Pinus merkusii

Pinus merkusii, the Merkus pine[2] or Sumatran pine, is a pine native to the Malesia region of southeast Asia, and the only one that occurs naturally south of the equator.[3]

Pinus merkusii
Pinus merkusii Toba.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnosperms
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Genus: Pinus
Subgenus: P. subg. Pinus
Section: P. sect. Pinus
Subsection: P. subsect. Pinus
Species:
P. merkusii
Binomial name
Pinus merkusii
Jungh. & de Vriese
CL-39 Pinus merkusii range map.png
Natural range of Pinus merkusii

DescriptionEdit

Pinus merkusii is a medium-sized to large tree, reaching 25–45 metres (82–148 feet) tall and with a trunk diameter of up to 1 m (3 ft 3 in). The bark is orange-red, thick and deeply fissured at the base of the trunk, and thin and flaky in the upper crown. The leaves ('needles') are in pairs, very slender, 15–20 centimetres (6–8 inches) long and less than 1 millimetre (132 in) thick, green to yellowish green.

The cones are narrow conic, 5–8 cm (2–3+14 in) long and 2 cm (34 in) broad at the base when closed, green at first, ripening glossy red-brown. They open to 4–5 cm broad at maturity to release the seeds. The seeds are 5–6 mm (31614 in) long, with a 15–20 mm (1234 in) wing, and are wind-dispersed.

Related speciesEdit

Pinus merkusii is closely related to the Tenasserim pine (P. latteri), which occurs farther north in southeast Asia from Myanmar to Vietnam; some botanists treat the two as conspecific (under the name P. merkusii, which was described first), but P. latteri differs in longer (18–27 cm or 7–10+12 in) and stouter (over 1 mm thick) leaves and larger cones with thicker scales, the cones often remaining closed for some time after maturity. It is also related to the group of Mediterranean pines including Aleppo pine and Turkish pine, which share many features with it.

DistributionEdit

It can be found mainly in Indonesia in the mountains of northern Sumatra, and with two outlying populations in central Sumatra on Mount Kerinci and Mount Talang, and in the Philippines on Mindoro and in the Zambales Mountains on western Luzon.

The population in central Sumatra, between 1° 40' and 2° 06' S latitude, is the only natural occurrence of any member of the Pinaceae south of the Equator. It generally occurs at moderate altitudes, mostly 400–1,500 m (1,300–4,900 ft), but occasionally as low as 90 m (300 ft) and up to 2,000 m (6,600 ft).[4]

ReferencesEdit

  1. ^ Farjon, A. (2013). "Pinus merkusii". IUCN Red List of Threatened Species. 2013: e.T32624A2822050. doi:10.2305/IUCN.UK.2013-1.RLTS.T32624A2822050.en. Retrieved 13 November 2021.
  2. ^ USDA, NRCS (n.d.). "Pinus merkusii". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 4 October 2015.
  3. ^ https://www.conifers.org/pi/Pinus_merkusii.php
  4. ^ Critchfield, William (1966). Geographic Distribution of the Pines of the World. U.S. Department of Agriculture, Forest Service. p. 15.