The flowers are under a half inch wide and have six parts. The leaves are opposite and entire. The plant has a semi-upright, and semi-sprawling growth habit. They are growing in coastal North Carolina in sandy soil that is fairly dry. I don't know if it's native or if it's an introduced species. I will be grateful for any help.
Yeah. The Pentas flowers have five parts and these flowers have six.
See Richardia brasiliensis