This is the 10601st most frequent Russian word.
внучатая
"Внучатая" means "related to a granddaughter or grandson."
The word 'внучатая' is used as an adjective related to 'granddaughter' (внучка). Here, it describes a braid associated with, or metaphorically gestures towards, her granddaughter.
Она заботливо поправила внучатую косу, вспоминая детство.
She carefully adjusted her granddaughter's braid, remembering her childhood.
The word 'внучатый' is modified to describe something in the manner of, or suitable for, a level appealing to grandchildren.
Новое пособие было написано в стиле внучатого уровня, чтобы быть понятным детям.
The new manual was written in a granddaughterly level style to be understandable for children.
Here, 'внучатое' is an affectionate adjective applied to 'tree' to indicate a connection or importance related to her or someone's grandchildren.