Lillian M. Meyer, 68, who belonged to national and area garden and flower societies, died Saturday at her Oxon Hill home after a heart attack.

She was a board member of the American Daffodil Society, and had been president of the Washington chapter.

Mrs. Meyer was a judge of chrysanthemums and a member of the Potomac Chrysanthemum Society.

Her other posts had included that of vice president of the National Capital Area Federation of Garden Clubs.

She had belonged to the Birchwood City, Oxon Hill, and Half-Acre garden clubs.

Mrs. Meyer had served as head of the volunteer guide service at the National Arboretum from 1969 to 1971.

She had been an instructor at the Department of Agriculture Graduate School for the past four years where she had taught courses in house plants.

For the past several years she had worked for the Prince George's County department of aging as a home visitor.

Mrs. Meyer was a native of Ashmore, Ill., and moved here in the early 1940s.

Survivors include her husband, LeRoy F. Meyer Sr., and a son, LeRoy F. Jr., both of the home; Two daughters, Barbara M. Conley and Myrna M. Wade, both of Friendly, Md; two sisters, Lois Brumleve, of Mattoon, Ill., and Phyllis B. Waters, of Clifton; a brother, Rovert Waters, of Portland, Ind., and six grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Friends of the National Arboretum.