jennifercrabtreedesign Love the lighting! Can you provide the source for the ceiling fixture?

carolryan Try Rejuvenation. They have one very similar.

sbandyk It's also possible to chemically treat Cherry to give it a darker, vintage look. Potassium Dichromate will darken cherry, but you don't want to accidentally take a swig from your application jar. it's used on furniture, safe when sealed.
Cherry also darkens when exposed to sunlight, I expect from the UV. You could leave the floor planks out in the sun for a bright, dry weekend or two.. though hopefully you don't have a lot of birds in the yard [course, clear plastic tarp will pass UV, but a glass is actually UV opaque so a glass sunroom .. not so much a great idea.
Oil, like boiled linseed will darken it a bit too but make sure you've let it cure before you apply your polyurethane. The poly won't dry right if you don't..

lindsaycr It looks like American Walnut- we have this exact flooring.