Janice M. Larson, 86, of Memphis, died Sunday at Methodist University Hospital. She is preceded in death by her husband of 50 years, Ralph S. Larson. Mrs. Larson leaves a daughter, Julianne Larson of Cordova; two sons, Jay Larson of Memphis and David Larson of Houston, Texas; a sister, Judy Cleveland of Andover, Minn., and a grandson, David Larson, Jr. of Memphis.