ساج

ساج Tectona
Tectona grandis بأوراق جديدة في كولكاتا، البنغال الغربية، الهند.
التصنيف العلمي
أصنوفة غير معروفة (أصلحها):	Tectona
الأنواع
Tectona grandis Tectona hamiltoniana Tectona philippinensis

Tectona is a genus of tropical hardwood trees in the mint family, Lamiaceae. The three species are often collectively called teak.

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 الوصف

Tectona is native to south and southeast Asia, mainly India, Pakistan, Bangladesh, Myanmar, Indonesia and Thailand, and are commonly found as a component of monsoon forest vegetation. They are large trees, growing to 30–40 m (90–120 ft.) tall, deciduous in the dry season. Tectona grandis is an economically important species which is the source of most commercial teak wood products.

 Systematics

Teak belongs to the family Lamiaceae (in older classifications in Verbenaceae). Sometimes it is included in the subfamily Prostantheroideae. There are three species of Tectona:

• Tectona grandis (common teak) is by far the most important, with a wide distribution in Bangladesh, Sri Lanka, Myanmar, Thailand, China, India, and Pakistan.
• Tectona hamiltoniana (Dahat teak) is a local endemic species confined to Burma, where it is endangered.
• Tectona philippinensis (Philippine teak) is endemic to the Philippines, and is critically endangered according to the IUCN (http://iucnredlist.org/details/32123/0).

The genus Tectona is a conserved name against the earlier homotypic synonym Theka Adans. The genus was originally described by Carl Linnaeus the Younger in 1782.

 أمثلة بارزة

The biggest and oldest teak is in Uttaradit, Thailand. It is more than 1,500 years old. Its height is 47 metres.