Small to large tree up to 48 m, 70 cm ø, often with fluted trunk. Bark rough, pustulate, with large warty lenticels. Branchlets initially densely set with greyish to brownish curly simple hairs, later glabrous and sparsely warty lenticellate. Leaves thin- to thick-coriaceous, lanceolate to ovate-lanceolate, (2-)4-6(-9) by (l-)2-3 (-3 ½) cm (index 2- 2 ½), broadest at or slightly below the middle, more or less glabrous, glossy; Stipules linear-lanceolate acute, c. 4-5 by 1-1½ mm, soon caducous. Flowers in fascicles of 3-10. — Functionally ♂ flowers globose before anthesis, 1½-2mm ø, subglabrous; Fruit obovate-elliptic, glabrous, including the wing 2-3 ½ by l ½-2cm, stalk 5-10 mm, articulate, lower part hairy.
Asia-Temperate, Asia-Tropical: Assam (Assam present, Manipur present); Bangladesh (Bangladesh present); East Himalaya (Bhutan present, Sikkim present); India present; Laos (Laos present); Sulawesi (Sulawesi present); Vietnam (Vietnam present), Bonthain present, Burma present, Chittagong Hills present, E. Himalaya present, Flores present, Gajo- & Karo-Batak Lands present, Hukong Valley present, Khasia Hills present, Lesser Sunda Is present, Mt Bavi present, N. Sumatra present, Poso present, northern parts present
China (?), India (E. Himalaya, Sikkim, Bhutan, Khasia Hills, Manipur, Assam), Bangladesh, Burma (Hukong Valley, Chittagong Hills), Thailand (northern parts), Laos, Vietnam (Mt Bavi); in Malesia: N. Sumatra (Gajo- & Karo-Batak Lands), Lesser Sunda Is. (Flores), and Celebes (Poso; Bonthain). .
U. lanceaefolia is very closely allied to U. parvifolia JACQ. from China and Japan. It differs from the latter by its narrow leaves with a shorter petiole, serrulate to serrulate-crenulate margin, and fewer lateral nerves, obovoid-globose buds, the campanulate perianth of the functionally 9 flower, and the reticulate venation of the fruit; see .
Very little is known about the usage of this species, but judging from the enormous size it can attain it must have been a useful timber in house-building, construction, etc., at least to the local inhabitants.
ENGL - in E. & P., Nat. Pfl. Fam., ed. 3, 1. 1888: 62
TOUW & STEEN. - in Blumea. 1968: 84
ROXB. - in Fl. Ind., ed. Carey. 1832: 66
WALL. - in DC., Prod. 17. 1873: 162
HOOK.F. - in Fl. Br. Ind. 1888: 480
SCHNEIDER - in Oest. Bot. Z. 1916: 32
GAMBLE, Man. Ind. Timb., ed. 1. 1881: 342
KURZ - in For. Fl. Burma. 1877: 473
MELVILLE & HEYBROEK - in Kew Bull. 1971: 24
PRAIN, Beng. Pl. 1903: 718
HEMSL. - in J. Linn. Soc. Bot. 1894: 447
BRANDIS, Ind. Trees. 1906: 594
MERR. - in Contr. Arn. Arb. 1934: 44
WALL. - in Sargent, Pl. Wils. 3. 1917: 263
PLANCH. - in Ann. Sc. Nat. 1848: 281