Portugal's unofficial national flower, the Lavender, is a specie of the mint family, Lamiaceae. It is native to the Old World and is found from Cape Verde and the Canary Islands, southern Europe across to northern and eastern Africa, the Mediterranean, south west Asia to south east India. Lavenders are cultivated extensively in temperate climates as ornamental plants for garden and landscape use, and also commercially for the extraction of essential oils. Source : Wikipedia
Brazil's national flower, the Tabebuia alba flower (port. Ipê-amarelo-da-serra), is also commonly known as the Golden Trumpet Tree, Ipê (commonly misspelled "epay"), Poui and pau d'arco. Tabebuia is a notable flowering tree. The flowers are 3 to 11 cm (1 to 4 in.) wide and are produced in dense clusters
Netherlands "unofficial" national flower, the tulip, is a perennial, bulbous plant with showy flowers in the genus Tulipa, of which up to 109 species have been described and which belongs to the family Liliaceae. Today, Tulip festivals are held around the world, including in the Netherlands and Spalding, England. The Netherlands has the world's largest permanent display of tulips at Keukenhof.