Pinus strobus L., Pinaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  yes

Risk assessment results:  High risk, score: 9 (Go to the risk assessment).

Common name(s): [more details]

Chinese: bei mei qiao song

English: Weymouth pine, eastern white pine, northern white pine, soft pine, strobus pine, white pine

French: pin à aiguilles fines, pin Weymouth, pin blanc, pin blanc d'Amérique, pin blanc de l'Est, pin de Lord Weymouth

Japanese: sutoroobu matsu, sutoroobusu matsu

Spanish: pimobete blanco, pino blanco Americano, pino de Quebec, pino de Weymouth

Habit:  tree

Description:  "Trees to 67 m; trunk to 1.8m in diameter, straight; crown conic, becoming rounded to flattened. Bark gray-brown, deeply furrowed, with long, irregularly rectangular, scaly plates. Branches whorled, spreading-upswept; twigs slender, pale red-brown, glabrous or pale puberulent, aging gray, ± smooth. Buds ovoid-cylindric, light red-brown, 0.4-0.5 cm, slightly resinous. Leaves 5 per fascicle, spreading to ascending, persisting 2-3 years, 6-10 cm x 0.7-1 mm, straight, slightly twisted, pliant, deep green to blue-green, pale stomatal lines evident only on adaxial surfaces, margins finely serrulate, apex abruptly acute to short-acuminate; sheath 1-1.5 cm, shed early. Pollen cones ellipsoid, 10-15 mm, yellow. Seed cones maturing in 2 years, shedding seeds and falling soon thereafter, clustered, pendent, symmetric, cylindric to lance-cylindric or ellipsoid-cylindric before opening, ellipsoid-cylindric to cylindric or lance-cylindric when open, (7-) 8-20 cm, gray-brown to pale brown, with purple or gray tints, stalks 2-3 cm; apophyses slightly raised, resinous at tip; umbo terminal, low. Seeds compressed, broadly obliquely obovoid; body 5-6 mm, red-brown mottled with black; wing 1.8-2.5 cm, pale brown"  (Flora of North America online).

Habitat/ecology:  In North America (native), "mesic to dry sites; 0-1500 m"  (Flora of North America online).  In New Zealand, "naturalised in scrub and modified forest, an occasional escape from cultivation.  Strobus pine is mostly cultivated in state forests, especially in the Rotorua area"  (Webb et al., 1988; p. 58).

Propagation:  Seed

Native range:  Central and eastern United States and Canada; 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
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	introduced cultivated	Conn, Barry J./Damas, Kipiro Q. (2013) Planted in Morobe Province but not successful as a Plantation species.

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) Beijing Shi, Jiangsu (Nanjing Shi), Jiangxi (Lu Shan), Liaoning
New Zealand New Zealand	New Zealand (country)	introduced invasive cultivated	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 58)

Also reported from
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Canada Canada	Canada	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (continental except west coast) United States (other states)	United States (other states)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)

Control:  If you know of control methods for Pinus strobus, please let us know.