<Li> density is 720 kg / m . </Li> <P> Tectona grandis was first formally described by Carl Linnaeus the Younger in his 1782 work Supplementum Plantarum . 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 . </P> <P> 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 . Tectona grandis is native to India, Indonesia, Myanmar, northern Thailand, and northwestern Laos . </P> <P> 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 . </P>

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