The Jamun (Syzygium cumini), also known as Jambul or Java plum, is an evergreen tree native to India. It's a tall tree, reaching up to 30 meters in height, and can live for over a century. The tree has a light greyish, smooth bark on the upper parts, which becomes dark grey and rough at the base. Its leaves are glossy, oblong-elliptic, and have a turpentine-like aroma. The tree produces small, fragrant white flowers followed by oblong, ovoid fruits that are green when young, turning pinkish and finally a shining black-purple when ripe. The fruit has a sweet, slightly acidic, and spicy flavor. 

Here's a more detailed description:

Appearance: The Jamun tree is a tall, evergreen tree with a dense crown. The bark is smooth and light grey on the upper part of the trunk, becoming darker and rougher at the base. 

Leaves: The leaves are shiny, elliptic-oblong, and have a distinctive aroma. 

Flowers: The tree produces small, fragrant, white flowers. 

Fruit: The fruit is an oblong, ovoid berry, green when young, turning pinkish and then a deep purple-black when ripe. It has a unique sweet, slightly acidic, and spicy flavor. 

Wood: The wood is strong and water-resistant, making it suitable for various applications like railway sleepers and well installations. 

Growth: It's a slow-growing tree that can adapt to various soil conditions, including poor and degraded lands. 

Climate: The tree thrives in tropical and subtropical climates and is relatively drought tolerant. 

Cultivation: While the fruits are popular and sell at a high price, Jamun is not typically grown as an orchard tree but rather as an avenue tree or windbreak. 

Varieties: There are different varieties of Jamun, including a white-fruited variety.