Egyptian starcluster. 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 as well as Yemen. It is known for its wide use as a garden plant where it often accompanies butterfly gardens. Egyptian star cluster or star flower grows 3-6’ tall in its native habitat. It is a many-branched plant that features 4” wide rounded clusters of star-shaped flowers in red, pink, magenta, lilac or white.