Acer caudatum Wall., Pl. Asiat. Rar. 2: 4 (1830) (syn: Acer caudatum var. erosum (Pax) Rehder ; Acer caudatum var. georgei Diels ; Acer caudatum subsp. georgei (Diels) A.E.Murray ; Acer caudatum var. multiserratum (Maxim.) Rehder ; Acer caudatum subsp. multiserratum (Maxim.) A.E.Murray ; Acer caudatum subsp. prattii (Rehder) A.E.Murray ; Acer caudatum var. prattii Rehder; Acer erosum Pax ; Acer multiserratum Maxim. ; Acer papilio King );
Himalaya to N. & E. Central China and N. Myanmar: Assam, China North-Central, China South-Central, China Southeast, East Himalaya, Inner Mongolia, Myanmar, Nepal, Tibet, West Himalaya as per POWO;

Tree to 10m. Leaves 5(-7) lobed, 10-15cm long and broad; lobes 4-6cm, caudate-acuminate; base cordate, margin coarsely doubly serrate, pale pubescent beneath especially on veins and towards base; petioles 3-10cm. Flowers in dense panicles. Sepals acute, 2-3mm. Petals ± as long as sepals. Anthers scarcely exserted. Mericarps ascending and narrowly divergent; wing 2-2.5 x 1 cm.
Fl. May-June
In mossy Fir forests.
(Attributions: A.J.C. GRIERSON & D.G. LONG. Flora of Bhutan. Published by RBGE. 1991 as per Bhutan Biodiversity Portal)

SK 3826 31 July 2023: 4 high res. images.

Location: Lugum, Rukum West, Nepal 
Date: 31 May 2023
Elevation: 3000 m.
Habit : Wild
Acer caudatum Wall. ??

Looks like Neillia thyrsiflora of family Rosaceae

I am not sure if it is the sp. as you have suggested since the inflorescence is single and erect not like multiple bunchs in Neillia thyrsiflora!

Yes, possible as per




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