced	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)

Control:  If you know of control methods for Pyracantha koidzumii, please let us know.