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In physical geography, tundra (/ ˈ t ʌ n d r ə, ˈ t ʊ n-/) is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: Arctic tundra, [2] alpine tundra, [2] and Antarctic tundra.
Pyrus pashia is a fruit bearing tree. Its fruit is edible and characterized as being pome. [3] It looks like the russet apple and has an astringent but sweet taste when ripe. [citation needed] The early fruit is mostly of light green color but at maturity, its color turns blackish brown with numerous yellow and white dots on its skin surface. [5]
The tree is called the "tree of sorrow" because the foliage becomes droopy as blooming flowers fall off during early morning. [8] The Latin specific epithet arbor-tristis means "sad tree". [ 8 ] In India and Nepal, Nyctanthes arbor-tristis is known as pārijāta (पारिजात).
Butea monosperma is a small-sized dry-season deciduous tree, growing to 15 m (49 ft) tall. It is slow-growing: young trees have a growth rate of a few feet per year. The leaves are pinnate, with an 8–16 cm (3.1–6.3 in) petiole and three leaflets. Each leaflet is 10–20 cm (3.9–7.9 in) long.
The tree has thin, straight, light, grey spines in axillary pairs, usually in 3 to 12 pairs, 5 to 7.5 cm (3 in) long in young trees, mature trees commonly without thorns. The leaves are bipinnate, with 3–6 pairs of pinnulae and 10–30 pairs of leaflets each, tomentose, rachis with a gland at the bottom of the last pair of pinnulae.
It is cultivated as a shade tree in North and South America. [9] In India and Pakistan, the tree is used to produce timber. Wood from Albizia lebbeck has a density of 0.55-0.66 g/cm 3 or higher. [10] Bark on a tree in Hong Kong. Even where it is not native, some indigenous herbivores are liable to utilize lebbeck as a food resource.
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The death of a full-grown tree initiates a treefall gap, where light is exposed to the soil and creates resources for seeds and younger trees. Treefall gaps have been proven to maintain tree diversity by increasing stem density, which in turn can lead to species richness. [ 2 ]