Nymphea 'Bagdad,' 2006 by Leslie Berge, for the Brooklyn Botanic Garden.
A Florilegium is a collection of flora, most often garden flowers. The earliest known examples date to about the 15th century, but as you can see from this example, they continue to be produced in the present day. The Victorians were very fond of gardening and many Florilegia were produced in the 19th century.
The Florist and Pomologist. London: Journal of Horticulture Office, Bryn Mawr College Library Special Collections.