Looks like one of the sumacs, but not Winged, Shining, or Smooth, I don’t think.

Definitely a Sorbus, aka mountain ash or rowan. Sorbus aucuparia is a virtual weed in my area and is on our invasive species watch list but there are a couple of native species present as well.

Sorbus aucuparia looks exactly correct! Thanks, much! I'm going to try collecting and planting some seeds if I can get them before the Cedar Waxwings arrive.

It does look generally like that species but certain pertinent specific features like those of the winter stem buds are not shown adequately in these views. And it has not been stated where the tree is located geographically, which also has a bearing on which particular species is possible. With there being about 135 species in the genus including sets of ones that resemble one another.

The tree is in NW Wisconsin. Zone 3-4. If there are other photos I could provide, please guide me as to what you'd like to see.

Here is the kind of thing that is involved with such pursuits:

Sorbus aucuparia is a commonly planted ornamental tree that is widely bird-disseminated. The species is often confused with S. decora, from which it differs by its ovoid and usually densely whitish-villous and nonglutinous winter buds and by its densely villous flowering pedicels and hypanthia. The leaflets of S. aucuparia are often tomentose abaxially at flowering; those of S. decora are glabrous or sparsely villous. Examination of leaflet serration is also useful; S. decora exhibits a prolonged apical tooth; it is no longer than the lateral ones in S. aucuparia. The lateral teeth are relatively finer and sharper in S. decora compared to those of S. aucuparia. At a magnification of at least 70× , leaflets of S. aucuparia are reportedly minutely papillose abaxially; those of S. decora are not papillose (H. A. McAllister 2005)

http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=220012689