Derived from S.I. Ali, Flora of Pakistan 203:140-15 and S.Z. Liu, Flora of China 4:
Plants trees, to 10 m tall; branches dull brown, glabrous, young branches silky to glabrous, with longitudinal furrows; buds narrowly ovoid, glabrous, acute. Leaves:stipules caducous, obliquely ovate to semi-cordate, glandular serrate; petioles 1-1.8 cm, glabrous; blades 5-16(-18) cm long, 1.5-5 cm wide, lanceolate to ovate-lanceolate, abaxial surface pale, somewhat silky and glaucous when young, upper surface green, glabrous, and shiny, base cuneate to rounded, margins serrate, tip acuminate; leaves, leaves towards the base of a shoot usually smaller than others. Staminate catkins 5-13 cm long, about 6 mm wide: peduncles up to 8 mm long, rachis hairy' bracts 1-2 mm long, obovate to elliptic, concave, yellowish brown, totally or partly villous, tip truncate to obtuse or acute; flowers appearing after the leaves; glands usually connected, much lobed, discoid stamens 5-10, filaments free, hairy at the base; anthers yellow, ovoid. Pistillate catkins 2.5 - 3 cm long; rachis hairy; bracts like those of the staminate catkins but slightly smaller, about as long as the stipe; flowers: gland 1, slightly clasping the stipe; ovary ovoid, about as along as or slightly shorter thn the stipe; style almost absent, 2-cleft, each branch 2-lobed. Fruiting catkins lax; stipes 0.5 3mm long; capsules 3.5-5 mm long, ovoid, glabrous.
Salix tetrasperma is native to Pakistan, India, Myanmar, China, Thailand, Indonesia, Malaysia, Vietnam, and the Philippines.
The above description is based on those by S.I. Ali in the Flora of Pakistan (203:14-15) and Si Zi Liu in the Flora of China. There are some differences between the two descriptions but only one that seems significant: Ali gives the length of the pistillate catkins as 2.5-3 cm, Liu states that they are nearly as long as the staminate catkins, which he said were about 10 cm long. This difference, and the other, much smaller, discrepancies may reflect regional variation or the use of the same name for two or more taxa. Resolving the issue would require examination of Salix tetrasperma across its whole range.