20¢ Desert Plants - Pack of 25 unused stamps from 1981
32¢ Georgia O'Keeffe - Pack of 25 unused stamps from 1996
8¢ Wildlife Conservation - Pack of 25 unused stamps from 1972
6¢ Botanical Congress - Pack of 25 unused stamps from 1969
15¢ American Trees - Pack of 25 unused stamps from 1978
29¢ Spring Garden Flowers - Pack of 25 unused stamps from 1993
34¢ Carnivorous Plants - Pack of 25 unused stamps from 2001
32¢ Winter Garden Flowers - Pack of 25 unused stamps from 1996