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FOC | Family List | FOC Vol. 4 | Pinaceae | Pinus

4. Pinus yunnanensis Franchet, J. Bot. (Morot). 13: 253. 1899.

云南松 yun nan song

Trees or rarely shrubs; bark brown-gray, longitudinally fissured, scaly; branchlets reddish brown, thick, glabrous; winter buds red-brown, ovoid, large, not resinous. Needles (2 or)3 per bundle, flabellate-triangular or semiorbicular in cross section, 7-30 cm × 1-1.2 mm, stomatal lines present on all surfaces, resin canals 4 or 5, median and marginal, base with persistent sheath. Seed cones shortly pedunculate, green, maturing to brown or chestnut brown, conical-ovoid, 5-11 cm, dehiscent or indehiscent at maturity. Seed scales oblong-ellipsoid, ca. 3 × 1.5 cm; apophyses usually swollen, cross keeled, rarely recurved; umbo slightly sunken or slightly protruded, ending in a minute prickle. Seeds brown, slightly appressed, nearly ovoid or obovoid, 4-5 mm; wing 1.2-1.4 cm. Pollination Apr-May, seed maturity Oct.

* Mountains, river basins, dry and sunny slopes; 400-3100 m. Guangxi, Guizhou, SW Sichuan, SE Xizang, Yunnan

The timber is used for construction, railway sleepers, boards, furniture, and wood pulp. The trunk can be used as a source of resin, the roots for cultivating fungi, and the bark for producing tannin.

1 Shrubs; seed cones indehiscent at maturity; needles 7-13 cm   4c var. pygmaea
+ Trees; seed cones dehiscent at maturity; needles to 30 cm.   (2)
2 (1) Needles not or slightly pendulous, ca. 1.2 mm in diam.   4a var. yunnanensis
+ Needles pendulous, less than 1 mm in diam.   4b var. tenuifolia

Lower Taxa


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