Circassian walnut

 In her novel, The Golden Box, author Frances Crane refers to furniture that was "American walnut much carved and inlaid with the Circassian walnut." Even though I worked for a year in the furniture industry and we sold pieces of furniture with walnut laminate and stain on them, I do not recall the term "Circassian." The internet tells me that it is "a highly prized, slow-growing walnut species from the Caucasus region, renowned for its dense, fine-grained, and visually striking wood."