Pinus kesiya

Pinus kesiya
File:Pinus kesiya Blanco2.453.jpg
Conservation status
Least Concern (IUCN 2.3)
Scientific classification
Kingdom:	Plantae
Division:	Pinophyta
Class:	Pinopsida
Order:	Pinales
Family:	Pinaceae
Genus:	Pinus
Subgenus:	Pinus
Species:	P. kesiya
Binomial name
Pinus kesiya Royle ex Gordon

Pinus kesiya (Khasi pine, Benguet pine or three-needled pine) is one of the most widely distributed pines in Asia. Its range extends south and east from the Khasi Hills in the northeast Indian state of Meghalaya, to northern Thailand, Philippines, Burma, Cambodia, Laos, southernmost China, and Vietnam. It is an important plantation species elsewhere in the world, including in southern Africa and South America.

The common name "Khasi pine" is from the Khasi hills in India, and "Benguet pine" is from the landlocked province of Benguet in Luzon, Philippines, where it is the dominant species of the Luzon tropical pine forests. The Benguet pine is sometimes treated as a separate species, Pinus insularis; however, the current opinion is to treat these as conspecific with P. kesiya. The city of Baguio is nicknamed "The City of Pines", as it is noted for large stands of this tree.

A Khasi pine in Benguet, Philippines.

Description

File:Bark of Benguet Pine.JPG

Bark of Benguet pine

Pinus kesiya is a tree reaching up to 30–35 m tall with a straight, cylindrical trunk. The bark is thick and dark brown, with deep longitudinal fissures. The branches are robust, red brown from the second year, the branchlets horizontal to drooping. The leaves are needle-like, dark green, usually 3 per fascicle, 15–20 cm long, the fascicle sheath 1–2 cm long and persistent. The cones are ovoid, 5–9 cm long, often curved downwards, sometimes slightly distorted; the scales of second-year cones are dense, the umbo a little convex, sometimes acutely spinous. The scales have transverse and longitudinal ridges across the middle of the scale surface. The seeds are winged, 6–7 mm long with a 1.5-2.5 cm wing. Pollination is in mid spring, with the cones maturing 18–20 months after.

Khasi pine usually grows in pure stands or mixed with broad-leaved trees, but does not form open pine forests.

Commercial use

The soft and light timber of Pinus kesiya can be used for a wide range of applications, including boxes, paper pulp, and temporary electric poles. It is intensely used for timber, both sourced in natural forests and plantations.

The good-quality resin is not abundant and has not been much used except during the Spanish colonial period in the Philippines for the production of turpentine.

Local names

Locally, the khasi pine is called:

• Burmese: ထင်းရှူး [tʰḭ́ jú]
• Chinese: 思茅松 (Sīmáo sōng), after town Simao
• Ilokano: sáleng
• Khasi : kseh
• Laotian: ຄົວ [kʰúə]
• Thai: สนสามใบ (rtgs: son sam bai, pronounced [sǒn sǎːm bāj]), after their leaves
• Vietnamese: thông ba lá

External links

• Gymnosperm Database: Pinus kesiya
• Suitability of Pinus kesiya for tree-ring analyses