Here is the photo

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It looks like plain sawn oak.

The finish looks super silky though. Shellac would have been period appropriate, but at this age, it probably would start to be alligator-y so I am thinking it was refinished at some point. Also, the finish doesn't appear to have yellowed over time, which is common with polyurethane so maybe it was done recently. Or it's another product altogether.

Thanks! The finish is very smooth, and looking closer I realize it is somewhat shiny including in the dinged spots, which does seem to support the idea that it was refinished at some point.

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are there gaps around where it meets window/door/walls? It just looks so smooth to be brushed polyurethane and I wonder if the trim was taken off and sprayed with laquer. Or maybe my brush polyurethane skills are poor (ha!)

Gum wood?

Gum seems unlikely in New England, right?

There aren't many gaps between the trim pieces, or between them and the plaster walls, and I see no sigh that the trim was ever removed and reinstalled.

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The upstairs floors are some sort of softwood - maybe pine - that roughly matches the trim.

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Downstairs floors (not shown) are hardwood, probably oak, that does not match the trim grain as well.

Looks like fir which is common in older houses in MA.

No, not oak - Im not seeing the large pores. Looks like some kind of old growth pine or fir - sorryIm not good at identifying individual species but maybe you could find some local refinishers and find out what was commonly used around there.. 1915 they were still harvesting the old growth forests that once blanketed north america - nice tight grain, hard as nails, a beautiful wood. Im thinking only clear finish and no stain was used on it - that reddish color looks like the patina of 100 yr old wood after shellac has been removed (with denatured alcohol not harsh paint stripper) Its funny, at the time that old growth pine was considered cheap wood. NOw if you go to salvage yard its often the most expensive wood there

Your flooring looks like Douglas fir: most of it vertical grain.

It’s Gumwood I have the exact same in my home. the door trim is a replica.