Beautiful pictures, Muthu.
As per Britannica and Columbia Encyclopedias, there are almost 4000 cultivars of about 100 species of the genus Tulipa are existing in cultivation.
And most of the cultivated Tulips are from
Tulipa gesneriana, it seems.
Shockingly, the streaks of various colours are caused due to infection of a harmless virus! Anyway they add more beauty to the beautiful flowers.
Vijayasankar Raman
National Center for Natural Products Research
University of Mississippi