Mixed width black walnut. Here is a similar floor we just made for a client.

Definitely looks like natural walnut - no stain. We just did this floor. It is BEAUTIFUL!

What brand of flooring is this?

We made ours in our shop.

This kitchen features Venetian Gold Granite Counter tops, White Linen glazed custom cabinetry on the parameter and Gunstock stain on the island, the vent hood and around the stove. The Flooring is American Walnut in varying sizes. There is a natural stacked stone on as the backsplash under the hood with a travertine subway tile acting as the backsplash under the cabinetry. Two tones of wall paint were used in the kitchen. Oyster bar is found as well as Morning Fog.