How old is the pine, and in what condition?

If it is really old (historic), I would be inclined to keep it.

If it is only 10 years old, I would be inclined to remove the pine.

Context is key.

Pics, please

Might the pine have been subfloor for linoleum? Lay down new Marmoleum.

At this moment, I only have pictures of the oak floors. The kitchen was just ripped out yesterday and the old ceramic tile was pulled up. The pine floors were revealed but still have some tar paper-like stuff in spots and are very rough with some knots. going to get a small area sanded tomorrow and you will see the pine better. the house is 80 years old and I believe all the wood flooring is that vintage. The oak in the rest of the house was recently sanded and finished with a natural light stain. The two floors will butt up together only for the width of a cased opening where a door used to be separating the kitchen from the dining room - about 32 inches wide. I did see a couple of patches of linoleum that must have been laid on top of the pine at some point.

I have been aware for many years that kitchen floors in 'vintage' houses were frequently made of a lesser wood such as pine and am not surprised that this house does as well. I will try to post photos after sanding is done. Interesting how the status of kitchens has done a 180 and now are arguably considered to be the most important room in the house!

Painting or whitewashing the floor might be an option if the pine is in poor condition. Does anyone have experience with this?

Thanks to all for your comments!

Unless you are pleased with really rustic (more cabin like) you aren't likly to make what started as sub floor look finished.

If you like the look of the pine once sanded i’d leave it - just a 32” area where it meets is fine. i’d replace with new oak over painting/whitewashing.

Often these weren't subfloors in exactly the modern sense- the subfloor is typically rough cut 2-12s run on the diagnol, then tar paper, then the t+g pine. While the pine often had knots it was flat and smooth to accept linoleum which was a magic new flooring.

@dweiner51, once you have a party with 80 people and they all want to be in the kitchen, you realize the kitchen is important. Seriously, that party was in our first house and barely anyone went into the dining room and family room ... I joked it was like those other rooms were taped off with "crime scene do not cross" yellow tape! I've become better at moving people out and have a bigger kitchen now, but majority still insist on hanging out in the kitchen.

MY guess sub floor as mentioned the pine was often used for sub floor. IMO all the same flooring is a much nicer look .

100 year old house with pine flooring in older portion and oak in 22 year old addition. Had them all sanded/refinished at the same time so the color is consistent.