‘NC-8’ (C. mollissima), also known as ‘Campbell NC-8’, is a second-generation OP seedling of ‘Skioka’, the reputed C. mollissima × C. sativa hybrid of J.U. Gellatly (Gellatly, 1964). Morphologically, ‘NC-8’ appears primarily C. mollissima; however, some traits suggest C. sativa and C. dentata are in its genetic background. Its growth is erect, and nuts ripen midseason within a short period. Burs often contain single nuts. The tree was selected by Doug Campbell in Ontario, Canada, for its large nuts, but the nut size is moderate to small (10–11 g) in Missouri. However, the nut size might increase in southern or western climates (Nave, 1998).