Millefiore is a technique of applying small thin flowers to glass beads,
pendants, and other glass objects. This technique dates back to ancient
Greece, Rome, and Phoenicia. It was perfected by the Venetians in their
beadmaking beginning in the Middle Ages. The word millefiore means
thousands of flowers.
Harvard's Botanical Museum in the 19th Century commissioned Leopold and Rudolph Blaschka in Germany to make glass plants and flowers for the purpose of teaching botany. This collection was made during the period of 1887 to 1939. It remains today as a classic collection of glass plant models and is known for its exactness. In recent times the making of glass beads in the shape of flowers has become very much in style.
You can see examples at www.beadshaper.com/gallery?category.