Leaf lobation patterns of mulberry (Morus L.) shrubs and trees were studied in 1984 and 1985 at Bowling Green, Kentucky. The number of divisions (sinuses) were counted to a maximum of five per leaf. For adult trees, entire leaves were most frequent; single division leaves were second most frequent. For shrubs, entire leaves and leaves with four or five divisions occurred at approximately equal frequencies and at greater frequencies than the other classes. Leaf lobation distributions were significantly influenced by trees, years, and tree x year interactions. Linear correlation coefficients (r) between leaf position (numbered from tip of branch toward base) and number of lobes were positive and highly significant. Thus, leaf pattern became simpler with advanced stages of maturity.