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''Salix tetrasperma'', commonly called Indian willow, is a medium-sized tree of wet and swampy places, shedding its leaves at the end of 
monsoon
A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with annual latitudinal oscil ...
season. It flowers after leafing. The bark is rough, with deep, vertical fissures and the young shoots leaves are silky. The leaves are lance-like, or ovate-lancelike, 8–15 cm long, with minutely and regularly toothed margins. The male sweet scented catkin
A catkin or ament is a slim, cylindrical flower cluster (a spike), with inconspicuous or no petals, usually wind-pollinated (anemophilous) but sometimes insect-pollinated (as in ''Salix''). They contain many, usually unisexual flowers, arranged cl ...
s are 5–10 cm long, and are borne on leafy branchlets. The female catkins are 8–12 cm long. The capsules are long, stipulate, in groups of 3 to 4.
It grows in many parts of south and southeastern Asia, including India, Pakistan, Bangladesh, Nepal, Laos, and Thailand,.Gardner, Simon, Pindar Sidisunthorn, and Vilaiwan Anusarnsunthorn. A Field Guide to Forest Trees of Northern Thailand. Bangkok: Kobfai Publishing Project, 2000.
In Manipur
Manipur () ( mni, Kangleipak) is a state in Northeast India, with the city of Imphal as its capital. It is bounded by the Indian states of Nagaland to the north, Mizoram to the south and Assam to the west. It also borders two regions of Myanm ...
, in NE India
India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
, the new flowers of Indian willow, locally known as ঊযুম (''ooyum'') are eaten, and are considered delicious. In Maharashtra, this tree is called ''walunj''. It can be found in Pune, Satara, Sangli, and Kolhapur. In Nepal, it is called Bainsa(बैँस).
References
tetrasperma Flora of tropical Asia {{Salicaceae-stub Trees of Nepal Trees of India