A new and distinct cultivar of black walnut tree (Juglans nigra L.) which is distinctly characterized by extremely rapid growth rate, and excellent central stem tendency, thereby producing good timber qualities. This new variety of black walnut trees was discovered by the applicant near South Raub, Tippeconoe County, Ind. in a black walnut planting of seedling progeny from previously selected trees for outstanding timber production potential. This selection has been designated as BW509, a seedling progeny of BW 95 (unpatented) in records maintained by the applicant on the performance of this selection, and grafts made from the selection, and will be known henceforth as Beineke 12.