Comments
provided by eFloras
Morphologically intermediate between
Pinus yunnanensis of lower elevations and
P. tabuliformis of more northerly latitudes. Molecular evidence supports the hypothesis that
P. densata originated as a Tertiary natural hybrid involving the former two species and a third, unknown species.
Can be used for afforestation in the alpine zones of W Sichuan and E Xizang.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
provided by eFloras
Trees to 30 m tall; trunk to 1.3 m d.b.h.; bark reddish brown, scaly and plated when young, finally dark grayish brown, forming irregular, square, thick plates; crown ovoid-conical, broadly ovoid in old trees; branches spreading; 1st-year branchlets shiny yellowish brown, stout; 2nd- and 3rd-year branchlets reddish brown; winter buds dull brown, ovoid-conical, ca. 15 × 6 mm, slightly resinous, scales white fringed at margin, acuminate at apex. Needles persisting for 3 years, usually 2(or 3) per bundle, straight, slightly twisted, 8-14 cm × 1-1.5 mm, stomatal lines present on all surfaces, resin canals 3 or 4, marginal, occasionally 1 or 2 median, base with persistent sheath initially 5-10 mm, margin finely serrulate, apex acute. Pollen cones yellowish brown, cylindric, 10-18 × 3-4.5 mm. Seed cones solitary or in pairs, pendulous, sessile or very shortly pedunculate, shiny chocolate brown at maturity, narrowly ovoid before opening, ovoid or broadly ovoid when open, 4-6 × 4-7 cm, persistent. Seed scales with apophyses prominent, rhombic, 4-7 mm thick, sharply transversely keeled; umbo dorsal, with a short prickle. Seeds light grayish brown, ellipsoid-ovoid, 4-6 mm; wing 1.5-2 cm. Pollination May, seed maturity Oct of 2nd year.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
provided by eFloras
S Qinghai, W Sichuan, SE Xizang, Yunnan
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
provided by eFloras
* Open forests in high mountains, forming pure stands or (below 3000 m) mixed with Pinus armandii and P. yunnanensis; 2600-3500 (-4200) m.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Synonym
provided by eFloras
Pinus prominens Masters; P. sinensis D. Don var. densata (Masters) Shaw; P. tabuliformis Carriere var. densata (Masters) Rehder; P. wilsonii Shaw (1911), not Roezl (1857).
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Cyclicity
provided by Plants of Tibet
Pollination in May; seed maturity October of 2nd year.
Distribution
provided by Plants of Tibet
Pinus densata is occurring in S Qinghai, W Sichuan, SE Xizang, Yunnan of China.
Evolution
provided by Plants of Tibet
Morphologically intermediate between Pinus yunnanensis of lower elevations and Pinus tabuliformis of more northerly latitudes. Molecular evidence supports the hypothesis that Pinus densata originated as a Tertiary natural hybrid involving the former two species and a third, unknown species (Song et al., 2002).
General Description
provided by Plants of Tibet
Trees to 30 m tall; trunk to 1.3 m d.b.h.; bark reddish brown, scaly and plated when young, finally dark grayish brown, forming irregular, square, thick plates; crown ovoid-conical, broadly ovoid in old trees; branches spreading; 1st-year branchlets shiny yellowish brown, stout; 2nd- and 3rd-year branchlets reddish brown; winter buds dull brown, ovoid-conical, ca. 15 × 6 mm, slightly resinous, scales white fringed at margin, acuminate at apex. Needles persisting for 3 years, usually 2 (or 3) per bundle, straight, slightly twisted, 8-14 cm long, 1-1.5 mm wide, stomatal lines present on all surfaces, resin canals 3 or 4, marginal, occasionally 1 or 2 median, base with persistent sheath initially 5-10 mm, margin finely serrulate, apex acute. Pollen cones yellowish brown, cylindric, 10-18 mm long, 3-4.5 mm wide. Seed cones solitary or in pairs, pendulous, sessile or very shortly pedunculate, shiny chocolate brown at maturity, narrowly ovoid before opening, ovoid or broadly ovoid when open, 4-6 cm long, 4-7 cm wide, persistent. Seed scales with apophyses prominent, rhombic, 4-7 mm thick, sharply transversely keeled; umbo dorsal, with a short prickle. Seeds light grayish brown, ellipsoid-ovoid, 4-6 mm; wing 1.5-2 cm.
Genetics
provided by Plants of Tibet
The basic chromosomal number of Pinus densata is 2n = 24 (Li and Qian, 1993; Shi and Wang, 1994).
Habitat
provided by Plants of Tibet
Growing in open forests in high mountains, forming pure stands or mixed with Pinus armandii and Pinus yunnanensis; 2600-3800 m.
Threats
provided by Plants of Tibet
Pinus densata is reported be lower risk / least concern (Conifer Specialist Group, 1998).
Uses
provided by Plants of Tibet
Pinus densata can be used for afforestation in the alpine zones of W Sichuan and E Xizang.
Pinus densata
provided by wikipedia EN
Pinus densata, commonly known as the Sikang pine, is a species of conifer in the family Pinaceae.
It is endemic to – found only in – China.[2]
References
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- Wikipedia authors and editors
Pinus densata: Brief Summary
provided by wikipedia EN
Pinus densata, commonly known as the Sikang pine, is a species of conifer in the family Pinaceae.
It is endemic to – found only in – China.
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- Wikipedia authors and editors