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 );
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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;
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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)
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SK 3826 31 July 2023: 4 high res. images.
Habit : Wild
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
https://temperate.theferns.info/plant/Acer+caudatum
https://en.wikipedia.org/wiki/Acer_caudatum
http://www.efloras.org/object_page.aspx?object_id=110317&flora_id=2
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:781257-1
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References:
POWO Catalogue of Life Flora of China FOC illustration Annotated checklist of Flowering plants of Nepal India Flora Online Bhutan Biodiversity Portal India Biodiversity Portal Wikipedia Plant illustrations Useful Tropical Plants trees and shrubs online