Aruncus dioicus subsp. triternatus

Aruncus dioicus subsp. triternatus (Wall. ex Maxim.) H.Hara, Fl. E. Himal. 2: 50 (1971) (syn: Aruncus sylvester var. triternatus Wall. ex Maxim.);
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East Himalaya, Nepal, West Himalaya as per POWO;

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Yes …, the accepted name is Aruncus sylvester Kostel. ex Maxim. hope you get it in flower next time.
I wish you also clicked Astilbe rivularis, a very similar looking member from Saxifragaceae but usually about 1 m tall or so.

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A tree from Rosaceae.

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POWO gives it as an accepted name.

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addition to images to Aruncus dioicus: 3 images.
please check the attached images of Aruncus dioicus, I’m not able to find crisp images of the same in efI.

Oh sorry!

I think appears close to images at
https://efloraofindia.com/2012/09/20/aruncus-dioicus-subsp-triternatus/

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References:
POWO  Catalogue of Life  Valley of flowers info  Wikimedia Commons  Checklist of Nepal  BSI Flora of India Himalaya Hikers