Sara Lee "Sally" Winkler, 79, a retired teacher who was a partner in the B. Winkler Florist greenhouses of Chevy Chase, died of congestive heart failure March 15 at Suburban Hospital. She lived in Chevy Chase.

Mrs. Winkler, a Pennsylvania native, was a 1946 Phi Beta Kappa chemistry graduate of the College of Wooster in Ohio.

She came to the Washington area in 1947 and was a National Bureau of Standards chemist until 1948.

From then until 1993, she was a partner in the floral and snapdragon breeding business with her husband and sister-in-law.

She taught mathematics at the Academy of the Washington Ballet from 1973 to 1976 and at the Holton-Arms School until she retired in 1985.

She also was a substitute teacher and tutor with the Montgomery County Public Schools.

Over the years, Mrs. Winkler served as an American Field Service selection committee coordinator at Bethesda-Chevy Chase High School and as president of the North Chevy Chase Elementary School PTA.

She was a Girl and Boy Scout troop leader and did volunteer work for Meals on Wheels.

She had been a member of Chevy Chase Presbyterian Church since 1948, and she sang in the church choir and taught Sunday school.

Survivors include her husband, Fred B. Winkler of Chevy Chase; two sons, Ken, of Amelia Island, Fla., and David, of Chevy Chase; two daughters, Dottie Phelps of Seattle and Lorrie Krautwurst of Chevy Chase; and nine grandchildren.