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.
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It is a tropical woody-based perennial or sub shrub that grows 3 to 6 feet tall in its native habitat, but more typically to 1 to 2 feet tall in beds or containers in the Midwest.
Source : Common name: Egyptian star flower. (2013, February 16). Hawk Eye, The (Burlington, IA). Retrieved from http://search.ebscohost.com.db24.linccweb.org/login.aspx?direct=true&db=edsnbk&AN=144ADF6D304E4988&site=eds-live