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

/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-1-.JPG/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-3-.JPG/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-2-.JPG/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-8-.JPG/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-4-.JPG/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-5-.JPG/wp-content/uploads/2020/10/Aruncus%20dioicus%20ssp%20triternatus%20-6-.JPG

Aruncus dioicus ssp triternatus from Valley
pls validate

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.

A tree from Rosaceae.


POWO gives it as an accepted name.


.



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.

Madhmaheshar Valley (UK)
Id- Sunit Singh
alt- 3400m asl.


Oh sorry!

It seems Astilbe rubra


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


.