The Japanese post issued the sixth series of Furusato stamps dedicated to Seasonal Flowers. Each of the series symbolized the four seasons of Japan. The current sixth series of stamps is based on the theme of flowers from early summer. The stamps depict Lily, Daylily, Lilac, Clematis and Skunk Cabbage.
Lily is a genus of herbaceous flowering plants growing from bulbs, all with large prominent flowers. Lilies are a group of flowering plants which are important in culture and literature in much of the world. Most species are native to the temperate northern hemisphere, though their range extends into the northern subtropics.
Daylily cultivar flowers are highly diverse in colour and form, as a result of hybridization efforts of gardening enthusiasts and professional horticulturalists. Daylilies are perennial plants. The flowers of most species open in early morning and wither during the following night, possibly replaced by another one on the same scape the next day. Some species are night-blooming. Daylilies are not commonly used as cut flowers for formal flower arranging, yet they make good cut flowers otherwise as new flowers continue to open on cut stems over several days.
Lilac is a genus of about 20–25 species of flowering woody plants, native to woodland and scrub from southeastern Europe to eastern Asia, and widely and commonly cultivated in temperate areas elsewhere. The flowers are produced in spring, each flower being 5 to 10 millimeters in diameter with a four-lobed corolla. The usual flower colour is a shade of purple (often a light purple or lilac), but white, pale yellow and pink, and even a dark burgundy color are also found. The flowers grow in large panicles, and in several species have a strong fragrance. Flowering varies between mid spring to early summer, depending on the species.