Pentas lanceolata, commonly known as Egyptian Starcluster, is a species of flowering plant in the madder family, Rubiaceae that is native to much of Africa. Flowers are colorful; red, purple, pink and white. It is known for its wide use as a garden plant where it attracts butterflies and humming birds and sun birds.
Photos: Flower Dome, Gardens by the Bay, Singapore, 20130316; Cecil B. Day Butterfly Center, Callaway Gardens, GA.