Overview

Comprehensive Description

Miscellaneous Details

"Notes: Dry Deciduous Forests, Cultivated in Plains"
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Miscellaneous Details

Valued for timber and planted in large numbers all over India.
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Brief

Flowering class: Dicot Habit: Tree
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Distribution

"Karnataka: Belgaum, Coorg, Hassan, Mysore, N. Kanara, Shimoga Kerala: All districts Tamil Nadu: All districts"
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"
Global Distribution

South and South East Asia

Indian distribution

State - Kerala, District/s: All Districts

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Found in deciduous forests from plains to 800m. Often planted in the plains. Common. Tropical Asia and Malesia.
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Localities documented in Tropicos sources

Tectona grandis L. f.:
Belize (Mesoamerica)
Burma (Asia)
Costa Rica (Mesoamerica)
Ecuador (South America)
El Salvador (Mesoamerica)
Honduras (Mesoamerica)
India (Asia)
Mexico (Mesoamerica)
Madagascar (Africa & Madagascar)
Nicaragua (Mesoamerica)
Panama (Mesoamerica)
China (Asia)
Colombia (South America)
Venezuela (South America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Fujian, Guangdong, Guangxi, Taiwan, Yunnan [native to India, Indonesia, Malaysia, and Myanmar]
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National Distribution

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Distribution: Native of tropical southern Asia and Malaysia, widely cultivated for its highly priced timber.
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Physical Description

Morphology

"
Flower

In axillary/or terminal cymose panicles, dichotomously branched; whitish-yellow. Flowering from June-September.

Fruit

A globose drupe, with a stony endocarp and spongy epicarp; seeds oblong. Fruiting throughout the year.

Field tips

Bark light brown or grey. Stem quadrangular. Leaves very large, rough.

Leaf Arrangement

Opposite-decussate

Leaf Type

Simple

Leaf Shape

Elliptic

Leaf Apex

Obtuse-acute

Leaf Base

Rounded-acute

Leaf Margin

Entire

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Description

Deciduous tree, up to 50 m tall, younger parts densely pubescent with stellate hairs. Leaves broadly elliptic, (10-)25-50(-80) cm long, (5-)20-40(-50) cm broad, entire to repand-dentate, acute or shortly acuminate, glabrescent, shining-green above, paler and tomentose beneath. Terminal cymes usually 30-40 cm long, and nearly as broad. Flowers c. 6 mm across, white, rarely pinkish. Calyx 3-4.5 mm long, campanulate, 5-7-toothed, bladder-like and enlarged up to 2.5 cm in fruit, brittle and dry. Corolla-tube 1.5-3 mm long; lobes 5-7, ovate-elliptic, 2.5-3 mm long, straight or reflexed. Stamens 2.5-4 mm long, exserted. Fruit subglobose to tetragonally flattened, c. 1.5 cm in diameter, tomentose, usually slightly 4-lobed at the apex.
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Description

Trees to 40 m tall. Branchlets gray to grayish brown, 4-angled, yellowish to grayish brown stellate tomentose. Petiole robust, 2-4 cm; leaf blade ovate-elliptic to ovate, 15-45(-70) X 8-23(-37) cm, papery, abaxially densely grayish brown to yellowish brown minutely stellate tomentose, adaxially scabrous and puberulent along veins, base cuneate and de-current, margin entire, apex acuminate to obtuse, veins 7-12 pairs. Panicles 25-40 X 30 cm. Flowers fragrant. Calyx tube 2.5-3 mm, with white stellate hairs. Corolla white; tube 2.5-3 mm, outside puberulent glandular; lobes ca. 2 mm, obtuse. Ovary strigose. Style 3-4 mm. Fruit globose, 1.2-1.8 cm in diam., minutely tomentose. Fl. Jun-Aug, fr. Sep-Dec.
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Diagnostic Description

Diagnostic

"Habit: A large deciduous tree, upto 15m."
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Diagnostic

"Deciduous trees, to 30 m high, bark 10-20 mm thick, yellowish-brown, rough, shallowly vertically fissured, fibrous; blaze pale yellowish concentrically lamellate; bole often fluted at base; branchlets 5-10 mm thick, 4-angled, puberulous. Leaves simple, opposite, estipulate; petiole 10-50 mm long, stout, tomentose; lamina 30-60 x 15-30 cm, ovate, obovate, base attenuate, apex acute or obtuse, margin entire, wavy, glabrous above and pubescent below with minute red glands, coriaceous; lateral nerves 8-10 pairs, pinnate, prominent, raised beneath, puberulent beneath; intercostae scalariform, prominent. Flowers bisexual, white, 7 mm across, in terminal cymose panicles, 10-30 cm across, puberulus; calyx 5 mm long, campanulate, lobes 5-6, subequal, ovate, tomentose; corolla 6 mm long, lobes 5-6, oblong, spreading; stamens 5-6, equal, erect, inserted at the throat, exserted; filaments 3 mm; anthers oblong; ovary globose, superior, densely hairy, 4-celled, 1 ovule in each cell; style slender, 4 mm; stigma linearly bifid. Fruit a drupe, 1.5-2 cm across, globose, brown, densely floccose hairy, covered by the inflated calyx, epicarp spongy, endocarp stony; seeds 1-4, oblong."
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Diagnostic

Habit: Tree
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Type Information

Isotype for Tectona grandis L. f.
Catalog Number: US 1599953
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): J. W. Gillespie
Year Collected: 1928
Locality: Mountains south of Levuka., Ovalau, Viti Levu Group, Fiji, Pacific Islands
Elevation (m): 250 to 250
  • Isotype: Moldenke, H. N. 1947. Phytologia. 2: 231.
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Ecology

Habitat

General Habitat

"Moist deciduous forests, also raised in plantations"
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General Habitat

Less successfully raised in plains generally by river banks. Hills above 600m. In most parts of western ghats and parts of eastern ghats.
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Cultivated and sometimes naturalized; below 900 m.
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Life History and Behavior

Cyclicity

Flowering and fruiting: May-January
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Flower/Fruit

Fl. Per.: Aug.-Nov.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Tectona grandis

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Tectona grandis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Specimens with Barcodes: 17
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

Reasons: Native of India-Laos planted for timber or ornament in various tropical areas including the west Indies from Cuba and Jamaica to Trinidad and from Panama to Brazil. Grown in southern Florida. Grown experimentally or for ornament at low elevations in Puerto Rico.

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Relevance to Humans and Ecosystems

Benefits

Uses

"Good source of nectar. Leaves made into  plates.

Wood very hard, very valuable and great demand as for timber.

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Folklore

Leaves used for thatching and serving plate. Wood used for house construction and making agricultural implements.

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Uses

Medicinal
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Wikipedia

Teak

Teak is a tropical hardwood tree species Tectona grandis. The species is placed in the family Lamiaceae. Tectona grandis is a large, deciduous tree that is dominant in mixed hardwood forests. It has small, fragrant white flowers and papery leaves that are often hairy on the lower surface. It is sometimes known as the "Burmese Teak". Teak wood has a leather-like smell when it is freshly milled. Teak timber is particularly valued for its durability and water resistance, and is used for boat building, exterior construction, veneer, furniture, carving, turnings, and other small wood projects.[1] Tectona grandis is native to south and southeast Asia, mainly India, Indonesia, Malaysia, Thailand and Burma, but is naturalized and cultivated in many countries in Africa and the Caribbean. Burma accounts for nearly one third of the world's total teak production.[citation needed]

The word teak comes from Tamil "tekku" (தேக்கு), Malayalam word thekku (തേക്കു്), and Telugu "teku". From there it went to Portuguese teca. [2]

Description[edit]

Teak is a large, deciduous tree up to 40 m (131 ft) tall with gray to grayish brown branches. Leaves are ovate-elliptic to ovate, 15–45 cm (5.9–17.7 in) long by 8–23 cm (3.1–9.1 in) wide, and are held on robust petioles that are 2–4 cm (0.8–1.6 in) long. Leaf margins are entire.[3]

Flower, fruit & leaves of Tectona grandis in Kolkata, West Bengal, India.
U Bein Bridge Amarapura, Myanmar. The longest teak bridge in the world at 1.2 km (0.75 mi) in length.

Fragrant white flowers are borne on 25–40 cm (10–16 in) long by 30 cm (12 in) wide panicles from June to August. The corolla tube is 2.5–3 mm long with 2 mm wide obtuse lobes. Tectona grandis sets fruit from September to December; fruits are globose and 1.2-1.8 cm in diameter.[3] Flowers are weakly protandrous in that the anthers precede the stigma in maturity and pollen is shed within a few hours of the flower opening.[4] The flowers are primarily entomophilous (insect-pollinated), but can occasionally be anemophilous (wind-pollinated).[5] A 1996 study found that in its native range in Thailand, the major pollinator were species in the Ceratina genus of bees.[4]

Distribution and habitat[edit]

Tectona grandis is one of three species in the genus Tectona. The other two species, T. hamiltoniana and T. philippinensis, are endemics with relatively small native distributions in Myanmar and the Philippines, respectively.[6] Tectona grandis is native to India, Indonesia, Myanmar, northern Thailand, and northwestern Laos.[3][4]

Tectona grandis is found in a variety of habitats and climatic conditions from arid areas with only 500 mm of rain per year to very moist forests with up to 5,000 mm of rain per year. Typically, though, the annual rainfall in areas where teak grows averages 1,250-1,650 mm with a 3-5 month dry season.[7]

Botanical history[edit]

Tectona grandis was first formally described by Carl Linnaeus the Younger in his 1782 work Supplementum Plantarum.[8] In 1975, Harold Norman Moldenke published new descriptions of four forms of this species in the journal Phytologia. Moldenke described each form as varying slightly from the type specimen: T. grandis f. canescens is distinguished from the type material by being densely canescent, or covered in hairs, on the underside of the leaf, T. grandis f. pilosula is distinct from the type material in the varying morphology of the leaf veins, T. grandis f. punctata is only hairy on the larger veins on the underside of the leaf, and T. grandis f. tomentella is noted for its dense yellowish tomentose hairs on the lower surface of the leaf.[9]

Cultivation[edit]

Teak's natural oils make it useful in exposed locations, and make the timber termite and pest resistant. Teak is durable even when not treated with oil or varnish. Timber cut from old teak trees was once believed to be more durable and harder than plantation grown teak. Studies have shown that plantation teak performs on par with old-growth teak in erosion rate, dimensional stability, warping, and surface checking, but is more susceptible to color change from UV exposure.[10]

The vast majority of commercially harvested teak is grown on teak plantations found in Indonesia and controlled by Perum Perhutani (a state owned forest enterprise) that manages the country's forests. The primary use of teak harvested in Indonesia is in the production of outdoor teak furniture for export.Nilambur in Kerala, India is also a major producer of Teak of fine quality, holds the world's oldest Teak plantation.

Teak consumption raises a number of environmental concerns, such as the disappearance of rare old-growth teak. However, its popularity has led to growth in sustainable plantation teak production throughout the seasonally dry tropics in forestry plantations. The Forest Stewardship Council offers certification of sustainably grown and harvested teak products. Propagation of teak via tissue culture for plantation purposes is commercially viable.[11]

Teak plantations were widely established in Equatorial Africa during the Colonial era. These timber resources, as well as the oil reserves, are at the heart of the current (2014) South Sudanese conflict.[12][13]

Much of the world's teak is exported by Indonesia and Myanmar. There is also a rapidly growing plantation grown market in Central America (Costa Rica) and South America.

Hyblaea puera, a moth native to southeast Asia, is a teak pest whose caterpillar feeds on teak and other species of trees common in the region.[14]

Uses[edit]

Teak table

Teak is a yellowish brown timber with good grain and texture. Teak, though easily worked, can cause severe blunting on edged tools because of the presence of silica in the wood. Teak is often an effective material for the construction of both indoor and outdoor furniture. Teak's high oil content, high tensile strength and tight grain makes it particularly suitable for outdoor furniture applications. Over time teak can mature to a silvery-grey finish, especially when exposed to sunlight.[15] It is used in the manufacture of outdoor furniture, boat decks, and other articles where weather resistance is desired. It is also used for cutting boards, indoor flooring, countertops and as a veneer for indoor furnishings. Teak is used extensively in India to make doors and window frames, furniture, and columns and beams in old type houses. It is very resistant to termite attacks. Mature teak fetches a very good price. It is grown extensively by forest departments of different states in forest areas.

Leaves of the teak wood tree are used in making Pellakai gatti (jackfruit dumpling), where batter is poured into a teak leaf and is steamed.[16] This type of usage is found in the coastal district of Udupi in the Tulunadu region in South India. The leaves are also used in gudeg, a dish of young jackfruit made in Central Java, Indonesia, and give the dish its dark brown color.

Teak is used as a food plant by the larvae of moths of the genus Endoclita including E. aroura, E. chalybeatus, E. damor, E. gmelina, E. malabaricus, E. sericeus and E. signifer and other Lepidoptera including Turnip Moth.

Uses in boatbuilding[edit]

Teak tree in Panchkhal valley in Nepal

Teak has been used as a boatbuilding material for over 150 years. In addition to relatively high strength, teak is also highly resistant to rot, fungi and mildew. In addition, teak has a relatively low shrinkage ratio, which makes it excellent for applications where it undergoes periodic changes in moisture. Teak has the unusual properties of being both an excellent structural timber for framing, planking, etc., while at the same time being easily worked, unlike some other similar woods such as purpleheart, and finished to a high degree. For this reason, it is also prized for the trim work on boat interiors. Due to the oily nature of the wood, care must be taken to properly prepare the wood before gluing.

When used on boats, teak is also very flexible in the finishes that may be applied. One option is to use no finish at all, in which case the wood will naturally weather to a pleasing silver-grey. The wood may also be oiled with a finishing agent such as linseed or tung oil. This results in a pleasant, somewhat bland finish. Finally, teak may also be varnished for a deep, lustrous glow.

Teak is also used extensively in boat decks, as it is extremely durable and requires very little maintenance. The teak tends to wear in to the softer 'summer' growth bands first, forming a natural 'non-slip' surface. Any sanding is therefore only damaging. Use of modern cleaning compounds, oils or preservatives will shorten the life of the teak, as it contains natural teak-oil a very small distance below the white surface. Wooden boat experts will only wash the teak with salt water, and re-caulk when needed. This cleans the deck, and prevents it from drying out and the wood shrinking. The salt helps it absorb and retain moisture, and prevents any mildew and algal growth. People with poor knowledge often over-maintain the teak, and drastically shorten its life.

Alternatives to teak[edit]

Due to the increasing cost of teak, various alternatives have been employed. These include purpleheart, iroko, and angelique.

Propagation[edit]

Tree in new leaves in Kolkata, West Bengal, India.

Teak is propagated mainly from seeds. Germination of the seeds involves pretreatment to remove dormancy arising from the thick pericarp. Pretreatment involves alternate wetting and drying of the seed. The seeds are soaked in water for 12 hours and then spread to dry in the sun for 12 hours. This is repeated for 10–14 days and then the seeds are sown in shallow germination beds of coarse peat covered by sand. The seeds then germinate after 15 to 30 days.[17][18]

Clonal propagation of teak has been successfully done through grafting, rooted stem cuttings and micro propagation. While bud grafting on to seedling root stock has been the method used for establishing clonal seed orchards that enables assemblage of clones of the superior trees to encourage crossing, rooted stem cuttings and micro propagated plants are being increasingly used around the world for raising clonal plantations.[citation needed]

The oldest and biggest teak in the world[edit]

The oldest and biggest teak in the world is in Uttaradit Province, Thailand. It is more than 1,500 years old. The tree is 47 metres tall, and the circumference of the trunk is 10.23 metres.[citation needed]

References[edit]

  1. ^ "GRIN Taxonomy for Plants - Tectona". United States Department of Agriculture. October 5, 2007. Retrieved September 22, 2013. 
  2. ^ http://www.etymonline.com/index.php?term=teak
  3. ^ a b c Tectona grandis. Flora of China 17: 16. Accessed online: 17 December 2010.
  4. ^ a b c Tangmitcharoen, S. and J. N. Owens. 1996. Floral biology, pollination, pistil receptivity, and pollen tube growth of teak (Tectona grandis Linn f.). Annals of Botany, 79(3): 227-241. doi:10.1006/anbo.1996.0317
  5. ^ Bryndum, K. and T. Hedegart. 1969. Pollination of teak (Tectona grandis Linn.f.). Silv. Genet. 18: 77-80.
  6. ^ Tewari, D. N. 1992. A monograph on teak (Tectona grandis Linn.f.). International Book Distributors.
  7. ^ Kaosa-ard, A. 1981. Teak its natural distribution and related factors. Nat. His. Bull. Siam. Soc., 29: 55-74.
  8. ^ International Organization for Plant Information (IOPI). "Plant Name Search Results" (HTML). International Plant Names Index. Retrieved 17 December 2010. 
  9. ^ Moldenke, H. N. 1975. Notes on new and noteworthy plants. LXXVII. Phytologia, 31: 28.
  10. ^ Williams, R. Sam; Miller, Regis (2001). "Characteristics of Ten Tropical Hardwoods from Certified Forests in Bolivia". Wood and Fiber Science 33 (4). pp. 618–626. 
  11. ^ Teak tissue culture company[dead link]
  12. ^ http://africanarguments.org/2013/03/14/is-all-well-in-the-teak-forests-of-south-sudan-by-aly-verjee/
  13. ^ http://elmawood.com/
  14. ^ Herbison-Evans, Don (2007-09-06). "Hyblaea puera". University of Technology, Sydney. Archived from the original on 2008-07-24. Retrieved 2008-03-12. 
  15. ^ http://www.williamsskiandpatio.com/page.cfm/patiocareguide.html
  16. ^ http://www.teakhardwoods.com/teak
  17. ^ Kadambi, K. (1972). Silviculture and management of Teak. Bulletin 24 School of Forestry, Stephen F. Austin State University Nacogdoches, Texas
  18. ^ B. Robertson (2002) Growing Teak in the Top End of the NT. Agnote. No. G26 PDF
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Notes

Comments

Introduced and cultivated in some parts of Punjab and Sind. It is very sensitive to frost when young.
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Comments

Medicinal, timber.
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