Ulmus lanceifolia Roxb., Pl. Asiat. Rar. 2: 86, pl. 200 1831. (syn: Ulmus hookeriana Planch.; Ulmus tonkinensis Gagnep.);
Nepal to China (Yunnan, Guangxi) and Indo-China, Sumatera, Lesser Sunda Islands (Flores), Sulawesi: Assam, Bangladesh, China South-Central, China Southeast, East Himalaya, Hainan, Laos, Lesser Sunda Is., Myanmar, Nepal, Sulawesi, Sumatera, Thailand, Vietnam as per POWO;

Trees, to 30 m tall, d.b.h. 40-80 cm, evergreen. Bark yellowish gray to chestnut brown, exfoliating in irregular flakes. Branchlets brown to red-brown, pubescent when young, ± pubescent with age, unwinged and without a corky layer, with scattered lenticels. Winter buds dark brown to red-brown, ovoid-orbicular, pubescent or glabrous. Petiole 2-7 mm, pubescent; leaf blade lanceolate, ovate-lanceolate, or narrowly orbicular-lanceolate, 3-10(-11) × 1.5-3.5 cm, thick, abaxially pea green and pubescent only near petiole or occasionally with a few hairs on midvein, adaxially lustrous green and pubescent only on midvein, base rounded or ± oblique and asymmetric, margin obtusely regularly simply serrate, apex acuminate; midvein depressed; secondary veins 6-18 on each side of midvein. Inflorescences fascicled cymes, 3-11-flowered. Flowers from floral buds. Perianth glabrous or margin ciliate. Samaras orange-brown, obovate, orbicular-obovate, or ± orbicular, strongly oblique, 1.2-2.8 × 1.2-2.1 cm, glabrous except for pubescence on stigmatic surface in notch; stalk shorter than perianth, glabrous or pubescent; perianth persistent. Seed at center or toward apex of samara.
Forest margins
(Attributions- Compiled from secondary sources listed in references by Kishor Deka for the Assam Biodiversity Portal project as per India Biodiversity Portal)

MS, Aug.,2021/02 Ulmus sp. for id: 2 images.
Location : Laipuitlang, Mizoram
Date : 23-12-2019
Habit : Tree
Habitat : Wild

Are there any other species listed other than Ulmus parvifolia, to which it appears close ?

Only Ulmus lanceifolia is recorded in Mizoram

Yes, it is Ulmus lanceifolia only as per POWO and keys at Flora of China.



References: POWO  Catalogue of Life  The Plant List Ver.1.1  Tropicos  GBIF (High resolution specimens) Flora of China  Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  Wikipedia  Plant illustrations

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