Bi means two and pinnate means feathered
A very large deciduous tree with enormous umbrella-shaped crown. Trunk is usually short and fat. Pinkish puff-like flowers and twice feathered leaves that close themselves at night and cloudy weather. Though from tropical America, it had become very common in India, especially as an avenue tree
A familiar tree with twice-feathered leaf that blooms in summer months in crinkled yellow flowers followed by small copper colored flat pods. Like Rain Tree, this tree is widely used as avenue tree
A familiar light crowed umbrella shaped exotic ornamental tree with twice feathered leaves that in April becomes a magnificent sight with profuse scarlet flowers. Trunk becomes buttressed with age.
Adenanthera pavonina
A medium to large tree with gulmohur–like leaves (bipinnate) with 4-6 pair of oppositely arranged pinnae but the leaflets are alternatively arranged (diagnostic).
Albizzia lebbeck
Medium to large deciduous tree with a short bole and thin spreading crown with twice feathered leaves. In Feb and early Mar, the tree is full of straw-colored pods in bare branches
Parkia biglandulosa
A large spreading tree from Malaysia with a huge bole and leaves very similar to familiar gulmohur tree
Millingtonia hortensis
A tall tree with corky bark, nearly vertical limbs, and drooping twigs. The long, tubular, white, scented flowers appear in November and December.
Albizia procera
A tall light-crowned tree, usually without branched up to quite a height, with pale yellow bark. Not common in Kolkata