Andy Warhol's Flowers were based on a color photograph of hibiscus blossoms taken by Patricia Caulfield which appeared in the June 1964 issue of Modern Photography magazine. When Caulfield saw Warhol's Flowers, she brought a lawsuit against the artist and was offered two sets of Flowers portfolios as payment for use of her work, but she declined the offer and a cash settlement was arranged.
With this post I recommend the books:
Andy Warhol Treasures by Geralyn Huxley
Diane Von Furstenberg: The Wrap by André Leon Telly